The Second Institute of Resources and Environment Survey of Henan Province
Henan Fracturing Engineering Technology Research Center

为了向煤矿底板注浆改造提供科学依据,采用RFPA2D、FLAC3D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FLAC3D模拟底板破坏深度比较可靠,得到底板破坏深度为14m;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2m。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 ofmining induced fractures in the coal seam floor is obtained by using RFPA2D and FLAC3D numerical simulation software,and compared with the empirical formula. The research shows that the simulation of the floor failure depth by using FLAC3Dis more reliable, and the floor failure depth is 14 m; By optimizing the grouting horizon, and a certain number of groutingreinforcement holes in Benxi Formation and Cambrian System at a specific location must be reasonably arranged in the floorgrouting 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 importanttechnical significance for improving the effect of advance pre grouting in mining face and grouting reinforcement in rock concentrated roadway.

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)