土体含水率对边坡动力破坏模式及动力响应影响的振动台试验研究

杨兵; 孙明祥; 王润民; 杨涛; 冯君; 周德培

doi:10.11779/CJGE201804021

土体含水率对边坡动力破坏模式及动力响应影响的振动台试验研究 English Version

西南交通大学土木工程学院，四川成都 610031;

基金项目: 国家重点研发计划项目（2016YFC0802203）; 国家自然科学基金项目（10902112）; 中央高校基本科研业务费专项资金项目（2682017QY02）

详细信息

作者简介:
杨兵(1976- ),男,副教授,主要从事边坡动力学及稳定性研究。E-mail: yangb@home.swjtu.edu.cn。

通讯作者:
杨涛，E-mail：yang_tao@home.swjtu.edu.cn

中图分类号: TU435
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出版历程
- 收稿日期: 2016-12-04
- 发布日期: 2018-04-24

Shaking table tests on influences of water content of soils on dynamic failure modes and dynamic responses of slopes

School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;

摘要

摘要: 正确认识地震作用下边坡的破坏模式及动力响应特征可以为边坡抗震设计提供理论指导。为了探讨边坡土体含水率的变化对边坡破坏模式及动力响应的影响，针对该问题展了室内振动台模型试验，分析了不同含水率边坡失稳破坏的物理过程，以及在地震荷载作用下边坡动力响应规律。试验结果表明土体含水率对边坡破坏模式有较大影响，含水率6.8%和10%的砂土边坡分别表现为震裂–溃滑型和震裂–溃散型滑坡破坏形式，含水率18.1%和24.6%的黏土边坡分别表现为震裂–溃散性和震裂–蠕滑型滑坡破坏形式；在参数考虑的范围内含水率较大的边坡比含水率较小的边坡更稳定；在水平动力载荷作用下，边坡表面的土体位移变化规律能够反应出边坡失稳破坏特征；对于该文讨论的砂土和黏土边坡而言，含水率大的边坡加速度放大效应弱于含水率小的边坡；从土体阻尼角度解释了含水率变化对边坡失稳影响的机理。
- 土体含水率 /
- 边坡 /
- 破坏模式 /
- 动力响应 /
- 振动台试验
Abstract: Understanding exactly the failure mode and dynamic response of slopes in seismic loading can provide a theoretical guideline for anti-earthquake design of slopes. In order to investigate the influences of water content of soils on dynamic failure modes and dynamic responses of slopes, the laboratory shaking table tests are conducted. The physical process of failure of slopes with different water contents and the dynamic responses of slopes in earthquake loading are analyzed. The test results show that the water content of soils in slopes has important influences on their failure modes. The sandy slopes with water contents of 6.8% and 10% in the soils have failure modes of shatter-collapse sliding and shatter-breakup sliding respectively. The clay slopes with water contents of 18.1% and 24.6% in the soils have failure modes of shatter-breakup sliding and shatter-creep sliding respectively. The slope with a larger water content of soils is more stable than that with a smaller water content at the range of parameters considered. Under the action of horizontal dynamic load, the variation of displacement of soils at the surface of slope can reflect the characteristics of slope failure. The amplification effect of acceleration for the slope with a larger water content of soils is smaller than that with a smaller water content for the case of sandy soil slope and cohesive slope considered. The mechanism about the influences of water content in the slope on the failure of slopes is explained with the damping of soils.
- water content of soil /
- slope /
- failure mode /
- dynamic response /
- shaking table test

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2.	赵宏昱，王国义，杨兵，宋松科，权新蕊. 雨后不同时长基覆型边坡动力失稳破坏研究. 防灾减灾工程学报. 2024(04): 933-939+951 . 百度学术
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