特殊应力路径下岸坡饱和土体变形特性模拟

doi:10.16285/j.rsm.2017.03.008

›› 2017, Vol. 38 ›› Issue (3): 672-677.doi: 10.16285/j.rsm.2017.03.008

特殊应力路径下岸坡饱和土体变形特性模拟

陈勇^{1, 2}，杨迎²，曹玲^{1, 2}

1. 三峡地区地质灾害与生态环境湖北省协同创新中心，湖北宜昌 443002；2. 三峡大学土木与建筑学院，湖北宜昌 443002

收稿日期:2015-09-27 出版日期:2017-03-11 发布日期:2018-06-05
作者简介:陈勇，男，1980年生，博士，副教授，主要从事特殊土力学及库岸滑坡诱发机制研究。
基金资助:
国家自然科学基金（No.51409149）

Deformation characteristics simulation of bank slope saturated soils under special stress paths

CHEN Yong^{1, 2}, YANG Ying², CAO Ling^{1, 2}

1. Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang, Hubei 443002, China; 2. College of Civil Engineering & Architecture, China Three Gorges University, Yichang, Hubei 443002, China

Received:2015-09-27 Online:2017-03-11 Published:2018-06-05
Supported by:
This work was supported by the National Natural Science Foundation of China (51409149)

摘要/Abstract

摘要： 库岸边坡土体受到库水位涨落的周期性影响，其受力过程可描述为在前期固结压力范围内有效应力的多次循环加、卸载过程。通过室内应力路径三轴试验模拟土体孔隙水压力的循环加、卸载，并通过对统一硬化模型的扩展和加、卸载准则的修正，来预测土体的变形发展规律，研究结果表明：循环加、卸载过程中，土体的体积变形呈周期性弹性变化，剪应变呈螺旋上升趋势且增幅随循环次数逐渐减小；卸围压屈服阶段，土体变形呈现体积膨胀的剪胀特征和剪应变增幅加快的脆变趋势，且土体剪切变形在6%左右时即出现实测孔压骤减和峰值强度点；建立压缩曲线系数与加、卸载次数的关系，并修正超固结土的加、卸载准则，扩展后的统一硬化模型能够较好地预测特殊应力路径下岸坡饱和土体的变形特性。

关键词: 循环加卸载, 应力路径, 统一硬化模型, 加卸载准则

Abstract: The bank slope soils are periodically influenced by the fluctuation of reservoir level, and its stress process can be described as multi-cyclic loading-unloading process of the effective stress in the pre-consolidation pressure range. The triaxial test of soil stress path is used to simulate the cyclic loading-unloading of soil pore water pressure, and the deformation and development laws of soil are predicted by extending the unified hardening model and modifying the loading-unloading criteria. The results show that during the cyclic loading-unloading process, the volume deformation of the soil is periodically elastic, and the shear strain is in a spiral upward trend and its increment gradually decreases with the number of cycles. During the unloading and confining pressure yielding stage, the soil deformation shows a dilatancy feature of volume expansion and a brittle trend of shear strain increase. The measured pore pressure drops dramatically and the peak intensity point occours when the shear deformation is at about 6%. The relationship between the compression curve coefficient and the number of loading-unloading is established, and the loading-unloading rules of the overconsolidated soil are modified. The extended unified hardening model can predict the deformation characteristics of the bank saturated soil under the special stress paths.

Key words: cyclic loading-unloading, stress path, unified hardening model, criteria of loading-unloading

中图分类号:

TV 698.1+1

陈勇，杨迎，曹玲, . 特殊应力路径下岸坡饱和土体变形特性模拟[J]. , 2017, 38(3): 672-677.

CHEN Yong, YANG Ying, CAO Ling, . Deformation characteristics simulation of bank slope saturated soils under special stress paths[J]. , 2017, 38(3): 672-677.

参考文献

相关文章 15

[1]	朱楠, 刘春原, 赵献辉, 王文静, . 不同应力路径下K0固结结构性黏土微观结构特征试验研究[J]. 岩土力学, 2020, 41(6): 1899-1910.
[2]	赵军, 郭广涛, 徐鼎平, 黄翔, 胡偲, 夏跃林, 张頔. 三轴及循环加卸载应力路径下深埋硬岩变形破坏特征试验研究[J]. 岩土力学, 2020, 41(5): 1521-1530.
[3]	孔亮, 刘文卓, 袁庆盟, 董彤, . 常剪应力路径下含气砂土的三轴试验[J]. 岩土力学, 2019, 40(9): 3319-3326.
[4]	孔宪京, 宁凡伟, 刘京茂, 邹德高, 周晨光, . 应力路径和干湿状态对堆石料颗粒破碎的影响研究[J]. 岩土力学, 2019, 40(6): 2059-2065.
[5]	王辰霖, 张小东, 杜志刚, . 循环加卸载作用下预制裂隙煤样渗透性试验研究[J]. 岩土力学, 2019, 40(6): 2140-2153.
[6]	刘家顺, 王来贵, 张向东, 李学彬, 张建俊, 任昆, . 部分排水时饱和粉质黏土变围压循环三轴试验研究[J]. 岩土力学, 2019, 40(4): 1413-1419.
[7]	李军, 张杨, 胡大伟, 周辉, 卢景景, 吕涛, 史林肯, . 花岗岩三轴循环加卸载条件下的气体渗透率[J]. 岩土力学, 2019, 40(2): 693-700.
[8]	李新明, 孔令伟, 郭爱国, . 原状膨胀土剪切力学特性的卸荷速率效应试验研究[J]. 岩土力学, 2019, 40(10): 3758-3766.
[9]	郭莹, 刘晓东. 成样方法对饱和粉砂不同应力路径下固结排水剪切试验结果的影响[J]. 岩土力学, 2019, 40(10): 3783-3788.
[10]	张坤勇，李威，Charkley Nai Frederick，陈恕,. 小主应力方向加载条件下的掺砾黏土真三轴试验[J]. , 2018, 39(9): 3270-3276.
[11]	杨小彬，韩心星，刘恩来，张子鹏，王逍遥, . 循环加卸载下花岗岩非均匀变形演化的声发射特征试验研究[J]. , 2018, 39(8): 2732-2739.
[12]	翟明磊，郭保华，李冰洋，焦峰,. 岩石节理分级剪切加载-蠕变-卸载的能量与变形特征[J]. , 2018, 39(8): 2865-2872.
[13]	陈敦，马巍，王大雁，穆彦虎，雷乐乐，王永涛，周志伟，蔡聪, . 定向剪切应力路径下冻结黏土变形特性试验[J]. , 2018, 39(7): 2483-2490.
[14]	周辉，姜玥，卢景景，胡大伟，张传庆，陈珺，李震, . 岩石空心圆柱扭剪仪试验能力[J]. , 2018, 39(5): 1917-1922.
[15]	周辉，姜玥，卢景景，胡大伟，张传庆，陈珺，李震, . 岩石空心圆柱扭剪试验系统研制[J]. , 2018, 39(4): 1535-1542.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

特殊应力路径下岸坡饱和土体变形特性模拟

Deformation characteristics simulation of bank slope saturated soils under special stress paths

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 0