高承压水上暗斜井开拓断层带底板水害预测与防治技术

Floor Flood Forecast and Control Technology of Subinclined Shaft Excavation in Fault Zone Above High Confined Water

基于大埋深高承压岩溶水上巷道开拓近断层破碎带,底板岩层变形破坏加剧,导致有效隔水层厚度锐减,从而发生突水事故的规律特征。通过分析某煤矿下组煤首采区暗斜井开拓范围内岩体结构、力学性质等地质及水文地质条件,采用力学计算、数值模拟方法,对暗斜井开拓井巷底板岩层导水破坏深度及奥灰含水层导升带高度,进行了理论计算和数值模拟分析。结果表明,随着开挖深度的增加,底板破坏深度增加幅度不同,越接近断层底板岩层导水破坏深度越大。预测行人暗斜井施工至400 m时,存在底板突水隐患。根据井巷底板岩层破坏规律及水害预测结果提出了相应的水害防治措施,保证了暗斜井开拓工程的顺利施工。

Based on the characteristics that the tunnel excavation is near fault fractured zone above great burial depth high pressure karst water,the deformation failure of floor strata is increased and sharply reduces effective impermeable layer thickness and then leads to the water inrush accidents,we analyzed the geological engineering conditions of subinclined shaft in a coal mine first mining area,such as overlying strata spatial occurrence,rock mass structure,mechanical properties.Water damage depth of the roadway floor rock stratum and the ordovician limestone aquifer flowing zone height is calculated and simulated by using thin plate theory and numerical simulation methods.The results show that with the increase of the depth of excavation,the closer the fault floor,the greater the destroy depth of the water guide roadway.It predicted that when the subinclined shaft construction is 400 m,there is water inrush hazard.According to the roadway floor strata failure law and flood forecast results,we propose the corresponding prevention and control measures to ensure the smooth construction of inclined shaft excavation project.