走滑活断层对公路的致灾机理研究

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中国公路学报 ›› 2010, Vol. 23 ›› Issue (3) : 35-41.

论文

走滑活断层对公路的致灾机理研究

邓龙胜¹,范文^1,2,3,彭建兵^1,2,熊炜¹

作者信息 +

Research on Failure Mechanism of Highway Induced by Strike-slip Active Fault

DENG Long-sheng¹, FAN Wen^1,2,3, PENG Jian-bing^1,2, XIONG Wei¹

Author information +

文章历史 +

摘要

为了研究公路穿过走滑活断层时的变形、受力机理和破坏特征,建立了有限元地质模型,分析了活断层的走滑位移、活断层带宽度以及活断层与公路夹角等变化的影响效应;并在此基础上,研究走滑活断层环境下公路的破坏模式,提出了公路变形、受力的结构力学求解方法。结果表明:走滑断层带的公路在横向发生弯曲变形,公路两侧的边缘在纵向处于拉、压的受力状态;活断层走滑位移的变化,只改变公路变形和受力的大小,不改变其分布特征;活断层与公路夹角以及活断层带宽度的变化,不改变公路变形和受剪的整体范围,但是对公路变形和剪应力分布特征有较大影响;根据走滑活断层环境下公路的变形和受力特征,可以将其破坏模式总结为剪断破坏和拉-张破坏。

Abstract

In order to study the deformation, mechanical mechanism and failure character of highway in strike-slip active fault environment, a finite element geology model was designed to analyze the effect induced by changing the movement of active fault, width of active fault and separation angle between highway and active fault. Then, the failure modes of highway in strike-slip active fault environment were studied, and the structure mechanics method which was used to calculate the deformation and stress of highway in strike-slip active fault environment was put forward. The result shows that the highway in strike-slip active fault environment is bended and sheared in cross direction, and two sides of highway are in tension and compression states. The change of strike-slip displacement of active fault results in change of the value of deformation and stress of highway except for their distribution characters. The change of separation angle between highway and active fault and the width of active fault result in great change of deformation and shear stress distribution characters except for their general ranges. Based on deformation and mechanical character of highway in strike-slip active fault environment, the failure modes of highway in strike-slip active fault environment can be generalized as sheared failure and tension-compression failure.

导出引用

邓龙胜,范文,彭建兵,熊炜. 走滑活断层对公路的致灾机理研究[J]. 中国公路学报, 2010, 23(3): 35-41

DENG Long-sheng, FAN Wen, PENG Jian-bing, XIONG Wei. Research on Failure Mechanism of Highway Induced by Strike-slip Active Fault[J]. China Journal of Highway and Transport, 2010, 23(3): 35-41

中图分类号： U416.1

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基金

国家自然科学基金项目(40972181);教育部科学技术研究重点项目(109146);地质灾害防治与地质环境保护国家重点实验室开放基金项目(GZ2009-20)

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2009-07-10	2010-05-01
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