Detail of FD 003-2007

Introduction of FD 003-2007

1 Scope 1.0.1 This standard specifies such contents as the basic principles and methods for the design of subgrade and foundation for wind turbine generator system tower in wind power station, engineering geological conditions, environmental conditions, load, structural design, ground treatment, inspection and monitoring involving subgrade and foundation. 1.0.2 This standard is applicable to the design of subgrade and foundation for wind turbine generator system tower in newly-built onshore wind power station. Completion acceptance, reconstruction (extension) of existing project and periodical safety inspection shall be implemented by reference to this standard. 1.0.3 The design of subgrade and foundation for wind turbine generator system tower in wind power station shall comply with the requirements of this standard, subgrade of collapsible soil, permafrost and expansive soil and that in erosive environment or under temperature influence shall also meet those specified in relevant current national standards. 2 Normative References The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. GB 18306 Seismic Ground Motion Parameter Zonation Map of China GB 18451.1 Wind Turbine Generator Systems - Safety Requirements GB 50007 Code for Design of Building Foundation GB 50009 Load Code for the Design of Building Structures GB 50010 Code for Design of Concrete Structures GB 50011 Code for Seismic Design of Buildings GB 50021 Code for Investigation of Geotechnical Engineering GB 50046 Code for Anticorrosion Design of Industrial Constructions GB 50153 Unified Standard for Reliability Design of Engineering Structures GB 50223 Standard for Classification of Seismic Protection of Building Constructions GB 50287 Code for Hydropower Engineering Geological Investigation GBJ 146 Technique of Powdered Coal Ash Concrete Application FD 002-2007 Classification and Design Safety Standard of Windpower Projects DL/T 5082 Design Specifications of Hydraulic Structures against Ice and Freezing Action JB/T 10300 Wind Turbine Generator System - Design Requirements JGJ 24 Code for Design of Civil Architecture Thermal Engineering JGJ 94 Technical Code for Building Pile Foundations JGJ 106 Technical Code for Testing of Building Foundation Piles JTJ 275 Corrosion Prevention Technical Specifications for Concrete Structures of Marine Harbor Engineering 3 General Provisions 3.0.1 This standard is specially prepared in order to unify the content and depth of design of subgrade and foundation for wind turbine generator system tower in wind power station. 3.0.2 The subgrade and foundation for wind turbine generator system is designed through implementing national technical and economic policies, insisting principles of adaptation to local conditions, environmental protection and resource conservation, and fully considering the load-bearing characteristics of the structure, so as to be safe and applicable, economical and reasonable and technology-advanced. 3.0.3 Ultimate state design method is adopted for the design of subgrade and foundation in this standard, and the evaluation of load and relevant partial factor shall comply with relevant requirements so as to ensure the safe and normal operation of subgrade and foundation for wind turbine generator system under the specified external conditions, design conditions and load conditions within the 50-year design service life.

Contents of FD 003-2007

Foreword i 1 Scope 2 Normative References 3 General Provisions 4 Terms 5 Basic Requirements 6 Subgrade Properties 6.1 Rock-soil Classification 6.2 Engineering Property Indexes of Rock and Soil Mass 7 Load, Load Condition, Load Effect Combination and Partial Factor 7.1 Load 7.2 Load Condition and Load Effect Combination 7.3 Partial Factor 8 Subgrade Calculation 8.1 General 8.2 Calculation of Subgrade Bearing Capacity 8.3 Compression Calculation of Foundation 8.4 Deformation Calculation 8.5 Stability Calculation 9 Foundation Design 9.1 General 9.2 Spread Foundation 9.3 Pile Foundation 9.4 Rock Foundation with Anchor Bars 9.5 Requirements for Ordinary Construction 10 Ground Treatment 10.1 General Requirements 10.2 Soil-rock Composite Subgrade 10.3 Compacted Fill Subgrade 10.4 Karst and Rock Subgrade 10.5 Soft Subgrade 11 Inspection and Monitoring 11.1 Inspection 11.2 Monitoring Annex A Classification of Rock Hardness Degree and Rock Mass Integrity Degree Annex B Classification of Rock Mass Weathered Zone Annex C Classification of Rock Mass Structure Annex D Field Identification of Gravelly Soil Annex E Key Points of Shallow Plate Loading Test Annex F Standard Value ck and φk of Shear Strength Annex G Vibration Liquefaction Discrimination of Soils Annex H China Standard Frost Penetration Line Graph of Seasonally Frozen Soil Appendix J Additional Stress Factor α and Average Additional Stress Factor Annex K Tables for Empirical Values of Ultimate Shaft Resistance and Ultimate Tip Resistance for Pile Annex L Calculation of Pile Foundation under Horizontal Load Considering Cooperative Action of Pile Cap and Foundation Pile and Elastic Resistance Action of Soil Appendix M Calculation of Final Settlement Value of Pile Foundation Explanation of Provisions