摘要
为揭示煤系地层中逆断层的形成过程,利用UDEC6.0数值模拟软件,根据逆断层形成的力学机制,研究了逆断层形成过程中岩层变形破坏特征、应力演化及位移变化规律,并对逆断层产状影响因素进行了分析。结果表明:煤系地层中逆断层形成过程可分为岩层压缩、起裂发育、断层贯通、两盘滑移、整体稳定5个阶段;逆断层形成后,近断层处岩层仍存在较高的水平构造应力;以断层为界,逆断层形成后上盘岩层的位移较大,且在靠近断层处变化幅度最大,而下盘岩层位移基本未发生变化;逆断层产状与水平加载速率和地层深度有关,水平加载速率越大,上盘岩层的竖向位移越大,逆断层发育越快,而随着地层深度的增大,上盘岩层竖向位移越小,两盘错动滑移量也越小,不易于逆断层的发育。
In order to reveal the formation process of reverse faults in coal strata,the deformation characteristics,stress evolution and displacement variation of rock strata in the formation process of reverse faults were studiedbyUDEC6.0 based on the formation mechanism of reverse faults.And the influencing factors on the occurrence of reverse faults were analyzed.The results showed that the formation process of reverse faults in coal strata can be divided into five stages:rock compression,initiation and development,fault penetration,two-wall slip,as well as overall stability.After forming the reverse faults,high horizontal tectonic stress existed in rock strata near the faults.With the fault as the boundary,the displacement at the upper wall rock layer was large after forming reverse faults.And the variation was the maximum near the faults,while the displacement at the lower wall rock layer basically unchanged.The occurrence of reverse faults was related to the horizontal loading rate and the stratum depth.The larger the horizontal loading rate,the larger the vertical displacement at the upper wall strata and the faster the development of reverse faults.With the increase of stratum depth,the smaller the vertical displacement at the upper wall strata and the smaller the dislocation slip at two walls,which hindered the development of reverse faults.
作者
李志远
陈绍杰
任梦梓
夏治国
张鑫源
LI Zhiyuan;CHEN Shaojie;RENM engzi;XIA Zhiguo;ZHANG Xinyuan(State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Provence and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, Shandong 266590, China)
出处
《矿业研究与开发》
CAS
北大核心
2019年第10期131-137,共7页
Mining Research and Development
基金
国家自然科学基金项目(51774194)
山东省自然科学杰出青年基金资助项目(JQ201612)
泰山学者工程专项经费资助项目
关键词
煤系地层
逆断层
形成过程
构造应力
产状
影响因素
Coal strata
Reverse fault
Formation process
Tectonic stress
Occurrence
Influencing factors
