论文部分内容阅读
采用自主开发研制的软岩膨胀试验装置,对新生代煤系地层中泥质岩进行膨胀试验研究,分析了泥质岩膨胀各向异性以及循环胀缩特性,并结合SEM试验结果,探讨了膨胀各向异性和循环胀缩特性的形成机制。结果表明:泥质岩膨胀性随岩样端面与层理面夹角的增大而减小,具有明显的各向异性;泥质岩所含黏土矿物颗粒排列的择优取向导致了泥质岩吸水膨胀的各向异性,可通过膨胀各向异性系数进行定量描述;随着干湿循环次数的增加,泥质岩绝对膨胀率增加,趋于某一稳定值;相对膨胀率和相对收缩率降低,亦趋于某一稳定值;泥质岩循环胀缩特性是干湿循环过程中矿物颗粒排列方式改变和微裂隙萌生扩展的能量耗散共同作用的结果。
The self-developed soft rock expansion test device was used to expand the argillaceous rocks in the Cenozoic coal measure strata. The anisotropy of expansion and cyclic expansion and contraction of argillaceous rocks were analyzed. The SEM Formation Mechanism of Anisotropy and Cyclic Shrinkage. The results show that the expansivity of shale decreases with the increase of the included angle between the end face and bedding plane of rock specimen, and has obvious anisotropy. The preferred orientation of clay mineral particles contained in shale leads to the absorption of mudstone The anisotropy of swelling can be quantitatively described by the coefficient of expansion anisotropy. With the increase of the number of wetting and drying cycles, the absolute swelling rate of mudstone increases and tends to a certain stable value. The relative expansion and relative shrinkage decrease, Also tends to a certain stable value; the cyclic swelling and shrinkage characteristics of argillaceous rocks are the result of the interaction of energy dissipation and the change of the arrangement of mineral grains and the initiation and propagation of micro-cracks during the wet-dry cycle.