采用环剪仪对超固结黏土抗剪强度特性的研究

›› 2009, Vol. 30 ›› Issue (7): 2000-2004.

采用环剪仪对超固结黏土抗剪强度特性的研究

孙涛^{1, 2}，洪勇^{2, 3}，栾茂田^{1, 2}，陈榕^{1, 2}

1.大连理工大学海岸与近海工程国家重点实验室，大连 116024；2.大连理工大学土木水利学院岩土工程研究所，大连 116024； 3.青岛理工大学土木工程学院，青岛 266000

收稿日期:2007-12-07 出版日期:2009-07-10 发布日期:2011-03-10
作者简介:孙涛，男，1981年生，硕士研究生，主要从事边坡的稳定性分析等方面的研究。
基金资助:
国家自然科学基金资助项目（No. 50679014）；博士后科研基金资助项目（No.20060390987）。

Shear strength behavior of overconsolidated clay in ring shear tests

SUN Tao^{1, 2}, HONG Yong^{2, 3}, LUAN Mao-tian^{1, 2}, CHEN Rong^{1, 2}

1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 2. Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China 3. School of Civil Engineering, Qingdao Technological University, Qingdao 266000, China

Received:2007-12-07 Online:2009-07-10 Published:2011-03-10

摘要/Abstract

摘要：

利用大型高速环剪仪，对不同超固结比、法向应力和剪切速率下的超固结饱和黏土的峰值强度和残余强度特性进行了研究，并对循环荷载作用前后残余强度的变化进行了初步探讨。试验结果表明，（1）超固结比对超固结黏土的峰值强度和残余强度有着明显的影响；（2）在剪切速率相同的条件下，土体达到残余强度时的位移取决于现存的应力状态，而与应力历史无关；（3）剪切速率越大，峰值强度随之增大，达到稳定残余强度时的剪切位移也随之增加，但剪切速率的变化对残余强度值几乎没有影响；（4）在循环荷载作用下残余强度不同程度的降低，最大降低幅度达12.2 %；当土体剪切面为不规则剪切带时，施加循环荷载后出现残余强度上升的现象。

关键词: 环剪试验, 超固结黏土, 剪切速率, 循环荷载, 峰值强度, 残余强度

Abstract:

Detailed studies were conducted on shear peak strength and residual strength of overconsolidated saturated clays at different overconsolidation ratios, normal stresses and shear speeds by employing ring shear apparatus. The residual strength behaviors before and after applying cyclic loads were also investigated. Test results indicate that: overconsolidation ratios have obvious effects on shear peak strength and residual strength of overconsolidated clays; under the same shear speed, shear displacements reaching residual state depend on the present stress state, not being relevant with stress history; with shear speed becoming faster, both peak strength and shear displacement reaching residual state increase, while shear speed has no effects on residual stress; Residual strengths after applying cyclic loads decrease differently, the largest decrease up to 12.2 %. When shear surfaces are irregular shear bands, residual strengths increase after applying cyclic loads.

Key words: ring shear test, overconsolidated clay, shear speed, cyclic load, shear peak strength, residual strength

中图分类号:

TU 443

孙涛，洪勇，栾茂田，陈榕. 采用环剪仪对超固结黏土抗剪强度特性的研究[J]. , 2009, 30(7): 2000-2004.

SUN Tao, HONG Yong, LUAN Mao-tian, CHEN Rong. Shear strength behavior of overconsolidated clay in ring shear tests[J]. , 2009, 30(7): 2000-2004.

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