砂岩吸水特性试验

为了研究砂岩吸水随时间的变化规律,利用深部软岩水理作用测试仪,对鹤岗南山矿深部和浅部砂岩进行了吸水试验,并通过粉晶X-射线衍射试验、压汞和SEM电镜扫描测试,分析了影响砂岩吸水特性的主要因素,建立了砂岩吸水过程函数.结果表明:无论是深部还是浅部砂岩,其吸水过程均具有时间效应,吸水速率随时间改变;吸水特征双对数曲线呈凸凹型和直线型.孔隙结构呈A类分形特征的砂岩,吸水速率变化较小,吸水特征双对数曲线多呈直线型,孔隙结构呈B、C类分形特征的砂岩,吸水速率变化较大,吸水特征双对数曲线多呈凹凸型.砂岩中矿物种类与含量、粒间孔隙中黏土矿物类型与产状均对吸水速率产生影响.

Experimental research on hydrophilic character istics of sandstone in deep mine

To bet ter understand hydr ophilic behavior s of sandsto ne in deep mine, a series of hy drophilic experiments o n sandstone samples located at deep mine of Nanshan coal-mine at Heg ang city o f China were carr ied out w ith the help of the hydrophilic test ing system in deep mine. Combining SEM technique w ith pow der diff ract ion analysis of X-ray and pr essure pump test s, main factors influering hydrophil ic characteristics w ere studied and the hydrophilic process funct io n of the sandstone w ere also o btained. The result s show that the hy dro philic process of the sandstone in deep mine v ar ies with t ime, that the hydr ophilic relatio nship w ith t ime can be expressed by dual lo garithm characterized by kinds of modes such as co nvex , co ncave and l inear ones, that hydr ophilic rate o f the sandstone w ith A-type fractal micro st ructure chang es slig ht ly w ith t ime, and the dual logarithm function of hy dro philic process can be taken as linear, and that the hy drophilic r ate o f those w ith B and C-type fractal microst ructure changes great ly and is alw ays taken as co ncave-convex. It can be noted that the mineral ing redient s and their co ntent , porosities, and microst ructures of clay minerals all have influence on soakag e and hydrophilic rate for sandsto ne.