深井条带面高压逾裂煤层注水模拟与卸压应用

Simulation of Water Infusion in Deep Strip Working Face by High- pressure Gradual Splitting and Its Application in Stress Relief

淄博矿业集团唐口煤矿毗邻济宁市区,地面村庄压煤比较严重,为保证矿井的正常生产接续,该矿采煤工作面一般采用90 m面长的条带面。由于唐口煤矿为千米深井,煤层具有冲击倾向性,且煤层孔隙率小、地应力大,因此可采用煤层注水工艺达到卸压的目的。首先构建了以煤体的流固耦合方程、液体流在多孔介质的连续性方程为基础的煤层注水数学模型。在建立煤层注水数值模拟几何模型的基础上,根据济北煤田的实际情况,采用ANSYS计算软件对70 m单向长钻孔布置形式在3.5、21.0 MPa两种注水压力条件下的渗流压力场、速度场,以及煤体水分增加情况进行了数值模拟。根据模拟结果,设计了针对唐口煤矿5301工作面的高压逾裂煤层注水技术工艺,取得了较好的卸压效果。

Tangkou Coal Mine of Zibo Mining Group is near to Jining city and the coal mining is influenced by villages seriously. For ensuring the normal production of the mine, 90 m-long strip working face is generally adopted. Since Tangkou Mine is a mine with the mining depth over 1 000 m, the coal seams are prone to burst and have low porosity and large ground stress, water infusion in coal seams may be adopted to achieve the goal of stress relief. A mathematical model of coal seam water infusion was established on the basis of fluid-solid coupling equation of coal and the continuous equation of fluid in porious medium. Based on the establishment of the geometrical model for numerical simulation of coal seam water infusion, numerical simulation was carried out on the seepage pressure field, velocity field and moisture increasement of coal seam under the conditions of 70 m one-way hole as well as 3. 5 MPa and 21. 0 MPa water pressures according to the actual conditions of Jibei Coal field and by using ANSYS softwere. Finally, seam water infusion technology by high-pressure gradual splitting for 5301 working face of Tangkou Mine was designed, and better stress relief effect was achieved.