剪应变率对湛江强结构性黏土力学性状的影响

›› 2006, Vol. 27 ›› Issue (8): 1235-1240.

剪应变率对湛江强结构性黏土力学性状的影响

蔡羽¹，孔令伟¹，郭爱国¹，拓勇飞²

1. 中国科学院岩土力学重点实验室，武汉 430071；2. 中交第二航务工程勘察设计院，武汉 430071

收稿日期:2005-03-22 出版日期:2006-08-10 发布日期:2013-11-26
作者简介:蔡羽，男，1980年生，硕士，主要从事特殊土土力学研究
基金资助:
中国科学院武汉岩土力学研究所知识创新工程项目（No. Q110201）

Effects of shear strain rate on mechanical behavior of Zhanjiang strong structured clay

CAI Yu¹, KONG Ling-wei¹, GUO Ai-guo¹, TUO Yong-fei²

1. Key Laboratory of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. The Second Harbor Engineering Investigation and Design Institute, China Transportation Engineering, Wuhan 430071, China

Received:2005-03-22 Online:2006-08-10 Published:2013-11-26

摘要/Abstract

摘要： 以湛江强结构性黏土为对象，系统地开展了剪应变率对其力学性状影响的三轴试验研究，发现强结构性黏土具有独特的剪切速率力学效应，其CU剪切强度随剪应变率的增大而呈现先减小后增大的特征，存在临界速率现象；在低围压条件下，剪应变率对孔隙水压力的影响很小，随着围压的增大，其影响逐渐明显；随剪切速率增大，其黏聚力与内摩擦角整体上分别呈现减小与增大的变化规律，而当剪切速率增大到一定程度均出现转折点，但后者滞后于前者。引起上述现象的原因在于黏土的结构性破损性状与其结构性强弱相关联，为深入认识结构性黏土的工程特性提供了帮助。

关键词: 黏土结构性, 剪应变率, 强度指标

Abstract: The effects of shearing strain rate on mechanical behavior of Zhanjiang strong structured clay have been investigated systematically by means of triaxial test. It is discovered that the strong structured clay has special mechanical effect of shearing strain rate; and the CU shear strength increases at first then decreases with the increase of strain rate, and a critical rate exists. The effect of strain rate on pore pressure is not so significant under the low confining pressure condition, whereas with the increase of confining pressure, the effect gradually becomes significant. Furthermore, the cohesion and internal friction angle entirely decreases and increases with the increase of strain rate, respectively, which show turning points when the strain rate increases to a certain value, but the latter lags behind to the former. The above-mentioned phenomena are resulted from the breakage behavior of clay structure related to the strong and weak structure of soil, which provides a help to understand the engineering properties of structured clay further.

Key words: structure of clay, shear strain rate, strength parameter

中图分类号:

TU 411

蔡羽，孔令伟，郭爱国，拓勇飞,. 剪应变率对湛江强结构性黏土力学性状的影响[J]. , 2006, 27(8): 1235-1240.

CAI Yu , KONG Ling-wei , GUO Ai-guo , TUO Yong-fei . Effects of shear strain rate on mechanical behavior of Zhanjiang strong structured clay[J]. , 2006, 27(8): 1235-1240.

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