|Table of Contents|

Experiment on Mechanical Properties of Interface Loess Under Triaxial Compression(PDF)

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

Issue:
2022年第06期
Page:
1027-1036
Research Field:
纪念刘国昌先生诞辰110周年专辑
Publishing date:

Info

Title:
Experiment on Mechanical Properties of Interface Loess Under Triaxial Compression
Author(s):
MA Zhe1; 2;  PENG Jian-bing1; 2*;  ZHAO Lu-qing1; 2;  NING Rui-hao1; 2;  LI Ze-kun1; 2
(1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
meso-interface;  Malan loess;  triaxial compression;  stress-strain;  deformation law;  failure characteristic;  Shaanxi
PACS:
P642
DOI:
10.19814/j.jese.2022.03028
Abstract:
Loess meso-interface is a structural defect widely distributed in loess, and is an important control factor for loess catastrophe. In order to find the influence of meso-interface on the mechanical behavior of loess, the network subdivision line was marked on the sidewall of the soil sample, and the conventional triaxial compression test of loess remodeled by the prefabricated interface was carried out, and the network subdivision of the sidewall of the sample after failure was obtained; the influences of meso-interfaces at different positions on soil strength and deformation and failure characteristics were analyzed. The results show that ① the deformation of the sample is mainly divided into axial deformation and bending deformation, and the main deformation is axial; the failure mode is mainly “X” type and 45° shear; according to the failure form, failure scale and stress-strain curve type after failure, the network subdivision line of the sidewall after failure is divided into 4 types, including weak hardening type, weak hardening type after yielding, softening type and double-peak strong softening type; ② the stress-strain curve of the sample is mainly softening type, which is affected by the position of the meso-interface and the confining pressure; when the middle interface of soil samples shows weak hardening type after yielding, and the top and bottom interfaces of soil samples show double-peak strong softening type; ③ the middle interface of soil sample has the strongest degradation effect on the soil strength, followed by the top and bottom interfaces. The stress-strain, deformation and failure characteristics of meso-interface loess are affected by the interface position, test confining pressure and other factors. The above results can provide a reference for the further research of the meso-interface loess strength criterion and the mechanism of meso-interface on the loess disaster.

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Last Update: 2022-11-25