软岩岩层厚度、刚度和水平应力对关键层应力的影响  

Influence on key stratum stress by weak strata thickness,stiffness and horizontal stress

作　　者：王平[1,2] 朱永建[1,2] 余伟健[1,2] 

机构地区：[1]湖南科技大学能源与安全工程学院,湖南湘潭411201 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《矿业工程研究》2012年第2期5-9,共5页Mineral Engineering Research

基　　金：湖南省自然科学基金资助项目(11JJ5030);国家自然科学基金资助项目(51104063)

摘　　要：为了进一步研究采场上覆岩层的移动规律,对影响关键层上载荷分布的因素进行分析.采用FLAC如软件模拟了不同的软岩岩层厚度、刚度和水平应力对关键层上载荷峰值的影响.通过模拟,发现关键层上覆软岩岩层的厚度、层刚度和水平应力对关键层的载荷峰值都有影响,且不同的水平应力在关键层破断前后会产生不同的影响.在初次来压前,水平应力加速了采空区的上方关键层的破断,但延缓了煤壁前方关键层的破断.初次来压后对关键层的破断影响很小.通过此次研究可以对关键层的破断以及采场的周期来压进行预测,对于采场覆岩的控制具有一定的指导意义.In order to clarify the overlying strata movement law in stope, this paper mainly analyzes the impact of load distribution in key stratum. It simulates the impacts of different horizontal stress and weak rock strata＇ thickness and stiffness on the peak load in key stratum by FLAC3D software. Through the simulation, it is found that the thickness, stiffness of overlying weak rock strata and horizontal stress have impact on the peak load of the key stratum. Moreover, the different horizontal stress has different implications at before and after the key stratum break. Before the first weighting, horizontal stress accelerates the key stratum break which is above the goaf, but slows down the broken in front coal wall. After first weighting, it has little effect on the key stratum break. Through this study, it can predict the broken of key strata and periodic weighting, for the stop strata control has certain directive significance.

关 键 词：岩层控制 软岩岩层 关键层 正交试验 载荷峰值 

分 类 号：TD32[矿业工程—矿井建设]