1 School of Energy and Engineering,Henan Polytechnic University,Jiaozuo ,China；2 State Key Laboratory of Groundwater Protection and Utilization in Coal Mining,China Energy Group,Beijing ,China；3 School of Civil Engineering,Henan Polytechnic University,Jiaozuo ,China

为了研究西部矿区浅埋煤层采动破碎岩体诱发的突水溃沙灾害机理,根据两相流相关理论,分析了破碎岩体水沙两相渗流的特征及适用理论模型,提出了破碎岩体水沙两相渗流主要渗透特性参量,研究了破碎岩体水沙两相渗透特性参数的提取方法及不同粒径破碎岩体渗透特性参数变化规律。研究结果表明:(1)破碎岩体水沙两相渗流为典型的非Darcy渗流、非Newton流体,适宜采用双流体连续介质模型;(2)破碎岩体水沙两相渗流特性主要参数为流度、非Darcy流β因子和加速度系数;(3)在沙相压力梯度构造时间序列和渗流速度时间序列基础上,结合数值分析等方法可以有效提取水沙两相渗透特性参数;(4)随着破碎岩体粒径增大,水沙两相非Darcy流β因子和加速度系数随之减小,流度随之增加。

In order to study the mechanism of water-sand inrush disaster Caused by the mining-induced crushed rock mass in shallow coal seam in western mining area,based on the two phase flow theory,the paper analyzed the characteristics of two phase water-sand flow in crushed rock mass and the suitable theoretical model,put forward the basic seepage parameters for two phase water-sand flow in crushed rock mass,researched the extraction method for the seepage parameters and the change rule of seepage parameters in different particle size.The research results indicate that the two phase flow continuum model is fittingly employed to analyze the two phase water-sand flow in crushed rock mass,which belongs to the non-Darcy seepage and non-Newton fluid；the basic characteristic parameters in two phase water-sand flow contain fluidity,non-Darcy β factor,and acceleration coefficient ca；combined with the numerical analysis,the basic parameters in two phase water-sand flow are effectively extracted,on the basis of sand phase pressure gradient time series and seepage velocity time series；as the increase of particle size of crushed rock mass,the non-Darcy β factor and acceleration coefficient decrease,while the fluidity augments.

国家自然科学基金青年科学基金资助项目(51704095,51774110)；国家能源集团煤炭开采水资源保护与利用国家重点实验室开放基金资助项目(SHJT-16-30.11)；