Detail of TB 10115-2014

Introduction of TB 10115-2014

Code for rock test of railway engineering 1 General 1.0.1 This code is formulated to unify the methods and technical requirements for rock test of railway engineering so as to provide reliable parameters for engineering design and construction. 1.0.2 This code is applicable to the rock tests of new-built and renovated railway in survey, design and construction stages. 1.0.3 The test contents, test methods and technical conditions of this code shall meet the basic requirements and characteristics of railway engineering survey, design and construction. 1.0.4 Apparatuses used for the tests in this code shall be verified, calibrated or checked as required. 1.0.5 The test work of this code shall comply with the laws and regulations of the state, local authorities and relevant departments on environmental protection, safety production, energy conservation and emission reduction, and ensure the safety of operators and apparatuses. 1.0.6 In addition to this code, the rock test of railway engineering shall also conform to the relevant mandatory standards of the state. 2 Terms and symbols 2.1 Terms 2.1.1 rock mineral aggregate combined in a certain way due to various geological actions, which is the main material forming the crust and mantle 2.1.2 rock mass rigid geologic body composed of various structural planes and structures cut by the planes, existing in specific geological environment 2.1.3 bed rock large tracts of rock mass buried under natural soil layer and exposed to the surface 2.1.4 rock sample unprocessed rock sample 2.1.5 core of rock rock pillar extracted from borehole 2.1.6 specimen rock sample processed according to the test purpose 2.1.7 test piece rock sample of a certain shape processed according to the test purpose 2.1.8 benchmarked test piece test piece with dimension of 50mm and shape factor of 1, used in point loading test of rock 2.1.9 measuring bottle measuring container with a certain standard volume 2.1.10 particle density of rock ratio of the rock solid mass to its volume 2.1.11 block density of rock ratio of the mass of rock test piece to its volume 2.1.12 sealing method general name of wax sealing method or polymer resin method, which is used to measure the particle density 2.2 Symbols A——the area of test piece c——the cohesion d——the particle size D——the diameter or side length of test piece E——the elastic modulus Ef——the elastic modulus of bearing plate E0——the deformation modulus H(h)——the height (thickness) of test piece Id——the slake durability index Is——the un-corrected point loading strength index Is（50)——the corrected point loading strength index Ia(50)——the anisotropy index of point loading strength K——the calculation coefficient of particle size Kw——the water-saturation coefficient Kf——the freeze-thaw coefficient Kp——the softening coefficient Lf——the freeze-thaw mass loss rate m——the mass of test piece (or specimen) n——the porosity P——the failure load of test piece Pb——the fracture pressure in the rock mass Ph——the hydrostatic pressure P0——the pore pressure in the rock mass Pr——the re-opening pressure in the rock mass Ps——the instantaneous closing pressure Pp——the swelling pressure R——the uniaxial compressive strength SH——the maximum plane principal stress Sh——the minimum plane principal stress Sv——the principal stress in drilling direction V——the volume VH——the axial free swelling ratio VD——the radial free swelling ratio VHP——the lateral restraint swelling ratio Vp——the velocity of P-wave Vs——the velocity of S-wave ω——the water content ωa——the water absorptivity ωsa——the saturated water absorptivity W——the surface deformation of rock mass WA——the absolute deformation at deformation measuring point A WR——the relative deformation between two points Wz——the rock mass deformation at depth z Wf——the Poisson ratio of bearing plate △d——the radial deformation of borehole △R——the surface deformation of rock mass ε——the strain μ——the Poisson ratio. ρ——the block density of rock ρd——the dry density ρs——the particle density of rock ρsa——the block saturation density ρn——the density of sealing material ρw——the water density at 4℃ ρwT——-the density of test solution at T℃ σ——the normal stress σ1——the triaxial axial stress σ3——the triaxial lateral stress σt——the tensile strength τ——the shear stress φ——the internal friction angle 3 Basic requirements 3.0.1 The rock test work shall be determined according to the requirements of power of attorney or contract for rock test. 3.0.2 Rock sampling shall meet the actual engineering requirements and be conducted by such methods as drilling, adit excavation, trenching and shafting. In addition, it shall meet the following requirements: 1 rock samples shall not be taken by blasting method; 2 geologically representative core of rock or rock block is taken. 3 the lithology of rock samples in the same group shall be basically the same; 4 rock samples needing to keep natural water-bearing state shall be provided with sealing measures to prevent water evaporation or intrusion; 5 rock samples shall be stored in a cool place with little temperature change; 6 for stratified rock samples, the occurrence and orientation of rock samples shall be indicated; for anisotropic rock samples, the direction shall be considered. 3.0.3 The acceptance of rock samples shall mainly include the following: check whether the rock samples are intact, sealed in good condition and sufficient in quantity; check whether the labels of rock samples are consistent with the contents of the sample delivery sheet; register the numbers of rock samples one by one in an eye-catching way. The accepted rock samples shall be stored in a dry, cool sample room with little temperature difference.

Contents of TB 10115-2014

Foreword i 1 General 2 Terms and symbols 2.1 Terms 2.2 Symbols 3 Basic requirements 4 Thin section examination of rock 5 Test for determining the water content of rock 6 Test for determining the particle density of rock 6.1 Measuring bottle method 6.2 Le's measuring bottle method 7 Test for determining the block density of rock 7.1 Volume measuring method 7.2 In-water weighing method 7.3 Sealing method 8 Test for determining the water absorption of rock 9 Test for determining the swelling property of rock 9.1 Test for determining the free swelling ratio of rock 9.2 Test for determining the lateral restraint swelling ratio of rock 9.3 Test for determining the swelling pressure of rock 10 Test for determining the slake durability of rock 11 Determination of clay content in rock 12 Test for determining the frost resistivity of rock 13 Test for determining the uniaxial compressive strength of rock 14 Test for determining the uniaxial compressive deformation of rock 14.1 Resistance strain gauge method 14.2 Dial indicator method 15 Test for determining the tensile strength of rock 16 Test for determining the shearing strength of rock 17 Test for determining the shear strength of rock 18 Test for determining the triaxial compressive strength of rock 19 Test for determining the point load strength of rock 20 Test for determining the acoustic wave of rock 20.1 Test for determining the acoustic velocity of rock block 20.2 Test for determining the acoustic velocity of rock mass 21 Test for determining the deformation of rock mass 21.1 Test with bearing plate method 21.2 Test with slit method 21.3 Test with borehole deformation gauge method 22 Test for determining the stress of rock mass 22.1 Test with hole wall strain method 22.2 Test with aperture deformation method 22.3 Test with hole bottom strain method 22.4 Test with hydraulic fracturing method 23 Test for determining the strength of rock mass 23.1 Direct shear test on the rock mass structural plane 23.2 Direct shear test on rock mass Annex A Determination of the density of kerosene Annex B Correction of hydrometer and its related calculation parameters B.1 Correction of hydrometer B.2 Related calculation parameters Annex C Conversion of point load test results and correction of point load meter C.1 Conversion from point load test results to conventional rock strength index C.2 Calibration of point load meter Annex D Filing of measured data from rock mass stress test with overcoring stress relief method D.1 Requirements for coordinate system and serial number of measuring elements D.2 Observed value equation D.3 Calculation equation of stress component of rock mass D.4 Equation for calculating the magnitude and direction of principal stress of rock mass Explanation of wording in this code