|Table of Contents|

Influencing Factors on the Shear Strength of Sliding Zone of Loess-Hipparion Red Clay Landslide(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第04期
Page:
744-759
Research Field:
工程地质
Publishing date:

Info

Title:
Influencing Factors on the Shear Strength of Sliding Zone of Loess-Hipparion Red Clay Landslide
Author(s):
ZHU Yan-bo;  HAN Yu-tao;  MIAO Shuai-sheng;  LI Hong-fei;  LI Wen-jie;  LAN Heng-xing
(School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
loess;  Hipparion red clay;  landslide;  interface angle;  moisture;  density;  shear dilatancy characteristic;  shear strength
PACS:
P642.3
DOI:
10.19814/j.jese.2021.05024
Abstract:
Loess is widely deposited on Hipparion red clay forming weak interfaces, which controls the formation of loess landslide in Northwest China. In order to investigate the influ-ences of interface angle, moisture and density on shear failure mode, strength and deformation characteristics of interface samples, a series of shearing experiments were performed using a developed shear equipment. The results show that the shear plane of samples all generates along the contact interface, and the shear failure modes can be divided into sliding, sliding & shear-off, and shear-off; the shear stress-displacement curves are strain softening, and the shear stiffness and shear failure displacement are affected by the interface contact conditions; the “jumping” and “plastic” phenomena of post-peak strength reflect the brittle and plastic shear failure features of the interfaces; there is obvious dilation effect in the shear process, and the evolution of shear dilatancy displacement reflects the four stages of the shear process, including compaction of tooth surface, sliding along tooth surface, shear-off of tooth and interface friction; the shear strength of interface samples between loess and Hipparion red clay changes nonlinearly with the interface contact conditions; the peak strength and residual strength increase with the interface contact angle, and the failure mode tends to brittle shear-off; the peak strength decreases with the moisture, and the failure mode tends to plastic shear-off; the higher the density is, the higher the peak strength is, the lower the residual strength is, and the failure mode tends to brittle sliding and shear-off. The above results can provide references for studying the strength criterion of interfaces between loess and Hipparion red clay, and revealing the initiation mechanism of loess landslide.

References:

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Last Update: 2021-04-20