破碎煤岩体化学注浆堵水技术研究及示范工程

Technology Research of Chemical Grouting for Cracked Coal-Rock Mass and Demonstration Project

从煤岩体的裂隙分布、渗流水力学特征与化学注浆堵水机理出发,详细分析了渗透水裂隙的形成及分类、破碎煤岩体注浆堵水作用机理;论述了岩体渗透系数与应力、温度的关系,水压与注浆压力的关系,岩体的可注性以及注浆位置选取与钻孔深度的关系。通过对屯留煤矿南翼进风大巷的顶板水封堵工程的实例分析,说明化学注浆堵水可借助深部开裂程度较低的围岩裂隙实施,形成隔水帷幕;涌水量大的厚层富含水破碎顶板由深部向浅部后退式注浆工艺,可显著提高注浆堵水效果,降低材料消耗和工程成本。

On the basis of the fracture distribution of coal-rock mass, infiltration flow mechanical characters and the mechanism of grouting to block up flow, the paper analyses the reasons of formation and classification of infiltration water fractures, and the mechanism of cracked coal-rock mass＇s grouting to cut-off water, and discusses the relations between permeability coefficient, stress and temperature, between water pressure and grouting pressure and between groutability of rockmass, grouting position and drill hole depth. At last, the paper alanyses a project example that describes grouting to cut-off the flow in the roof of an air intake roadway of southern part of Yanliu Mine, the result indicates that, through grouting into surrounding rock with low fracture level in depth, a grout curtain to cut off infiltration flow might be formed, and that a fallback grouting from deep to shallow into cracked roof with abundant water was conducted, thus, the effect of above two kinds of grouting was obviously improved, at the same time, the consumption of raw material and project cost were reduced.