| 峡谷地区大型地下洞室群岩体初始地应力场反演分析 |
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| 引用本文： | 余卫平,杨健,汪小刚,贾志欣.峡谷地区大型地下洞室群岩体初始地应力场反演分析[J].水文地质工程地质,2007,34(2):20-24. |
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| 作者姓名： | 余卫平 杨健 汪小刚 贾志欣 |
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| 作者单位： | 中国水利水电科学研究院,水利部水工程建设与安全重点实验室,北京,100044 |
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| 基金项目： | 国家自然科学基金委、二滩水电开发有限责任公司联合资助的雅砻江水电开发联合研究基金重点项目;中国水利水电科学研究院青年科技专项基金 |
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| 摘 要： | 合理地确定地下洞室群岩体初始地应力场对于地下洞室群的总体布局、支护设计有着重要的意义。本文提出了一种依据少量实测地应力资料反演地下洞室群岩体初始地应力场的方法。这种方法假设远古地形是一无起伏的夷平面,认为岩体初始地应力场主要由处于远古地应力状态下的远古地形经过漫长的地形剥蚀形成,而远古地应力场由地质构造运动和岩体自重形成。以有限元数值分析为基本手段,提出了可以考虑构造运动、岩体自重和地形剥蚀等多因素的岩体初始地应力场反演思路。通过某水电站地下厂房区域岩体初始地应力场反演的工程实例分析,验证了这一方法的可行性和实用性。
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| 关 键 词： | 峡谷地区 初始地应力 反演分析 有限元 |
| 文章编号： | 1000-3665（2007）02-0020-05 |
| 收稿时间： | 2006-05-30 |
| 修稿时间： | 2006-08-25 |
Feedback analysis of initial earth stress field of rock masses in large-scale underground openings situated in valley zone |
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| YU Wei-ping,YANG Jian,WANG Xiao-gang,JIA Zhi-xin.Feedback analysis of initial earth stress field of rock masses in large-scale underground openings situated in valley zone[J].Hydrogeology and Engineering Geology,2007,34(2):20-24. |
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| Authors: | YU Wei-ping YANG Jian WANG Xiao-gang JIA Zhi-xin |
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| Abstract: | Initial earth stress in rock masses is the basic load of surrounding rock of large-scale underground openings of hydropower station,and it also is an important factor affecting the stability of the underground openings.Consequently,it is very vital for the openings layout and support structure design to rationally determine regional earth stress field of the openings surrounding region.This paper put forward the method about how to get regional earth stress field from only few earth stress data of measured points.This method introduced three hypotheses,namely,taking ancient landform as a planation surface,assuming ancient earth stress field to be caused by gravity and tectogenesis,and supposing existing earth stress field to be induced by denudation of ancient landform with ancient earth stress field.Therefore,by virtue of finite element method,the idea,which can take rock gravity,tectogenesis and landform denudation into account,to get initial earth stress field of rock mass was presented.At last,the regional earth stress field of a water power station's underground excavations was studied by back analysis using the above idea.The result shows that the method is feasible and practical. |
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| Keywords: | valley zone initial earth stress back analysis finite element method |
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