文献类型：期刊文献

英文题名：A new model for the identification of subcritical surface subsidence in deep pillarless mining

作者：Pan, Ruikai Li, Yong Wang, Hui Chen, Jie Xu, Youlin Yang, Hongyun Cao, Shugang

第一作者：Pan, Ruikai

通信作者：Li, Y[1]

机构：[1]Shanxi Inst Energy, Dept Min Engn, Jinzhong 030600, Peoples R China;[2]Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China;[3]Guizhou Inst Technol, Coll Min Engn, Guiyang 550003, Peoples R China;[4]Chongqing Jiaotong Univ, Coll Civil Engn, State Key Lab Mt Bridge & Tunnel Engn, Chongqing 400074, Peoples R China

第一机构：Shanxi Inst Energy, Dept Min Engn, Jinzhong 030600, Peoples R China

通信机构：corresponding author), Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.

年份：2021

卷号：129

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20213210748534);Scopus(收录号：2-s2.0-85112667604);WOS:【SCI-EXPANDED(收录号:WOS:000700586800003)】；

基金：This research was supported by the Graduate Research and Innovation Foundation of Chongqing, China (CYB18032), the Fundamental Research Funds for the Central Universities (2020CDJQY-A046 and 2020CDJ-LHZZ-004), the State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287-MS201903), the Natural Science Foundation of Chongqing (cstc2020jcyj-msxmX0570), the National Natural Science Foundation of China (51904043 and 51764010). The authors also thank Longtan Coal Mine for support and assistance during field measurement and observation, in particular, Yuan Weiqiang.

语种：英文

外文关键词：Longwall mining; Surface subsidence; Key strata; Subsidence prediction; Pillarless mining

摘要：The identification of the subsidence stage is vital for the surface infrastructure protection above underground mining panels, while prior studies have only focused on shallow mining with large interpanel pillars. In this study, we aimed to develop a new model to identify the initiation of subcritical subsidence in deep pillarless mining. The key stratum theory was used to transform the problem of stage identification for surface subsidence into the primary key stratum (PKS) failure. The findings show that the PKS in deep mining can remain stable after a single panel is extracted. The narrow pillar gradually loses its structural integrity and fails to isolate the movement of PKS above two panels as the second panel passes it. Consequently, the PKS above two panels integrally fails as an L-shaped plate, causing the transition from super-subcritical to subcritical subsidence stage. According to these findings, the L-shaped PKS model was developed using the theory of elastic plates to determine the critical span of PKS failure and identify the occurrence of subcritical subsidence in pillarless mining. The model was validated using a three-year field measurement data on surface subsidence in Longtan coal mine. This study contributes to the understanding of subsidence mechanism in deep pillarless mining and provides new insight into designing pillarless mining with surface subsidence control.