底板岩层在采动过程中破坏演变规律的数值模拟研究  

Numerical Simulation Study on the Law of Destroying and Evolution of Floor Strata in Mining Process

作　　者：刘健 LIU Jian(Shanxi Lanhua Qinyu Coal Mine Co.,Ltd.,Jincheng,Shanxi,048212)

机构地区：[1]山西兰花沁裕煤矿有限公司,山西晋城048212

出　　处：《能源科技》2020年第3期22-25,29,共5页Energy Science and Technology

摘　　要：本文对采场采动过程中工作面底板隔水层的运移变形和稳定性演变特征进行数值模拟研究,选择的数值模拟软件为FLAC3D,同时考虑数值模拟计算的难度和计算机的运行负荷对模型做出合理假设。认为采空区围岩塑性屈服方式主要为拉剪复合破坏,其中底板岩层在围岩综合应力的作用下发生拉剪混合破坏。设定峰峰组不具有隔水性,厚度为18m时,隔水层底板未出现原位张裂区域,开采完成后峰峰组含水层与底板相互贯通,工作面底板突水形成;当工作面底板隔水层厚度较大时,施加水压对底板破坏深度的影响效果不明显。In this paper,the characteristics of the movement,deformation and stability evolution of the floor aquiclude of the working face in mining process are studied by numerical simulation.FLAC3D is selected as the numerical simulation software,and the difficulty of numerical simulation calculation and the operation load of computer are also considered to make reasonable assumptions on the model.It is thought that the basic yield mode of the surrounding rock in the goaf is mainly the combined failure of tension and shear,in which the floor strata is subjected to destroy under the combined stress of the surrounding rock.When the thickness of Fengfeng Group is 18m,there is no in-situ tension crack area in the bottom of the aquiclude.After mining,the aquiclude of Fengfeng Group is connected with the bottom of the working face,and the water inrush from the bottom of the working face is formed.When the thickness of the aquiclude of the working face is large,the effect of applying water pressure on the damage depth of the bottom of the working face is not obvious.

关 键 词：底板 隔水层 初次来压 突水 

分 类 号：TD745[矿业工程—矿井通风与安全]