超固结软黏土的静止土压力系数与不排水抗剪强度

doi:10.16285/j.rsm.2017.04.004

›› 2017, Vol. 38 ›› Issue (4): 951-957.doi: 10.16285/j.rsm.2017.04.004

超固结软黏土的静止土压力系数与不排水抗剪强度

纠永志^{1, 3}，黄茂松^{1, 2}

1. 同济大学地下建筑与工程系，上海 200092；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092； 3. 中原工学院建筑工程学院，河南郑州 450007

收稿日期:2015-04-29 出版日期:2017-04-11 发布日期:2018-06-05
通讯作者: 黄茂松，男，1965年生，教授，博士生导师，从事岩土工程方面的科研和教学工作。E-mail: mshuang@tongji.edu.cn E-mail: jyz912@163.com
作者简介:纠永志，男，1982年生，博士，讲师，从事岩土工程方面的科研和教学工作
基金资助:
国家973计划课题(No. 2013CB036304)。

Coefficient of earth pressure at rest and undrained shear strength of overconsolidated soft clays

JIU Yong-zhi^{1, 3}, HUANG Mao-song^{1, 2}

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China; 3. School of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou, Henan 450007, China

Received:2015-04-29 Online:2017-04-11 Published:2018-06-05
Supported by:
This work was supported by the National Basic Research Program of China (973 Program) (2013CB036304).

摘要/Abstract

摘要： 通过应力路径三轴试验对不同超固结比下饱和软黏土的K0系数及K0超固结软土的抗剪强度进行了研究，提出了超固结软土的K0系数计算公式，基于各向异性屈服准则推导了K0超固结软黏土的不排水抗剪强度，并与试验结果对比证明了计算公式的有效性。分析表明，常用的Mayne-Kulhawy K0系数计算公式过高地估算较大超固结比OCR时的K0系数，同时所提出的K0超固结软黏土不排水抗剪强度公式通过考虑土体K0系数随OCR的变化，避免了假设以有效上覆压力表示的回弹线斜率为常数所存在的问题。通过与试验结果对比表明，该公式能较好地预测K0超固结土体的不排水抗剪强度。

关键词: 三轴试验, K0固结, 静止土压力系数K0, 抗剪强度, 超固结比

Abstract: The stress path triaxial tests were conducted to examine the coefficient of K0 of different stress paths and the undrained shear stress-strain under K0-conlidation. Formula of K0 coefficient was proposed for K0 overconsolidated soil. Based on anisotropic yield criteria, the undrained shear strength equations of K0 overconsolidated soil were developed. The validity of proposed procedure was verified by comparing calculated results and experimental results. The results indicated that the formula proposed by Mayne and Kulhawy overestimated the coefficient when the OCR was large. The undrained shear strength equations of K0 overconsolidated soil avoided errors which were caused by assuming a constant slope of rebound denoted by the effective overburden pressure, by considering the variation of K0 coefficient with OCR. Experimental results indicated that the proposed formula has the advantage to predict the undrained shear strength of K0 overconsolidated soil.

Key words: triaxial test, K0-consolidation, coefficient of earth pressure at rest (K0), shear strength, overconsolidation ratio

中图分类号:

TU 411

纠永志，黄茂松, . 超固结软黏土的静止土压力系数与不排水抗剪强度[J]. , 2017, 38(4): 951-957.

JIU Yong-zhi, HUANG Mao-song, . Coefficient of earth pressure at rest and undrained shear strength of overconsolidated soft clays[J]. , 2017, 38(4): 951-957.

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超固结软黏土的静止土压力系数与不排水抗剪强度

Coefficient of earth pressure at rest and undrained shear strength of overconsolidated soft clays

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