文献类型：期刊文献

英文题名：Mechanism of Secondary Breakage in the Overlying Strata during Repetitious Mining of an Ultrathick Coal Seam in Design Stage

作者：Li, Hui Zhang, Dongsheng Jiang, Shuyin Fan, Gangwei Xu, Mengtang

第一作者：Li, Hui

通信作者：Zhang, DS[1]

机构：[1]China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China;[2]China Natl Coal Grp Corp, Xinjiang Branch, Urumqi 830011, Peoples R China;[3]China Univ Min & Technol, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;[4]Guizhou Inst Technol, Sch Min Engn, Guiyang 550003, Guizhou, Peoples R China

第一机构：China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China

通信机构：corresponding author), China Univ Min & Technol, State Key Lab Coal Resources & Safe Min, Xuzhou 221116, Jiangsu, Peoples R China.

年份：2019

卷号：2019

外文期刊名：ADVANCES IN CIVIL ENGINEERING

收录：;Scopus(收录号：2-s2.0-85062368554);WOS:【SCI-EXPANDED(收录号:WOS:000458961900001)】；

基金：This work was supported by the National Basic Research Program (grant no. 2015CB251600) and the National Natural Science Foundation of China (grant no. 51264035).

语种：英文

摘要：When designing the mining of an ultrathick coal seam, the laws governing movement in the overlying strata during mining are a fundamental issue based on which several problems are addressed, including determining the mining method and the roadway arrangement, controlling the surrounding strata, and selecting the devices. The present paper considers possible problems related to strata overlying a large mining space subjected to repeated disturbances during the mining of an ultrathick coal seam, including repeatedly broken strata and the existence or inexistence of the structure. The B-M coal seam in the No. 2 coal mine of the Dajing mining area in the East Junggar coalfield is studied. Physical simulations are performed on the movements of the overlying strata during slicing mining of the ultrathick coal seam, revealing the new feature of break-joint stability-instability-secondary breakage in the overlying strata. Mechanical models are constructed of the secondary breakage of the overlying strata blocks under both static and impact loading, and mechanical criteria are proposed for such breakage. Based on the research findings, methods for controlling the surrounding strata during slicing mining of an ultrathick coal seam are proposed, including increasing the mining rate and designing reasonable heights for the slicing mining.