摘要
青藏高原是全球陆内地震活动最为集中而强烈的分布区带之一 ,位于高原块体东北缘的祁连山逆冲推覆型活动山链又是其中最强烈的现代活动构造带之一。大柳树坝址区即位于该活动山链的北祁连山前主边界逆冲断裂活动带向东延伸的分支断裂 ,即古浪 -中卫 -同心弧形逆冲走滑活动断裂带内的东段 ,中卫 -同心弧形逆冲走滑活动断裂带的香山—天景山逆冲推覆构造带内。逆冲带内的主干活动断裂 F2 0 1 的规模及活动强度是影响坝址稳定的主要因素。本文通过分析大柳树坝址区基本断裂构造格局 ,阐述了 F2 0 1 断层活动对坝区内另一条主干断层 F7( 8) 以及位于坝址上分支断层 F39、F40 的控制牵动效应。通过室内有限元数值模拟 ,定量分析了断层 F2 0 1 的活动对分支断层 F39、F40 的牵动程度。
Qinghai-Tibet plateau is one of the areas of the most concentrated and strong seismic activity in the global continent, and Qilian active mountain chain on the northeast margin of Qinghai-Tibet block is one of the most strong active tectonic zone in Qinghai-Tibet block. Daliushu damsite district is situated in the secondary fault zone of the MBT(main boundary thrust) of North-Qilian Mountain front named as Xiangshan-Tianjinshan thrust nappe zone in Gulang-Zhongwei-Tongxin arc thrust-strike-slip active zone. In the thrust nappe zone, the size of the trunk fault F 201 and its active intensity both mainly affect the stability of the dam being built. this paper also expounds fault F 201 controlling on its secondary faults and F 7(8) , another major fault, by analyzing basic framework of the fracture in the district and activity of the secondary fault F 39 and F 40 is quantitatively simulated by finite element method.
出处
《地质灾害与环境保护》
2002年第4期46-50,共5页
Journal of Geological Hazards and Environment Preservation
关键词
大柳树坝址
活动断裂带
构造格局
工程抗断
数值模拟
Daliushu-damsite
active fault zone
engineering anti-fracturing
numerical simulation
