薄基岩采动裂缝水砂流运移过程的模拟试验

Experimental research on the movement process of mixed water and sand flow across overburden fissures in thin bedrock induced by mining

在分析厚松散层薄基岩下开采水砂突涌工程地质模式的基础上,设计自制了水砂混合流运移及突涌模型。试验以0.05 MPa和0.10 MPa水压力条件下的不同水砂混合物成分、不同通道裂缝宽度为例,揭示了孔隙水压力在裂缝通道中不同位置的变化特征。通过设置的模型试验,定量化地研究水砂混合物运移及涌出的多种地质信息,获得不同模型试验水砂混合流运移通道中不同位置监测的水压力变化曲线,同时分析裂缝通道水砂流速度与通道宽度的关系,观测水砂流通道溢出口出砂量与时间的变化关系。

Based on the engineering geological modes of quicksand inrush induced by coal mining under the thin bedrock and thick unconsolidated formations,a test model of the mixed water and sand flow transfer and inrush was designed.The variation characteristics of water pressure in different position of the fissure channel were revealed by considering the various compositions of the flow and variations of the width of the fractured channel under the water pressure of 0.05 MPa and 0.10 MPa.Geological information of the mixed water and sand flow transfer for the various compositions of the flow,water pressure and the channel feature was quantitatively studied.The water pressure variation curves in the different positions were gained from different model tests.The relations between the channel width and the velocity of the mixed water and sand flow in the fractured channel were analyzed.The relationship between time and sand production volume of the mixed water and sand flow channel overflows was obtained from observational results.