黄土坡滑坡饱和滑带土三轴压缩应力松弛试验研究

doi:10.16285/j.rsm.2018.0955

岩土力学 ›› 2018, Vol. 39 ›› Issue (S2): 209-216.doi: 10.16285/j.rsm.2018.0955

黄土坡滑坡饱和滑带土三轴压缩应力松弛试验研究

崔德山¹，陈琼¹，项伟^{1, 2}，王菁莪²

1. 中国地质大学（武汉）工程学院，湖北武汉 430074；2. 中国地质大学（武汉）教育部长江三峡库区地质灾害研究中心，湖北武汉 430074

收稿日期:2015-05-31 出版日期:2018-12-21 发布日期:2019-01-04
作者简介:崔德山，男，1981年生，博士，副教授，主要从事地质灾害防治方面的研究工作。
基金资助:
国家自然科学基金项目（No.41772304）；国家自然科学基金青年基金项目（No.41602313）

Experimental study of stress relaxation characteristics of saturated sliding zone soils of Huangtupo landslide under triaxial compression

CUI De-shan¹, CHEN Qiong¹, XIANG Wei^{1, 2}, WANG Jing-e²

1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China; 2. Three Gorges Research Center for Geo-hazard of Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074 China

Received:2015-05-31 Online:2018-12-21 Published:2019-01-04
Supported by:
This work was supported by the National Natural Science Foundation of China (41772304) and the Young Scholars of National Natural Science Foundation of China(41602313).

摘要/Abstract

摘要： 为研究饱和滑带土的三轴流变规律，基于室内三轴试验，对三峡库区巴东县黄土坡滑坡的滑带土应力松弛特性进行试验和分析。首先，对滑带土进行X射线衍射试验和XRF定量分析实验，获得了滑带土的矿物成分和化学组成。然后，采用GDS三轴仪开展饱和滑带土的应力松弛实验，研究不同围压和不同应变增量条件下滑带土的应力松弛特征。研究结果表明，饱和滑带土的应力松弛特征受围压、轴向应变速率、轴向应变增量、松弛时间的影响较大。根据应力松弛曲线可以分别得出滑带土的峰值强度和残余强度指标，当轴向应变接近破坏应变（15%）时随着有效围压的增加，滑带土的应力松弛量和残余应力比增加，应力松弛比减小；当轴向应变恒定时，滑带土的体积应变大于应变增加过程中的体积应变。当应变加载速率较小（0.02 mm/min）时应变加载过程中会出现瞬时应力松弛现象。

关键词: 滑带土, 三轴压缩试验, 应力松弛, 主应力差, 体积应变, 松弛时间

Abstract: In order to study the rheological characteristics, based on indoor triaxial compression test, the stress relaxation characteristics of saturated sliding zone soil from Huangtupo landslide in the Three Gorges Reservoir are analyzed. The XRD and XRF tests are carried out to investigate the mineral composition and chemical composition. The GDS triaxial test equipment is used to carry out the stress relaxation test of saturated sliding zone soil so as to describe the stress relaxation characteristic under different confining pressures and different strain increments. The test results show that the stress relaxation of saturated sliding zone soil has a relationship with confining pressure, axial strain rate, axial strain increment and relaxation time. The peak strength parameters and residual strength parameters can be obtained by the stress relaxation curves. The amount of stress relaxation and residual stress ratio of sliding zone soil increase with increasing confining pressure when the axial strain is close to the failure strain(15%); but the ratio of stress relaxation decreases. The volumetric strain in constant axial strain phase of sliding zone soil is much larger than that in increasing axial strain phase. When the strain rate is very small (0.02mm/min), the stress relaxation occurs during loading.

Key words: sliding zone soil, triaxial compression test, stress relaxation, deviatoric stress, volumetric strain, relaxation time

中图分类号:

TU 443

崔德山, 陈琼, 项伟, 王菁莪, . 黄土坡滑坡饱和滑带土三轴压缩应力松弛试验研究[J]. 岩土力学, 2018, 39(S2): 209-216.

CUI De-shan, CHEN Qiong, XIANG Wei, WANG Jing-e, . Experimental study of stress relaxation characteristics of saturated sliding zone soils of Huangtupo landslide under triaxial compression[J]. Rock and Soil Mechanics, 2018, 39(S2): 209-216.

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黄土坡滑坡饱和滑带土三轴压缩应力松弛试验研究

Experimental study of stress relaxation characteristics of saturated sliding zone soils of Huangtupo landslide under triaxial compression

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