主应力方向和初始成样含水率对饱和重塑粉土单调剪切特性的影响

›› 2011, Vol. 32 ›› Issue (S2): 324-328.

主应力方向和初始成样含水率对饱和重塑粉土单调剪切特性的影响

张俊峰¹，郭莹^{1, 2}

1. 大连理工大学土木工程学院岩土工程研究所，辽宁大连 116024； 2. 大连理工大学海岸和近海工程国家重点试验室，辽宁大连 116024

收稿日期:2011-04-15 出版日期:2011-08-10 发布日期:2011-08-26
通讯作者: 郭莹，女，1963年生，博士，副教授，主要从事土工实验研究、土体基本特性的研究工作。E-mail: dl-guoying@163.com E-mail:junfenguk@126.com
作者简介:张俊峰，男，1985年生，硕士，主要从事土体基本特性的研究工作
基金资助:
国家自然科学基金重点基金资助项目（No. 50639010）；国家自然科学基金青年基金资助项目（No. 50808033）

Experimental research on effect of orientation of principal stress and initial sampling water content on monotonic shear behavior of saturated remolding silt

ZHANG Jun-feng ¹, GUO Ying^{1, 2}

1. Institute of Geotechnical Engineering, School of Civil Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China; 2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China

Received:2011-04-15 Online:2011-08-10 Published:2011-08-26

摘要/Abstract

摘要： 利用“土工静力-动力液压-三轴扭转多功能剪切仪”，针对初始成样含水率分别为0、5%、10%，夯击法制备的饱和重塑粉土试样，在初始主应力方向角分别为0o、30o、45o的条件下进行非均等固结，然后保持平均主应力100 kPa、中主应力系数0.5、各主应力方向角以及加载速率恒定进行了应力控制式不排水单调剪切试验。着重探讨了主应力方向和初始成样含水率对饱和重塑粉土应力-应变关系、孔隙水压力变化及有效应力路径等的影响。试验结果表明：主应力方向和初始成样含水率对饱和重塑粉土的变形及强度特性具有显著影响。初始成样含水率影响应力-应变关系，对剪切强度影响不太显著，但破坏标准的选择对试验结果影响明显，干装样的孔压值低于湿装样；各种初始成样含水率的归一化剪切强度均随着主应力方向的增加而逐渐降低，而归一化孔压最大值则呈现增大的趋势

关键词: 主应力方向, 初始成样含水率, 饱和重塑粉土, 非均等固结, 应力-应变关系, 有效应力路径

Abstract: By using the soil static and dynamic universal triaxial and torsional shear apparatus, the tamping method was taken to prepare the saturated remolding silt samples with initial sampling water contents of 0, 5% and 10%. The initial anisotropic consolidation was done under the condition of the initial orientation angles of the principal stress at 0o, 30o, 45o respectively. The stress-controlled undrained monotonic shear tests were performed while the mean principal stress of 100 kPa, the intermediate principal stress coefficient of 0.5, the orientation of principal stress and loading rate were all fixed. The effects of the orientation of principal stress and initial sampling water content on the stress-strain relations, the pore pressure development as well as the effective stress paths of saturated remolding silt were respectively studied. The test results show that the principal stress orientation and initial sampling water content have considerable influence on deformation and strength behavior of saturated remolding silt. The stress and stain relationships are influenced by the initial sampling water content; its influence on the shear strength is not significant. The failure standards selected affect significantly on the test results. The water pressure of dry prepared sample is lower than the wet one. The normalized shear strength reduces gradually and normalized maximum pore water pressure increase gradually with the increase of the principal stress direction for all initial sampling water content.

Key words: orientation of principal stress, initial sampling water content, saturated remolding silt, anisotropic consolidation, stress-strain relations, effective stress paths

中图分类号:

TU411

张俊峰，郭莹. 主应力方向和初始成样含水率对饱和重塑粉土单调剪切特性的影响[J]. , 2011, 32(S2): 324-328.

ZHANG Jun-feng , GUO Ying. Experimental research on effect of orientation of principal stress and initial sampling water content on monotonic shear behavior of saturated remolding silt[J]. , 2011, 32(S2): 324-328.

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