深部煤系软岩遇水崩解的宏观特征及微观机理研究

      随着煤层开采层位的加深，对煤系软岩水稳性的研究越来越重要。巨野3号煤顶底板岩层以泥质岩为主，赋存深度900～1200 m，为典型的深部煤系软岩。通过水理性试验、X射线衍射试验及电镜扫描试验，对巨野煤田深部煤系软岩遇水崩解的宏观特征及微观机理进行分析研究。研究发现软岩水稳性较差，浸水后在30 min内开始崩解；岩样粘土矿物以高岭石及蒙伊混层为主，结构上表现为明显的疏松性及定向排列性。通过分析认为深部煤系软岩崩解是粘土矿物内外膨胀联合作用的结果，其中软岩结构特征是导致该类岩石遇水崩解的主要因素。

Research on Macro Features and Micro-mechanism of Deep Coal Soft Rocks Degradation in Water

With the development of deep coal resources, research on the water stability of soft rocks containing coals becomes
very important. In Juye Coal field, the roof rocks and floor soft rocks, mainly consists of mudstone at 900-1200m below surface,
is typical soft rocks for deep coal. The macro features and micro cale degradation mechanism of deep coal soft rocks in water in
Juye Coal Field have been analyzed by water stability experiment, X-ray diffraction and scanning electron microscopy. The result
shows that the water stability of soft rocks is poor, and soft rocks startet to disintegrate in 30 minutes after being soaked. The
clay minerals of the rock samples, mainly kaolinite and illite/montmorillonite interstratified, show significantly osteoporotic and
alignment in structure. The degradation of deep coal soft rocks is due to the expansion of clay minerals inside and outside through the analysis, and the main factor that leads to poor water stability of rock samples is the structural features of soft rocks.