顺层岩质高边坡地震变形破坏机制三维数值反演研究

›› 2009, Vol. 30 ›› Issue (11): 3512-3518.

顺层岩质高边坡地震变形破坏机制三维数值反演研究

何铮¹，徐卫亚¹，石崇¹，李明卫²，赵谊²

1. 河海大学岩土工程研究所，南京 210098；2. 中国水电顾问集团贵阳勘测设计研究院，贵州贵阳 550002

收稿日期:2007-11-20 出版日期:2009-11-10 发布日期:2010-01-07
作者简介:何铮，男，1983年生，硕士，主要从事岩土工程方面的研究。
基金资助:
国家自然科学基金资助（No. 50539110）。

3D dynamic response back analysis of failure mechanisms of a high dip bedding rock slope in earthquake

HE Zheng¹，XU Wei-ya1，SHI Chong¹，LI Ming-wei²，ZHAO Yi²

1. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China; 2.Guiyang Hydropower Investigation, Design& Research Institute, China Hydropower Engineering Consulting Group Co., Guiyang 550002, China

Received:2007-11-20 Online:2009-11-10 Published:2010-01-07

摘要/Abstract

摘要：

提出了工程地质分析与三维反演模拟相结合的方法，以揭示边坡地震渐进破坏的失稳过程和失稳机制。结合西南某水电站顺层岩质高边坡工程实例。研究该高边坡地震后工程地质特性，恢复边坡震前的地形地貌，建立地震前未滑塌边坡的三维模型。利用FLAC3D对模型进行动力-时程响应分析，绘制位移、速度、加速度三量放大系数等值线图，判断地震破坏位置。数值模拟结果与边坡实际滑塌情况相符。应用工程地质分析与三维反演模拟结合的方法，揭示了边坡后发型阶段性逐级滑塌的破坏机制以及大夹角折线形的后缘破坏面形状。三维数值反演研究中采用的岩体动力参数，为正演研究提供了参考。

关键词: 岩质高边坡, 顺层, 软弱夹层, 变形破坏机制, 动力时程响应

Abstract:

The failure of a high rock slope is a common phenomena in nature, however it is a very complex subject which is worth studding. This paper presents an analytical method, which is a combination of methods of engineering geology and back analysis, for simulating the deformation behaviors in earthquake and providing some useful insights into the deformation mechanisms. Based on a project of a high dip bedding rock slope of a hydropower station in Southwest China, at first the engineering geological characteristics of the high slope is analyzed. Secondly, a 3D numerical model of the slope before the earthquake is established by estimating the ancient topographic and morphologic characteristics and reinstating the glided mass. Then the software FLAC3D is used to analyze the seismic time-history response of this slope. The calculated results accord with the situation happened in the earthquake. Finally, this 3D dynamic response back analysis method can provides the dynamic coefficients of rock mass which can be used in the next numerical modeling for this slope.

Key words: high rock slope, dip bedding form, week intercalation, deformation mechanism, seismic time-history response

中图分类号:

TU 457

何铮，徐卫亚，石崇，李明卫，赵谊. 顺层岩质高边坡地震变形破坏机制三维数值反演研究[J]. , 2009, 30(11): 3512-3518.

HE Zheng，XU Wei-ya，SHI Chong，LI Ming-wei，ZHAO Yi. 3D dynamic response back analysis of failure mechanisms of a high dip bedding rock slope in earthquake[J]. , 2009, 30(11): 3512-3518.

参考文献

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