摘要
为有效防治深部小断层活化产生的突水灾害,对开采过程中深部小断层岩体的受力进行了分析,指出煤层顶板覆岩对小断层上部的张拉作用力和工作面前方支承压力对底板小断层的剪切作用力,对小断层的活化起到了主要诱发作用;推导出小断层岩体裂隙的起裂和扩展判据。结合自主研发的高水压底板突水相似模拟试验系统,对深部小断层岩体裂隙的演化规律进行了试验研究。结果表明:小断层岩体距煤层越近,其上、下盘受到的应力差较大,小断层活化的可能性越高;煤层开采期间,小断层上盘产生了一条与断层面平行的剪切裂隙,加速了断层的活化。因此,要及时做好深部底板附近小断层岩体的破裂监测,有效预防小断层岩体活化形成突水通道。
In order to effectively prevent the deep water inrush disaster induced by small fault activation, the load of deep small fault during the mining period was analyzed. It is indicated that there are main two force, which is the tension force on the up-per small fault from overlying strata and the shear force on small fault under floor from abutment pressure ahead of working face, playing a key role in fault activation; the criterions of crack initiation and propagation were deducted. Applying with inde-pendently developed test system to simulate floor water inrush with high water pressure, the evolution law of deep small fault crack was analyzed by inverting the change law of its stress and displacement. The results show that the closer to coal seam of small fault, the bigger stress difference of fault hanging wall and footwall, and the higher possibility of fault activation. During the mining process, a piece of shear crack paralleling to fault plane appeared in the hanging wall of small fault, which acceler-ated the fault activation. Therefore, the fracture monitoring of shallow small fault under coal seam should be carried out in time of deep mining to effectively prevent fault activation to form water inrush channels.
作者
陈军涛
谭文峰
马凯
王自起
CHEN Juntao;TAN Wenfeng;MA Kaiz;WANG Ziqi(College of Geosciences and Surveying Engineering,China University of Mining and Technology（Beijing）,Beijing 100083,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Shandong Energy Xinwen Group Xin Julong Co.,Ltd,Heze,Shandong 274918,China)
出处
《矿业研究与开发》
CAS
北大核心
2018年第8期23-27,共5页
Mining Research and Development
基金
国家自然科学基金资助项目(51604167)
中国博士后科学基金资助项目(2016M601171)
矿山灾害预防控制省部共建国家重点实验室培育基地开放课题基金项目(MDPC2016ZR01)
关键词
小断层
高应力
裂隙演化
断层活化
Small fault
High stress
Crack evolution
Fault activation
