Investigation on the Deformation and Failure Patterns of Loess Cut Slope Based on the Unsaturated Triaxial Test in Yan'an,China

作     者：Lina Ma Shengwen Qi Songfeng Guo Qiangbing Huang Xiaokun Hou Lina Ma;Shengwen Qi;Songfeng Guo;Qiangbing Huang;Xiaokun Hou

作者机构：Key Laboratory of Shale Gas and GeoengineeringInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Earth ScienceChinese Academy of SciencesBeijing 100029China Department of Geological EngineeringChang'an UniversityXi'an 710054China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2024年第35卷第1期

页      面：235-247页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0708[理学-地球物理学] 0814[工学-土木工程] 

基　　金：funded by the Natural Science Foundation of China(Nos.41790442 and 41825018) the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA23090402) the State Key Research Development Program of China(No.2017YFD0800501) 

主　　题：loess slope slope stability failure patterns deformation 

摘      要：The large-scale implementation of the Gully Stabilization and Land Reclamation(GSLR)project induces various failures of loess slopes due to excavation in Yan an,***,the deformation and failure behavior of these excavated loess slopes have not been fully *** this study,field investigation was undertaken for analyzing the distributions and failure features of excavation-induced loess slope *** is found that plastic failure mainly occurs in Q_(3) loess layers and brittle failure in Q_(2).To understand the underlying failure mechanism,a series of triaxial shear tests were conducted on intact Q_(3) and Q_(2) loess samples that with different water contents,namely natural water content(natural),dry side of the natural value(drying 5%),and wet side(wetting 5%).The characteristics of stress-strain curves and failure modes of the samples were *** show that the stress-strain curves of Q_(2) samples are dominated by strain-softening characteristics,while Q_(3) samples mainly exhibit strain-harden features except in the drying ***,shear failures of Q_(3) specimens are mainly caused by shear crack planes(single,X or V-shaped).For Q_(2) loess,the dominance of tensile cracks is observed on the surface of damaged *** disclose the different failure modes of excavated slopes located in different strata,that is,the arc sliding failure of Q_(3) loess slopes and the stepped tensile failure of Q_(2) loess slopes,and are helpful in the design and management of the ongoing GSLR projects in the Loess Plateau.