铁道科学与工程学报2025，Vol.22Issue(2)：863-874,12.DOI:10.19713/j.cnki.43-1423/u.T20240586
原状黄土和水泥土损伤比强度理论及地表黄土塑性流动深度预测
Damage ratio strength theory of undisturbed loess and cemented soil and prediction of plastic flow depth of surface loess
摘要
Abstract
The damage ratio strength theory has been applied to various types of cohesive-frictional materials,including concrete and isotropic rocks,providing reliable predictive results.Loess,which exists widely in nature,and cemented soil,a type of artificially treated soil consisting of cement treated soil and cement stabilized soil,both belong to cohesive-frictional materials.In this paper,the damage ratio strength theory was applied to predict the triaxial strength of undisturbed loess and cemented soil.First,based on the characteristics of the triaxial compression strength envelope and existing experimental data of undisturbed loess and cemented soil,a damage ratio strength theory for undisturbed loess and cemented soil was established.Five empirical coefficients for the damage ratio expression were recommended,and the predicted results of this theory were in good agreement with the triaxial strength data of different types of undisturbed loess and cemented soil.Then,a comparative analysis with Mohr-Coulomb single-shear criterion,twin-shear criterion,Lade criterion,and generalized SMP strength criterion demonstrated the higher computational accuracy of the proposed strength theory.Moreover,it was indicated that the damage ratio strength theory reflects the intersection of meridians with the hydrostatic pressure axis,whereas other criteria correspond opening meridians.Finally,based on the damage ratio strength theory with five empirical coefficients,it is possible to predict that loess and cemented soil exhibit three states:elastic-brittle,elastic-plastic,and plastic flow.This theory quantifies the indicators of uniaxial compressive crushing and triaxial compressive plastic flow for such soil types,and reveals the transition from elastoplasticity to plastic flow under high mean principal stress for soil materials,which provide a theoretical basis for the uneven settlement caused by the failure of foundation bearing stratum.The plastic flow depth of loess in deep surface due to gravity can be predicted according to the damage ratio strength theory of undisturbed loess.The predicted results are 75 m and 367 m respectively.关键词
原状黄土/水泥土/强度理论/损伤比/塑性流动Key words
undisturbed loess/cemented soil/strength theory/damage ratio/plastic flow分类
土木建筑引用本文复制引用
吴霞,丁发兴,王宁..原状黄土和水泥土损伤比强度理论及地表黄土塑性流动深度预测[J].铁道科学与工程学报,2025,22(2):863-874,12.基金项目
国家自然科学基金资助项目(51978664) （51978664）
中南大学中央高校基本科研业务费专项资金资助项目(2022ZZTS0603) （2022ZZTS0603）
中南大学高性能计算平台资助项目 （）
