摘要
重庆市南川区金佛山甑子岩危岩带的稳定性严重威胁其下部在建金佛山水利工程大坝及水库的安全,为了对该危岩带的治理提供理论依据,选取危岩带变形最严重的W29-1和W29-2两个危岩体,首先定性分析了采矿对其危岩稳定性的影响,得出采矿活动对甑子岩段危岩的发展、变形起到了催化剂的作用;其次采用有限元数值分析的手段,得到了危岩体的位移、剪应力分布规律,即危岩体在岩脚软弱基座处产生剪应力集中,水平位移较大,以致产生鼓胀变形。最后采用有限元强度折减法和极限平衡理论分别得到了危岩体的稳定性系数,两种分析方法结果相近,采用房柱法开采使危岩的稳定系数下降约10%。
The stability of dangerous rock zoneat Zengziyan,Nanchuan district in Chongqing,is a seriously threat to the reservoir-Jinfoshan reservoir,which is under constructing located in the bottom of it. To provide theoretical basis for the control of dangerous rock,this paper selects the worst dangerous rock mass,W29-1 and W29-2,as the research objects. Firstly,the mining activities play a catalyst role on the development of dangerous rock deformation,this is concluded through a series qualitative analysis about influence on the dangerous rock mass by mining. Secondly,the distribution of displacement and shear stress of the dangerous rock was obtained by using the finite element numerical analysis method. Shear stress mainly concentrates on the weak base of the dangerous rock mass locating on the foot,as a result it makes the rock mass from the foot produce a large horizontal displacement and dilatancy. Lastly,it concluded that the stability analyses of dangerous rock zone by using strength reduction method and limit equilibrium method achieve almost identical results. However,the stability factor of the dangerous rock is reduced by about 10% by the use of the Room-and-Pillar mining method.
出处
《地下空间与工程学报》
CSCD
北大核心
2017年第S2期818-821,共4页
Chinese Journal of Underground Space and Engineering
关键词
危岩体
采矿
有限元
强度折减
dangerous rock mass
mining
finite element
strength reduction
