煤层底板采动裂隙分布规律及注浆层位优化  

Distribution law of mining induced fractures in coal seam floor and optimization of grouting horizon

作　　者：王长新 曹东风 WANG Changxin;CAO Dongfeng(The Second Institute of Resources and Environment Survey of Henan Province,Luoyang 471000,China;Henan Fracturing Engineering Technology Research Center,Luoyang 471000,China)

机构地区：[1]河南省资源环境调查二院,河南洛阳471000 [2]河南省压裂工程技术研究中心,河南洛阳471000

出　　处：《陕西煤炭》2023年第4期5-12,18,共9页Shaanxi Coal

基　　金：国家自然科学基金重点项目资助“复杂构造破坏的高流变底板岩层隔水性及改造利用基础研究”(51034003)。

摘　　要：为了向煤矿底板注浆改造提供科学依据,采用RFPA^(2D)、FLAC^(3D)数值模拟软件,得到了煤层底板采动裂隙分布规律,并与经验公式进行了对比。研究发现,采用FLAC^(3D)模拟底板破坏深度比较可靠,得到底板破坏深度为14 m;通过对注浆层位进行优化,认为底板注浆加固设计方案中必须合理布置一定数量或在特定部位的本溪组和寒武系注浆加固孔;经数值模拟,底板注浆不仅增大了底板隔水层厚度,而且使底板破坏带深度减少约2 m。该研究对于提高回采工作面超前预注浆效果,以及岩石集中巷注浆加固具有一定指导意义。In order to provide a scientific basis for the grouting transformation of the coal mine floor,the distribution law of mining induced fractures in the coal seam floor is obtained by using RFPA^(2D) and FLAC^(3D) numerical simulation software,and compared with the empirical formula.The research shows that the simulation of the floor failure depth by using FLAC^(3D) is more reliable,and the floor failure depth is 14 m;By optimizing the grouting horizon,and a certain number of grouting reinforcement holes in Benxi Formation and Cambrian System at a specific location must be reasonably arranged in the floor grouting reinforcement design scheme.Through numerical simulation,the grouting of the floor not only increases the thickness of the floor aquifers,but also reduces the depth of the floor failure zone by about 2 m.The research has important technical significance for improving the effect of advance pre grouting in mining face and grouting reinforcement in rock concentrated roadway.

关 键 词：煤层底板 采动裂隙 底板破坏深度 注浆层位 隔水层厚度 

分 类 号：TD325[矿业工程—矿井建设]