1.0.1 This code is formulated with the view to meet the requirements of design of ground base and foundation of highway bridges and culverts, so as to make the design keep state-of-art technology, economy and rationality, safety and usability, as well as environment protection.
1.0.2 This code is applicable to design of ground base and foundation of highway bridges and culverts. It also can be used as reference of design of other roadway bridge and culvert.
1.0.3 Design of ground base and foundation must adjust to local conditions, use local materials and save resources.
Type of foundation shall reasonably select according to hydrographic and geologic conditions, terrain, load, materials, and upper and lower structure form and execution conditions.
1.0.4 Engineering geology investigation shall be carried out at the bridge site. The investigation data shall be able to reflect specific information such as terrain, geomorphy, and stratal configuration, poor geologic conditions that may affect stability of bridge and culvert, physical mechanic properties of rock and soil and groundwater occurrence.
1.0.5 Action and effect combination of design of foundation structure shall be adopted according to the following provisions:
1 According to requirements of limit state of bearing capacity, basic combination and accidental combination of action effects shall be adopted for checking calculation of bearing capacity and stability of structural element.
1) Fundamental combination:
When carry out checking calculation for bearing capacity, the expression of action effect, importance factor of the structure, partial factor of each effect and combination factor of effects shall be carried out according to item 1 of article 4.1.6 of "General Specifications for Design of Highway Bridges and Culverts" (JTG D60-2004). When carry out checking calculation for the stability, all of the above factors shall be 1.0.
2) Accidental combination (excluding the earthquake effect):
Action effect combination may adopt the following formula:
(1.0.5)
Where,
γ0 - Importance factor of structure, γ0=1.0;
Sad - Effect combination value of action's accidental combination in the limit state of bearing capacity;
SGik - Normal value effect of the ith permanent action;
Sak - Normal value effect of accidental action;
SQlk - Normal value effect of the first changeable action besides accidental action; the normal value effect is larger than any other normal value effect of the jth changeable action;
SQjk - Normal value effect of the jth changeable action;
ψ11 - Frequent value factor of the first changeable action shall be taken according to item 1 of article 4.1.7 of "General Specifications for Design of Highway Bridges and Culverts"(JTG D60-2004); when carry out checking calculation for stability, ψ11 =1.0;
ψ2j - Quasi-permanent value factor of the jth changeable action shall be adopted according to those specified in item 2 of article 4.1.7 of "General Specifications for Design of Highway Bridges and Culverts";
, - Partial factor of corresponding action effect in the above expression shall be 1.0.
2 When the foundation structure requires design of normal limited state, the expression, frequent value factor and quasi-permanent value factor of combination for short-term action effects and those of combination for long-term action effects shall be determined according to article 4.1.7 of "General Specifications for Design of Highway Bridges and Culverts" (JTG D60-2004).
1.0.6 Checking calculation for stability of the foundation may be calculated according to the formula:
(1.0.6)
Where,
- Importance factor of the structure, =1.0;
Ssk - The combination value of normal value effect of the action which makes foundation structure unstable shall be calculated with the minimum combination value between fundamental combination and accidental combination;
Sbk - The combination value of normal value effect which makes the foundation structure stable shall be calculated with the minimal combination value between fundamental combination and accidental combination;
k - Stability factor of the foundation structure.
1.0.7 Design of durability shall be carried out for foundation structure.
1.0.8 When carry out checking calculation for vertical bearing capacity of subgrade, the action effect transferred to foundation base or cushion cap subface shall be the combination of short-term action effects in normal limited state; at the same time, accidental combination (excluding earthquake effect) of action effect also shall be considered.
Combination value of action effect shall be less than or equal to relevant allowable value of resisting force-subgrade bearing capacity or the allowable value of individual-pile bearing capacity.
1 When combination for short-term action effects is adopted, frequent value factor of changeable action shall be 1.0, and load of automobile shall be counted in impact factor.
