首页|Analysis of strength characteristics of loess before and after freezing using a hollow cylinder torsional shear apparatus

Analysis of strength characteristics of loess before and after freezing using a hollow cylinder torsional shear apparatus

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This paper aims to comprehensively analyze the influence of the principal stress angle rotation and intermediate principal stress on loess's strength and deformation characteristics.A hollow cylinder torsional shear apparatus was utilized to conduct tests on remolded samples under both normal and frozen conditions to investigate the mechanical properties and deformation behavior of loess under complex stress conditions.The results indicate significant differences in the internal changes of soil particles,unfrozen water,and relative positions in soil samples under normal and frozen conditions,leading to noticeable variations in strength and strain development.In frozen state,loess experiences primarily compressive failure with a slow growth of cracks,while at normal temperature,it predominantly exhibits shear failure.With the increase in the principal stress angle,the defor-mation patterns of the soil samples under different conditions become essentially consistent,gradually tran-sitioning from compression to extension,accompanied by a reduction in axial strength.The gradual increase in the principal stress axis angle(α)reduces the strength of the generalized shear stress and shear strain curves.Under an increasing α,frozen soil exhibits strain-hardening characteristics,with the maximum shear strength occurring at α=45°.The intermediate principal stress coefficient(b)also significantly impacts the strength of frozen soil,with an increasing b resulting in a gradual decrease in generalized shear stress strength.This study provides a reference for comprehensively exploring the mechanical properties of soil under traffic load and a reliable theoretical basis for the design and maintenance of roadbeds.

LoessHollow cylinder torsional shear apparatusMajor principal stress angleIntermediate principal stress coefficient

Peng Shen、QingZhi Wang、JianHong Fang、ChenWei Wang、Kui Zhang

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School of Civil Engineering and Water Resources,Qinghai University,Xining,Qinghai 810016,China

Qinghai Scientific Research Observation Base,Key Laboratory of Highway Construction and Maintenance Technology in Permafrost Regions,Ministry of Transport,Xining Qinghai 810016,China

National Natural Science Foundation of ChinaNatural Science Foundation of Qinghai ProvinceYouth Research Foundation of Qinghai University

42161026 & 418010462023-ZJ-934M2022-QGY-5

2024

10.1016/j.rcar.2024.04.003

寒旱区科学(英文版)
中国科学院寒区旱区环境与工程研究所,科学出版社有限责任公司

寒旱区科学(英文版)

影响因子：0.237
ISSN：1674-3822
年,卷(期)：2024.16(2)
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