断层物质级配特征对渗流状态和非Darcy渗流参数影响研究  

Study on Influence to Seepage State and Non-Darcy Seepage Parameters by Graduation Characteristics of Fault Material

作　　者：于小军 马青海[1] 杨天鸿[1] 杨斌[1] 熊辉 黄梦龙 Yu Xiaojun;Ma Qinghai;Yang Tianhong;Yang Bin;Xiong Hui;Huang Menglong(School of Resources and Civil Engineering,Northeastern University)

机构地区：[1]东北大学资源与土木工程学院,沈阳市110819

出　　处：《勘察科学技术》2018年第5期15-21,共7页Site Investigation Science and Technology

基　　金：国家自然科学基金项目(U1710253)

摘　　要：预防断层突水引发的矿井灾害至关重要。该文针对这一问题利用一维非Darcy渗流试验系统和数值仿真软件COMSOL研究断层物质级配特征对非Darcy渗流参数的影响规律,分析了产生非Darcy流的临界条件,揭示了断层突水机制,为预防突水灾害提供了理论基础。研究结果表明:断层物质的级配特征对非Darcy渗流参数会产生重要影响,试样中颗粒尺寸越大或粗颗粒占比越大,介质渗透率和非Darcy影响因子越大;当混合试样中粗颗粒占比达到75%以上时,在一定渗流速度下会产生质量流失,这是引发突水的重要原因;在颗粒粒径大于0. 5mm的单一试样或粒径大于0. 5mm的颗粒占到20%以上的混合试样中,当渗流速度大于0. 03m/s时会产生非Darcy流。考虑断层物质颗粒的级配关系对研究矿山突水问题具有非常重要的现实意义。To prevent the mine disasters caused by fault water inrush is very important.In this paper,ac- cording to this problem,the one-dimensional non-Darcy seepage test system and numerical simulation soft- ware COMSOL are used to study the influence law of non-Darcy seepage parameters by fault material grada- tion.The critical conditions for producing non-Darcy flow are analyzed,and the mechanism of fault water inrush is revealed.It provides a theoretical basis for prevention of water inrush disasters.The results show that the graduation characteristics of fault material has an important effect on the non-Darcy seepage parameters.The larger particle size or the larger proportion of coarse particles in the sample,the greater permeability of medium and the non-Darcy flow influence factor.When the proportion of coarse particles in the mixed sample reaches to 75%,the mass loss will occur under certain seepage velocity,which is an important cause of water inrush.In a single specimen with particle size larger than 0.5mm or a mixed sample with particle size greater than 0.5mm accounting for more than 20%,when the seepage velocity is more than 0.03m/s,there will happen non-Darey flow.Considering the gradation relation of fault materi- al particles has important practical signficance to study the problem of water inrush in mines.

关 键 词：断层物质 非Darcy流 突水 粒经 颗粒级配 渗流状态 

分 类 号：TD745[矿业工程—矿井通风与安全]