Filling thickness (including depth of pavement) is equal to or larger than those arch bridge, culvert, and gravity type pier of 0.5m; automobile impact factor may be not counted in the calculation for subgrade.
2 When accidental combination of action effect is adopted, expression of the combination shall be adopted according to article 1.0.5 of this code, but without regard to importance factor of structure; partial factor of an action as showed in formula (1.0.5), frequent value factor and quasi-permanent value factor shall be 1.0.
1.0.9 When calculate foundation settlement, the action effect transferred to foundation base shall be adopted according to long-term action effect combination in normal limited state.
Such a combination is the effect caused by the permanent action normal value which is directly act on structure (excluding concrete shrinkage, creep action and action of foundation) and quasi-permanent value of changeable action (only refers to automobile load and crowd load).
1.0.10 Action value, effects combination, and value of related factors shall be taken according to current "General Specifications for Design of Highway Bridges and Culverts" (JTG D60), except that they are specially pointed. Calculation of foundation structure shall comply with current standards like "Code for Design of Highway Masonry Bridges and Culverts" (JTG D61) and "Code for design of reinforced concrete and prestressed concrete highway bridges and culverts (JTG D62). Aseismic design for subgrade foundation shall comply with those specified in "Specifications of Earthquake Resistant Design for Highway".
1.0.11 Design of subgrade and foundation of highway bridges and culverts shall not only comply with this code, but also comply with those specified in current national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Subgrade; foundation soil
It is referred to soil body and rock body bearing the structural action.
2.1.2 Foundation
It is referred to a part of structure, which transfers all kinds of actions bear by structure to the subgrade.
2.1.3 Safe classes
It is referred to design classes classified according to severity of damage caused by broken engineering structure, which is used to endow the structure with rational safety.
2.1.4 Combination for short-term action effects
It is referred to the combination effects between standard value of permanent action and frequent value of changeable action. In which, frequent value of changeable action is the product of changeable action standard value and frequent value factor.
2.1.5 Combination for long-term action effect
It is referred to the combination effects between standard value of permanent action and permanent value of changeable action when design in the normal limited state. In which, quasi-permanent value of changeable action is the product of changeable action normal value and quasi-permanent value factor.
2.1.6 Allowable value of bearing capacity
It is referred to the pressure corresponding to a deformation in the linear deformation section of the pressure deformation curve of subgrade.
2.1.7 Joint
It is referred to crack or crevice of terrane without apparent displacement at both sides of the rock body's fracture plane.
2.1.8 Bearing stratum
It is referred to the stratum directly bear the action of foundation.
2.1.9 Underlying stratum
It is referred to the soil stratum under bearing stratum, which locates in the depth of layer may be compressed or damaged.
2.1.10 Gravimetric density (it is named density for short)
It is referred to the gravity bear by unit volume of rock and soil, which is the product of the rock and soil density and the acceleration of gravity.
2.1.11 Seasonal frozen soil
It is referred to the soil stratum freeze up in winter and fully thaws out in spring (summer).
2.1.12 Permafrost
It is referred to the soil stratum keeping frozen state for more than two years.
2.1.13 Pile foundation
It is referred to the foundation composed of pile and cushion cap or collar beam connects with pile top.
2.1.14 Negative friction
It is referred to the downward friction of soil acts on the pile's lateral surface when the settlement larger than pile body occurs around the pile body, which is caused by self consolidation, self settlement by soaking and additional load of ground.
