大连滨海粉质黏土剪切力学特性环剪试验

doi:10.13278/j.cnki.jjuese.201605203

吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (5): 1475-1481.doi: 10.13278/j.cnki.jjuese.201605203

大连滨海粉质黏土剪切力学特性环剪试验

洪勇¹, 岳玉秋¹, 郑孝玉², 车效文¹, 刘鹏¹

1. 青岛理工大学土木工程学院, 山东青岛 266033;
2. 吉林大学建设工程学院, 长春 130026

收稿日期:2016-03-20 出版日期:2016-09-26 发布日期:2016-09-26
作者简介:洪勇(1970-),男,副教授,主要从事岩土力学和地质灾害方面的研究,E-mail:hongyong11@aliyun.com
基金资助:
国家自然科学基金项目（41272341，41572259）；山东省高等学校科技计划项目（J12LG08）；成都理工大学国家重点实验室开放基金项目（SKLGP2012K013）

Shear Strength of Silty Clay in Dalian by Ring Shear Tests

Hong Yong¹, Yue Yuqiu¹, Zheng Xiaoyu², Che Xiaowen¹, Liu Peng¹

1. Civil Engineering College, Qingdao University of Technology, Qingdao 266033, Shandong, China;
2. Construction Engineering College of Jilin University, Changchun 130026, China

Received:2016-03-20 Online:2016-09-26 Published:2016-09-26
Supported by:
Supported by National Natural Science Foundation of China (41272341; 41572259), Science and Technology Project in Colleges and Universities of Shandong Province (J12LG08)and Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology (SKLGP2012K013)

摘要/Abstract

摘要：

以大连滨海地区典型粉质黏土为研究对象，利用大型高速环剪仪，针对不同法向应力和剪切速率条件下该粉质黏土大剪切力学性质的变化情况进行了试验。环剪试验结果显示：1）该滨海粉质黏土在正常固结状态下出现明显的应变软化现象，分析表明其应变软化特性主要与土中黏土矿物质量分数及其在剪切过程中的定向排列有关。2）在相同剪切速率下，峰值强度和残余强度随法向应力的增加而增大，峰值强度与法向应力之间表现出良好的线性关系。3）由于峰值强度产生过程中土体内部黏聚力的变化，峰值强度随剪切速率的增加而增大；残余强度变化与剪切速率具有一定的相关性，这与不同剪切速率下剪切带（面）处黏土颗粒定向排列程度不同有关。

关键词: 粉质黏土, 环剪试验, 应变软化, 峰值强度, 残余强度, 剪切位移

Abstract:

The change of the shear mechanics properties of typical silty clay in Dalian Binhai area was tested at different normal stresses and shear rates by ring shear apparatus.Test results indicate that: 1) strain-softening phenomenon of silty clay was observed in normal consolidation state. It was shown that strain softening feature is mainly related to the mass fraction and directionality of clay mineral in the soil in the process of shearing.2)At the same shear rate, the peak strength and residual strength increase with the increase of normal stresses, and showed a good linear relationship between normal stress and peak intensity.3)Due to internal cohesive force of soil changes in the process of peak intensity, the peak intensity increases with the increase of shear rate;the residual strength and shear rate have certain correlation, which has a relationship with shear zone (surface) of clay grain orientation arrangement at different levels under different shear rates.

Key words: silty clay, ring shear test, strain softening, peak strength, residual strength, shear displacement

中图分类号:

P642.114

洪勇, 岳玉秋, 郑孝玉, 车效文, 刘鹏. 大连滨海粉质黏土剪切力学特性环剪试验[J]. 吉林大学学报(地球科学版), 2016, 46(5): 1475-1481.

Hong Yong, Yue Yuqiu, Zheng Xiaoyu, Che Xiaowen, Liu Peng. Shear Strength of Silty Clay in Dalian by Ring Shear Tests[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(5): 1475-1481.

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大连滨海粉质黏土剪切力学特性环剪试验

Shear Strength of Silty Clay in Dalian by Ring Shear Tests

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