荣华矿深部岩石吸水特性

Hydrophilic characteristics of rock at depth of Ronghua mine

为研究深部岩石吸水特性,以鸡西荣华矿深部粗中砂岩(CS)、细砂岩(XS)和泥质粉砂岩(NS)为研究对象,采用浸泡法进行吸水实验,并结合X射线衍射和扫描电镜方法分析三组岩石的矿物成分、吸水特性及水对其微观结构的影响。结果表明:荣华矿深部岩石以石英、长石和黏土矿物为主。三组岩石的吸水率均随吸水时间的增加而增大,吸水过程特征曲线呈三次和四次多项式型。吸水实验初期岩石的吸水速率由孔隙大小和连通性决定,5～10 d后吸水速率由黏土矿物膨胀的微孔数量及其连通性改善情况决定。岩石结构松散、黏土矿物含量低,吸水速率和吸水率高;岩石结构致密、黏土矿物含量高,吸水速率和吸水率低。该结果可为岩石吸水软化机理研究提供依据。

This paper is an attempt to investigate hydrophilic characteristics of the deep rocks consisting of gritstone,finestone and siltstone found in the deep Ronghua mine.The investigation involves performing experiments using water immersion method and analyzing the effect of water absorption characteristics, minerals and water of three groups of rocks on micro-structure,using the water immersion test, combined with X-ray diffraction and scanning electron microscope.The analysis shows that the deep rocks occurring in Ronghua mine consists primarily of quartz,feldspar,and clay mineral.The water absorption rate of three groups of rocks increases with the increasing time and water absorption characteristic curve meet three and four polynomial.The initial water absorption rate is determined by the pores of rocks the size and connectivity and following five to ten day,water absorption rate is determined by the number and improved connectivity of expanding porous clay minerals.Loose rock structure and low content of clay minerals give rapid water absorption rate and high water absorption.Dense rock structure and high content of clay minerals give slow absorption rate and low water absorption.The result provides the basis for the research on the water-absorbing and softening mechanism of the rocks.