Triaxial test of sliding zone soil with natural grain size composition in riverside slumping mass Ⅱ
LI Yunan
WANG Yuewei
Abstract：In order to study the effect of coarse particles on the strength of sliding zone soil,the sample with sand bores( diameter is 1 cm,space between sand bores is 7.5 cm) are perforated along axial direction.Then large-scale triaxial test equipment are used in consolidated-undrained shear test of sliding zone soil of natural grain size composition in TP4 adit in riverside slumping mass Ⅱ.To verify the test results,stability of riverside slumping mass Ⅱ is calculated separately with strength parameters of sliding zone soil with natural grain size composition and less than 2mm fine grain group.The results show that the cohesion of sliding zone soil is in-creased from 25 kPa to 90 kPa after increasing coarse particles and the internal friction angle is not changed significantly.Meanwhile,the slope stability coefficient is increased from 0.954 to 1.127 and the stability coeffi-cient of riverside slumping mass Ⅱ increased by 18.3%.The slope is changed from unstable state to stable state.Currently,riverside slumping mass Ⅱ is in stable state. For the sliding zone soil of riverside slumping mass Ⅱ,the influence of coarse particles in slope stability could not be ignored and coarse particles should not be eliminated in strength tests.
Keywords：natural grain size compositionsliding zone soillarge-scale triaxial testslope
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 130-135 )