Contents 1 General Provision 2 Terms and symbols 2.1 Terms 2.2 Major symbols 3 Classification of subgrade rock and soil, engineering features and bearing capacity of subgrade 3.1 Classification of subgrade rock and soil 3.2 Indices of Engineering Properties 3.3 Bearing capacity of subgrade 4 Foundation calculation and subgrade treatment 4.1 Embedded depth of foundation 4.2 Subgrade and Foundation Calculation 4.3 Calculation of foundation settlement 4.4 Calculation of the foundation stability 4.5 Soft soil or weak subgrade treatment 4.6 Treatment of collapsible loess subgrade 5 Pile Foundations 5.1 General Provisions 5.2 Structure 5.3 Calculation 6 Open caisson foundation 6.1 General Provisions 6.2 Structure 6.3 Calculation 7 Underground diaphragm walls 7.1 General Provisions 7.2 Design of the supporting structure 7.3 Foundation Design Annex A Rock and soil classification of bridge and culvert subgrade Annex B Key points on test of saturated uniaxial compressive strength of rock Annex C Correction of the blow count of dynamic penetration Annex D Key points on shallow plate loading test Annex E Key points on deep plate loading test Annex F Key points on loading test of rock foundation Annex G Standard values of the shearing strength indices ck and Annex H Line graph for standard frost penetration of seasonal frozen soil in China and the classification of frost-heaving ability Annex J Calculation of additional vertical stress of abutment back roadbed filling on the abutment base or on pile tip surface Annex K Calculation for stress redistribution of two-way eccentrically compressed rectangular section and eccentrically compressed round section of the rock foundation Annex L Checking calculation on stability against frozen uplift of the frozen soil foundation Annex M Coefficient of additional compressive stress on bridge and culvert foundation base , coefficient of average additional compressive stress Annex N Key parameters of post-mudjacking Annex P Horizontal displacement and action effects of elastic pile calculated with m method Annex Q Calculation method for displacement and action effects of rigid pile Annex R Calculation for pile group used as integral foundation Annex S Calculation for supporting structure of straight diaphragm wall Annex T Calculation for supporting structure of round diaphragm wall
Standard
JTG D63-2007 Code for Design of Ground Base and Foundation of Highway Bridges and Culverts (English Version)
Standard No.
JTG D63-2007
Status
superseded
Language
English
File Format
PDF
Word Count
40000 words
Price(USD)
300.0
Implemented on
2007-12-1
Delivery
via email in 1 business day
Detail of JTG D63-2007
Standard No.
JTG D63-2007
English Name
Code for Design of Ground Base and Foundation of Highway Bridges and Culverts
1 General Provision
1.0.1 This code is formulated with the view to meet the requirements of design of ground base and foundation of highway bridges and culverts, so as to make the design keep state-of-art technology, economy and rationality, safety and usability, as well as environment protection.
1.0.2 This code is applicable to design of ground base and foundation of highway bridges and culverts. It also can be used as reference of design of other roadway bridge and culvert.
1.0.3 Design of ground base and foundation must adjust to local conditions, use local materials and save resources.
Type of foundation shall reasonably select according to hydrographic and geologic conditions, terrain, load, materials, and upper and lower structure form and execution conditions.
1.0.4 Engineering geology investigation shall be carried out at the bridge site. The investigation data shall be able to reflect specific information such as terrain, geomorphy, and stratal configuration, poor geologic conditions that may affect stability of bridge and culvert, physical mechanic properties of rock and soil and groundwater occurrence.
1.0.5 Action and effect combination of design of foundation structure shall be adopted according to the following provisions:
1 According to requirements of limit state of bearing capacity, basic combination and accidental combination of action effects shall be adopted for checking calculation of bearing capacity and stability of structural element.
1) Fundamental combination:
When carry out checking calculation for bearing capacity, the expression of action effect, importance factor of the structure, partial factor of each effect and combination factor of effects shall be carried out according to item 1 of article 4.1.6 of "General Specifications for Design of Highway Bridges and Culverts" (JTG D60-2004). When carry out checking calculation for the stability, all of the above factors shall be 1.0.
