新疆乌鲁木齐河马泉片区软岩膨胀特性判别

Determination of Soft Rock Expansion Characteristics in Hemaquan Area of Urumqi

通过岩石X衍射试验对蒙脱石以及其他黏土矿物的相对含量的测定和电镜扫描的岩石的微观特征中薄片状晶体的存在以及岩石裂隙的发育,从定量和定性两方面相结合揭示河马泉片区的岩石膨胀特性。X衍射试验结果矿物成分含量结合电镜扫描试验结果合理的解释了河马泉片区软岩的崩解膨胀甚至泥化的现象。进一步量化了河马泉片区岩石的膨胀性能的大小,通过无荷载作用下的自由膨胀率试验,进而表明岩样自由膨胀率基本达30%~40%,有的甚至高达103%。并探究了自重应力与自由膨胀率的关系,结果表明自由膨胀率与自重应力的基本无相关性。

This paper presents the qualitative and quantitative testing results of expansion characteristics of rock samples by testing the relative content of montmorillonite and other clay minerals in the rock samples from Hemaquan Area by X-ray diffraction test and the existence of lamellar crystals and the development of rock fractures in the microscopic characteristics of rock samples.The results of X-ray diffraction test and the content of mineral composition combined with the results of electron microscope scanning test reasonably explain the phenomenon of disintegration,expansion and even argillization of the soft rock in Hemaquan area.In order to further quantify the expansion performance of rocks in Hemaquan area,through the free expansion rate test without load,the test shows that the free expansion rate of rock samples is basically 30%-40%,and some are even as high as 103%.The results show that there is no correlation between the free expansion rate and the self-weight stress.