摘要
为探究离层注浆充填对地层保水效果的影响,构建地层岩体渗流场和裂隙场空间演变模型,分析离层空间充填后地层岩体导水性能演化特征。结果表明:受覆岩影响,岩体裂隙长度、孔隙率和水力传导率高值区由离层两端向中心区域集中;未充填时,离层上方关键层两端受拉剪破坏影响,关键层两端裂隙发育明显,孔隙率和水力传导率增大;充填高度增加,关键层断裂后受充填体支撑未完全破坏,孔隙率和水力传导率相对减小;岩层裂隙、孔隙率、水力传导率和水头的模拟结果证明对离层进行充填可有效减少含水层渗流量,离层充填高度越大,保水效果越好。
In order to study the influence of separation layer grouting filling on water retention effects of the stratum,a spatial evolution model for seepage and fracture fields of formation rock mass was constructed.In addition,the evolution characteristics of water conductivity of formation rock mass after the spatial filling of separation layers were explored.The results show that the high-value areas of fracture length,porosity,and hydraulic conductivity of rock mass are concentrated from the two ends of the separation layer to the central area due to the influence of overburden.When the separation layer is not filled,the two ends of the critical layer above the separation layer are affected by tensile and shear damage.The fractures at both ends of the critical layer develop obviously,and the porosity and hydraulic conductivity increase.With the increase in filling height,the critical layer is not completely destroyed due to the support of the filling body after the span falls.The porosity and hydraulic conductivity are relatively reduced.The simulation results of rock fracture,porosity,hydraulic conductivity,and water head show that filling separation layers can effectively reduce the seepage flow of aquifers.In addition,higher filling heights of separation layers indicate better water retention effects.
作者
闫寅山
YAN Yinshan(Yujialiang Coal Mine of Shendong Coal,CHN Energy,Yulin Shaanxi 719000,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2022年第S02期123-130,共8页
China Safety Science Journal
关键词
离层
注浆充填
保水效果
关键层
数值模拟
separation layer
grouting filling
water retention effect
critical layer
numerical simulation