2) Accidental combination (excluding the earthquake effect):
Action effect combination may adopt the following formula:
(1.0.5)
Where,
γ0 - Importance factor of structure, γ0=1.0;
Sad - Effect combination value of action's accidental combination in the limit state of bearing capacity;
SGik - Normal value effect of the ith permanent action;
Sak - Normal value effect of accidental action;
SQlk - Normal value effect of the first changeable action besides accidental action; the normal value effect is larger than any other normal value effect of the jth changeable action;
SQjk - Normal value effect of the jth changeable action;
ψ11 - Frequent value factor of the first changeable action shall be taken according to item 1 of article 4.1.7 of "General Specifications for Design of Highway Bridges and Culverts"(JTG D60-2004); when carry out checking calculation for stability, ψ11 =1.0;
ψ2j - Quasi-permanent value factor of the jth changeable action shall be adopted according to those specified in item 2 of article 4.1.7 of "General Specifications for Design of Highway Bridges and Culverts";
, - Partial factor of corresponding action effect in the above expression shall be 1.0.
2 When the foundation structure requires design of normal limited state, the expression, frequent value factor and quasi-permanent value factor of combination for short-term action effects and those of combination for long-term action effects shall be determined according to article 4.1.7 of "General Specifications for Design of Highway Bridges and Culverts" (JTG D60-2004).
1.0.6 Checking calculation for stability of the foundation may be calculated according to the formula:
(1.0.6)
Where,
- Importance factor of the structure, =1.0;
Ssk - The combination value of normal value effect of the action which makes foundation structure unstable shall be calculated with the minimum combination value between fundamental combination and accidental combination;
Sbk - The combination value of normal value effect which makes the foundation structure stable shall be calculated with the minimal combination value between fundamental combination and accidental combination;
k - Stability factor of the foundation structure.
1.0.7 Design of durability shall be carried out for foundation structure.
1.0.8 When carry out checking calculation for vertical bearing capacity of subgrade, the action effect transferred to foundation base or cushion cap subface shall be the combination of short-term action effects in normal limited state; at the same time, accidental combination (excluding earthquake effect) of action effect also shall be considered.
Combination value of action effect shall be less than or equal to relevant allowable value of resisting force-subgrade bearing capacity or the allowable value of individual-pile bearing capacity.
1 When combination for short-term action effects is adopted, frequent value factor of changeable action shall be 1.0, and load of automobile shall be counted in impact factor.
Filling thickness (including depth of pavement) is equal to or larger than those arch bridge, culvert, and gravity type pier of 0.5m; automobile impact factor may be not counted in the calculation for subgrade.
2 When accidental combination of action effect is adopted, expression of the combination shall be adopted according to article 1.0.5 of this code, but without regard to importance factor of structure; partial factor of an action as showed in formula (1.0.5), frequent value factor and quasi-permanent value factor shall be 1.0.
1.0.9 When calculate foundation settlement, the action effect transferred to foundation base shall be adopted according to long-term action effect combination in normal limited state.
Such a combination is the effect caused by the permanent action normal value which is directly act on structure (excluding concrete shrinkage, creep action and action of foundation) and quasi-permanent value of changeable action (only refers to automobile load and crowd load).
1.0.10 Action value, effects combination, and value of related factors shall be taken according to current "General Specifications for Design of Highway Bridges and Culverts" (JTG D60), except that they are specially pointed. Calculation of foundation structure shall comply with current standards like "Code for Design of Highway Masonry Bridges and Culverts" (JTG D61) and "Code for design of reinforced concrete and prestressed concrete highway bridges and culverts (JTG D62). Aseismic design for subgrade foundation shall comply with those specified in "Specifications of Earthquake Resistant Design for Highway".
1.0.11 Design of subgrade and foundation of highway bridges and culverts shall not only comply with this code, but also comply with those specified in current national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Subgrade; foundation soil
It is referred to soil body and rock body bearing the structural action.
2.1.2 Foundation
It is referred to a part of structure, which transfers all kinds of actions bear by structure to the subgrade.
2.1.3 Safe classes
It is referred to design classes classified according to severity of damage caused by broken engineering structure, which is used to endow the structure with rational safety.
