地质力学学报2024，Vol.30Issue(3)：473-486,14.DOI:10.12090/j.issn.1006-6616.2023094
山东龙郓煤业10·20冲击地压事故区域应力背景与防控研究
Study on regional stress background and prevention of the rock burst accident on October 20th,2018 in the Longyun Coal Industry area,Shandong,China
摘要
Abstract
[Objective]The stability of underground chambers such as mine tunnels and transportation tunnels is closely related to the stress environment of the surrounding rock mass and the geological conditions of the area.Analyzing the relationship between deep-seated stress and factors such as the orientation and shape of underground chambers can help to proactively mitigate the risks associated with chamber excavation.[Methods]This study,set against the background of the rock burst accident on October 20th in the Longyun Coal Industry area in Shandong,reveals the current stress environment of the shallow crustal layers in western Shandong through in-situ stress measurement and monitoring work.[Results]According to the characteristics of the current ground stress field near the Longyun coal mining area,the study investigates the regional stress background that led to the rock burst accident and proposes corresponding prevention and control suggestions from the perspective of ground stress.The results indicate that the magnitude of the principal stress generally increases linearly with depth within the measurement range,with the maximum horizontal principal stress ranging from 3.48 to 20.76 MPa and a gradient of 0.0182 MPa/m with increasing depth,while the minimum horizontal principal stress ranges from 3.44 to 14.95 MPa with a gradient of 0.0130 MPa/m.The maximum horizontal principal stress azimuth in the area ranges from NE 43°to 89°,with an average azimuth of NE 75°.The tectonic action in the shallow crust is mainly horizontal,but with increasing depth,they gradually transition to vertical.[Conclusion]The triggering mechanism of the rock burst accident in the Longyun Coal Industry area on 20th October is primarily attributed to the vertical stress exceeding the horizontal principal stress,indicating a current extensional stress environment,especially when the tunnel orientation is parallel to the direction of maximum horizontal principal stress.It is suggested that the angle between the tunnel axis and the direction of maximum horizontal principal stress in the Longyun Coal Industry area should be between 60°and 90°,and that the tunnel roof can be designed as an arch-shaped roof to ensure the stability of the tunnel rock mass.关键词
山东西部/冲击地压/地应力测量与监测/地应力场特征/岩体稳定性Key words
western shandong/rock burst/in-situ stress measurement and monitoring/ground stress field characteristics/rock mass stability分类
天文与地球科学引用本文复制引用
孟静,张鹏,王继明,丰成君,范玉璐,戚帮申,孙明乾..山东龙郓煤业10·20冲击地压事故区域应力背景与防控研究[J].地质力学学报,2024,30(3):473-486,14.基金项目
中国地质调查局地质调查项目(DD20190317,DD20221738,DD20230540) （DD20190317,DD20221738,DD20230540）
国家自然科学基金项目(U2244226) （U2244226）
中国地质科学院地质力学研究所基本科研业务费项目(DZLXJK202305)This research is financially supported by the Projects of the China Geological Survey(Grants No.DD20190317,DD20221738,and DD20230540),the National Natural Science Foundation of China(Grant No.U2244226),and the Reasearch Fund of the Chinese Academy of Geological Sciences(Grant No.DZLXJK202305). （DZLXJK202305）
