CAJ | 학술논문

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。
채용자주개발연제적연암팽창시험장치，대신생대매계지층중니질암진행팽창시험연구，분석료니질암팽창각향이성이급순배창축특성，병결합SEM시험결과，탐토료팽창각향이성화순배창축특성적형성궤제。결과표명：니질암팽창성수암양단면여층리면협각적증대이감소，구유명현적각향이성；니질암소함점토광물과립배렬적택우취향도치료니질암흡수팽창적각향이성，가통과팽창각향이성계수진행정량묘술；수착간습순배차수적증가，니질암절대팽창솔증가，추우모일은정치；상대팽창솔화상대수축솔강저，역추우모일은정치；니질암순배창축특성시간습순배과정중광물과립배렬방식개변화미렬극맹생확전적능량모산공동작용적결과。
In order to grasp the swelling characteristics of argillaceous rock from coal measure strata in Cenozoic era, a self-developed soft rock swelling experiment apparatus is used to analyze swelling anisotropy and cyclic swelling-shrinkage. The essential mechanisms of swelling anisotropy and cyclic swelling-shrinkage of argillaceous rock are discussed by using scanning electron microscope (SEM). Results show that the swelling of argillaceous rock decreases with an increase angle between the horizontal plane of device and bedding plane of specimen, and has obvious anisotropy. The anisotropy property of argillaceous rock swelling with water is caused by the preferred orientation of clay mineral particles arrangement, and it can be quantitative described by swelling anisotropy coefficient. With the increase of wetting-drying cycles, absolute swelling ratio increases and tends to be stable, but relative swelling and relative shrinkage ratios decrease and stabilize. Cyclic swelling-shrinkage of argillaceous rock is the outcome of combined effect, which is alter of arrangement of mineral particles and energy dissipation during the occurrence and development of micro-cracks.