突水过程中颗粒运移对破碎砂岩水力特性影响试验研究  

Experimental study on effects of particle migration on hydraulic characteristics of crushed sandstone during water inrush

作　　者：陈学文[1] 吕闰生[2] CHEN Xuewen;LYU Runsheng(Henan Technical College of Construction,Zhengzhou 450064,China;Institute of Resources&Environment,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南建筑职业技术学院,河南郑州450064 [2]河南理工大学资源环境学院,河南焦作454003

出　　处：《中国矿业》2021年第6期184-188,共5页China Mining Magazine

摘　　要：为揭示破碎带条件下的煤矿突水机理,本文利用自发研制的破碎岩体颗粒运移试验系统,开展了一系列突水室内试验,探讨了突水过程中颗粒运移对破碎带砂岩水力特性变化规律及其影响因素。试验结果表明:破碎砂岩渗透率随时间的变化可分4个阶段:震荡增长阶段、快速增长阶段、缓慢增长阶段、稳定阶段;初始孔隙率和水压对试样最终渗透率和孔隙率的大小具有较大影响,数值模拟显示颗粒运动方向大体朝裂缝方向聚集并伴随有局部范围内的涡流现象;颗粒的迁移、排出是导致破碎带煤矿突水的本质因素。研究结果进一步加深了对破碎带条件下煤矿水害问题的认识和理解,对突水问题的发生机理具有一定的补充作用。To study the mechanism of water inrush in coal mine under the condition of fracture zone,a series of indoor tests of water inrush are carried out by using the self-developed particle migration test system of fractured rock mass,and the variation law and influencing factors of particle migration on the hydraulic characteristics of sandstone in fracture zone in the process of water inrush are discussed.The results show that the permeability of crushed sandstone can be divided into four stages,which oscillatory growth stage,rapid growth stage,slow growth stage and stable stage.The initial porosity and water pressure have a great influence on the final permeability and porosity of the sample.The numerical simulation shows that the particle movement direction is generally towards the fracture direction,accompanied by local eddy current phenomenon.The migration and discharge of particles are the essential factors leading to water inrush in fractured zone.The research results further deepen the understanding of coal mine water disaster under the condition of fracture zone,and have a certain supplementary effect on the occurrence mechanism of water inrush.

关 键 词：煤矿突水 颗粒运移 破碎砂岩 渗透率 孔隙率 

分 类 号：TD745[矿业工程—矿井通风与安全]