水库下伏采空区覆岩裂隙探查与综合防治技术

Exploration and Comprehensive Treatment Technology of Overburden Fracture in Underlying Goaf of Reservoir

以火石咀煤矿8712工作面采空区注浆充填治理工程为背景,基于开采沉陷理论,利用钻孔波速测试和压水试验,阐明了综放开采后上覆岩层裂隙发育特征。结果表明:综放开采后上覆岩层整体移动过程中,岩体完整性受到不同程度破坏,采空区边缘处形成呈带状分布水平宽度约60 m的张拉断裂带。采用"库底防渗、采空区充填注浆、影响区域残余变形监测"的综合防治技术,取得良好治理效果。

Taking the grouting filling treatment project in the goaf of 8712 working face of Huoshizui Coal Mine as the background,based on the theory of mining subsidence and the method of combining borehole wave velocity test and pressure water test,the characteristics of fracture development in overburden strata after fully mechanized caving are expounded.The results show that during the overall movement of the overlying strata after fully mechanized caving mining,the integrity of the rock mass was damaged to varying degrees,and a tensile gap with a horizontal width of about 60 m was formed at the edge of the goaf.The comprehensive treatment technology of"seepage-proofing at the bottom of the reservoir,full-clay filling and grouting in the goaf,and monitoring the movement and deformation of the affected area"has achieved good governance effects.