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地震作用下含软弱夹层的反倾向岩质边坡动力响应及变形破坏机制研究

发表时间:2013-07-31  浏览量:1169  下载量:565
全部作者: 邵东桥,谌文武,黄云飞
作者单位: 兰州大学土木工程与力学学院,西部灾害与环境力学教育部重点实验室
摘 要: 运用有限差分软件FLAC3D建立了一个含软弱夹层的反倾岩质边坡三维模型,研究反倾向岩质边坡在地震作用下的加速度响应规律,通过对该边坡坡面加速度、坡顶加速度、软弱夹层内加速度、塑性区的性质、形成次序、扩展情况、软弱夹层内关键单元剪应变增量的变化研究分析其变形破坏机理。结果表明:地震作用下含软弱夹层的反倾岩质边坡坡面点水平向和垂直向加速度峰值放大系数随高程增加而增大;岩体对输入地震波存在垂直放大作用,在软弱夹层处和坡顶增幅较大。岩体对地震波低频段的能量起到放大作用,对高频段的地震波存在滤波作用,但滤波作用并不明显;反倾岩质边坡变形破坏主要发生在软弱夹层中,塑性区表现为在软弱夹层上部拉破坏与下部拉剪破坏。
关 键 词: 地基基础工程;反倾岩质边坡;软弱夹层;地震作用;动力响应;变形机制
Title: Dynamic response, deformation and failure mechanism of toppling rock slope with weak interlayer under earthquakes
Author: SHAO Dongqiao, CHEN Wenwu, HUANG Yunfei
Organization: Key Laboratory of Mechanics on Western Disaster and Environment, Ministry of Education, College of Civil Engineering and Mechanics, Lanzhou University
Abstract: This article established a three-dimensional model of the toppling rock slope with weak interlayer, and the acceleration response regulation of a toppling rock slope under the seismic action was investigated by using the three-dimensional finite difference software FLAC3D. Then the deformation and failure mechanism was analyzed through the investigation on the nature of the plastic zone, the formation of order, the expansion of the plastic zone, and changes of shear strain increment of key elements. The results showed that under the seismic action, the amplification coefficients of the horizontal and vertical peak accelerations of the toppling rock slopes increased with the increasing elevation. The rock mass had vertical amplification effect on the input seismic waves and the wave amplitude came to the maximum at the weak layer and the top of the slope. Furthermore, rock mass amplified the input seismic with low frequency and filtered those with high frequency, but the filtering effect was not obvious. Toppling rock slope deformation and failure occurred mainly in the weak layer. In the plastic zone, the performance presented the upper tensile failure and the lower part of the pull-shear failure with weak layer.
Key words: ground foundation engineering; toppling rock slope; weak interlayer; earthquake; dynamic response; deformation mechanism
发表期数: 2013年7月第14期
引用格式: 邵东桥,谌文武,黄云飞. 地震作用下含软弱夹层的反倾向岩质边坡动力响应及变形破坏机制研究[J]. 中国科技论文在线精品论文,2013,6(14):1333-1340.
 
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