张昆祥^1,,
叶海林²,
张化杰¹,
杨淑艳³
1. 中国地质大学(北京)工程技术学院, 北京 100083
2. 北京特种工程设计研究院, 北京 100028
3. 北京环安工程检测有限责任公司, 北京 100082

基金项目: 国家自然科学青年基金项目（批准号：41302234）资助


详细信息

作者简介: 张昆祥, 男, 26岁, 硕士研究生, 岩土工程学专业, E-mail:2744010132@qq.com

中图分类号: P642

收稿日期:2019-04-11
修回日期:2019-08-23
刊出日期:2019-11-30

Analysis on rock slope failure and dynamic response induced by earthquake

Zhang Kunxiang^1,,
Ye Hailin²,
Zhang Huajie¹,
Yang Shuyan³
1. Civil Engineering, China University of Geosciences(Beijing), Beijing 100083
2. Research Institute of Special Engineering and Design, Beijing 100028
3. Beijing Huan'an Engineering Inspection & Test Co., Ltd, Beijing 100082


MSC: P642

--> Received Date: 11 April 2019
Revised Date: 23 August 2019
Publish Date: 30 November 2019


摘要
摘要:以位于规划修建的成兰铁路茂县车站（31.93°N，103.68°E）和茂县隧道（31.94°N，103.67°E）之间的一个含软弱夹层的边坡为例，采用FLAC3D研究了该边坡在汶川卧龙站（NE向）实测地震波（以下简称卧龙波）和正弦波作用下的动力响应特性及破坏特征。结果表明：输入卧龙波和正弦波得到的加速度响应峰值在边坡内部的分布规律基本相同，但是输入卧龙波得到的加速度响应峰值要大于输入正弦波得到的加速度响应峰值；输入两种不同地震波得到的水平方向加速度响应峰值都要大于竖直方向加速度响应峰值。得到的加速度响应峰值在边坡内部的分布规律是沿着坡面方向随高程增大加速度响应峰值逐渐增大，在水平方向上与坡面距离越小，其加速度响应峰值越大。输入地震波幅值增大，监测点加速度响应峰值也增大；输入地震波幅值为0.8 g（其中g代表重力加速度，常取值9.8 m/s²）时，关键监测点加速度响应峰值发生突变，表明输入地震波幅值为0.8 g时边坡失稳；边坡的破坏特征表现在边坡体的上部拉破坏和下部的剪切破坏，边坡上部的拉破坏向下部发展，下部的剪切破坏向上发展，最终两者贯通形成破坏面。
关键词: 边坡/
地震/
动力响应/
数值模拟

Abstract:Taking a slope with a weak intercalated layer between Mao County Station (31.93°N, 103.68°E) of Chengdu-Lanzhou Railway and Mao County Tunnel (31.94°N, 103.67°E) planned to be built as an example. FLAC3D was conducted to study dynamic response characteristics and failure characteristics of the slope under the action of actually measured seismic wave at Wenchuan Wolong Station (here after referred to as Wolong Wave) and sine wave. The results show that the distribution law of peak acceleration response inside the slope obtained by inputting Wolong Wave and sine wave is basically the same, but the peak value of acceleration response obtained by inputting Wolong Wave is bigger than that obtained by inputting sine wave; and the peak value of horizontal acceleration response obtained by inputting two different kinds of seismic waves is bigger than the peak value of vertical acceleration response. The distribution law of the peak acceleration response obtained inside the slope is as follows:in the direction of slope surface, with the increase of elevation, the peak value of acceleration response gradually increases, in the horizontal direction, the smaller the distance from the slope surface is, the bigger the peak value of acceleration response is. With the increase of the amplitude of inputting seismic wave, the peak value of acceleration response at the monitoring point increases; when the amplitude of inputting seismic wave is 0.8 g (in which, g represents acceleration of gravity), the peak value of acceleration response of the key monitoring point has a sudden change, indicating the slope instability when the amplitude of seismic wave input is 0.8 g; and failure characteristics of the slope appear as tensile failure of the upper part and shear failure of the lower part of the slope body. The tensile failure of the upper part of the slope develops downward, and the shear failure of the lower part develops upwards. Finally, they form the failure surface.
Key words:slope/
earthquake/
dynamic response/
numerical simulation



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