2.1.4 Combination for short-term action effects
It is referred to the combination effects between standard value of permanent action and frequent value of changeable action. In which, frequent value of changeable action is the product of changeable action standard value and frequent value factor.
2.1.5 Combination for long-term action effect
It is referred to the combination effects between standard value of permanent action and permanent value of changeable action when design in the normal limited state. In which, quasi-permanent value of changeable action is the product of changeable action normal value and quasi-permanent value factor.
2.1.6 Allowable value of bearing capacity
It is referred to the pressure corresponding to a deformation in the linear deformation section of the pressure deformation curve of subgrade.
2.1.7 Joint
It is referred to crack or crevice of terrane without apparent displacement at both sides of the rock body's fracture plane.
2.1.8 Bearing stratum
It is referred to the stratum directly bear the action of foundation.
2.1.9 Underlying stratum
It is referred to the soil stratum under bearing stratum, which locates in the depth of layer may be compressed or damaged.
2.1.10 Gravimetric density (it is named density for short)
It is referred to the gravity bear by unit volume of rock and soil, which is the product of the rock and soil density and the acceleration of gravity.
2.1.11 Seasonal frozen soil
It is referred to the soil stratum freeze up in winter and fully thaws out in spring (summer).
2.1.12 Permafrost
It is referred to the soil stratum keeping frozen state for more than two years.
2.1.13 Pile foundation
It is referred to the foundation composed of pile and cushion cap or collar beam connects with pile top.
2.1.14 Negative friction
It is referred to the downward friction of soil acts on the pile's lateral surface when the settlement larger than pile body occurs around the pile body, which is caused by self consolidation, self settlement by soaking and additional load of ground.
Contents of JTG D63-2007
Contents
1 General Provision
2 Terms and symbols
2.1 Terms
2.2 Major symbols
3 Classification of subgrade rock and soil, engineering features and bearing capacity of subgrade
3.1 Classification of subgrade rock and soil
3.2 Indices of Engineering Properties
3.3 Bearing capacity of subgrade
4 Foundation calculation and subgrade treatment
4.1 Embedded depth of foundation
4.2 Subgrade and Foundation Calculation
4.3 Calculation of foundation settlement
4.4 Calculation of the foundation stability
4.5 Soft soil or weak subgrade treatment
4.6 Treatment of collapsible loess subgrade
5 Pile Foundations
5.1 General Provisions
5.2 Structure
5.3 Calculation
6 Open caisson foundation
6.1 General Provisions
6.2 Structure
6.3 Calculation
7 Underground diaphragm walls
7.1 General Provisions
7.2 Design of the supporting structure
7.3 Foundation Design
Annex A Rock and soil classification of bridge and culvert subgrade
Annex B Key points on test of saturated uniaxial compressive strength of rock
Annex C Correction of the blow count of dynamic penetration
Annex D Key points on shallow plate loading test
Annex E Key points on deep plate loading test
Annex F Key points on loading test of rock foundation
Annex G Standard values of the shearing strength indices ck and
Annex H Line graph for standard frost penetration of seasonal frozen soil in China and the classification of frost-heaving ability
Annex J Calculation of additional vertical stress of abutment back roadbed filling on the abutment base or on pile tip surface
Annex K Calculation for stress redistribution of two-way eccentrically compressed rectangular section and eccentrically compressed round section of the rock foundation
Annex L Checking calculation on stability against frozen uplift of the frozen soil foundation
Annex M Coefficient of additional compressive stress on bridge and culvert foundation base , coefficient of average additional compressive stress
Annex N Key parameters of post-mudjacking
Annex P Horizontal displacement and action effects of elastic pile calculated with m method
Annex Q Calculation method for displacement and action effects of rigid pile
Annex R Calculation for pile group used as integral foundation
Annex S Calculation for supporting structure of straight diaphragm wall
Annex T Calculation for supporting structure of round diaphragm wall
