煤矿顶板含水层溃水溃沙灾害井下挡水墙建造技术

Construction Technology of Water-retaining Wall after Water and Sand Bursting in the Aquifer of Coal Mine Roof

以宁东鸳鸯湖矿区麦垛山煤矿2煤回风大巷溃水溃沙灾害为例,利用平衡理论简化计算方法,以巷道尺寸及围岩性质为约束条件,建立挡水墙承抗压、抗剪强度计算的物理和数学模型,定量计算了墙体、围岩可承受的安全水头高度,构建混凝土砌块平板式挡水墙,核算出当围岩槽深为0.5 m、两侧砌块厚度分别为0.5 m、混凝土浇筑厚度为1.0 m时,可满足强度要求,并提出了该形式挡水墙体的建造工艺,为恢复生产提供保护屏障,实现了对麦垛山煤矿2煤大巷溃水溃沙灾害的安全治理。

Taking the water and sand burst disaster of No.2 coal return air roadway in Maiduoshan Coal Mine of Yuanyanghu Mining Area in Ningdong as an example, using the simplified calculation method of equilibrium theory and taking the size of roadway and the nature of surrounding rock as the constrains, the physical and mathematical models for calculating the compressive and shear strength of the water-retaining wall were established. The safe head height of the wall and the surrounding rock was calculated quantitatively, and the concrete block water-retaining wall in flat type was constructed. It is calculated that when the depth of the surrounding rock groove is 0.5 m, the thickness of the blocks on both sides is 0.5 m, and the concrete pouring thickness is 1.0 m, the strength requirements can be met. The construction technology of this type of water- retaining wall is put forward to provide a protective barrier for the recovery of production, and realize the safety management of the water and sand burst disaster of the No.2 coal roadway in Maiduoshan Coal Mine.