Study on multi-field catastrophe evolution laws of water inrush from concealed karst cave in roadway excavation: a case of Jiyuan coal mine

Geomatics, Natural Hazards & Risk

Zijie Liu¹  Xianqing Wang¹  Bo Li²  Tao Li³ 

[1] College of Resource and Environmental Engineering, Guizhou University;Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University;School of Mines and Civil Engineering, Liupanshui Normal University;

关键词: excavation roadway;    water-filled karst cave;    water inrush;    multi-field evolution law;    fluid-structure interaction;   

DOI  :  10.1080/19475705.2020.1870170

来源: DOAJ

【 摘 要 】

Coal is the major energy source in China. Many coal mines in Southwest China have arranged the excavation roadway system in the Maokou limestone in coal seam floor because of its special hydrogeological conditions. Since karst is widely distributed in Maokou limestone and water-filled karst caves are also developed commonly there, once a strongly water-filled karst cave is exposed during roadway excavation, the water inrush disaster occurs easily. In order to reveal the phenomenon of water inrush disasters from covered karst caves more effectively, the water inrush that occurred during the roadway excavation process of Jiyuan coal mine in northern Guizhou was taken as a research object in this study. Based on the regional geological structure, the hydrogeological condition and the fluid-structure interaction theory, a fluid-structure interaction model of water inrush in the roadway excavation was established, and variation laws of stress field, displacement field and seepage field of surrounding rock during the process of water inrush from karst cave were analyzed. Besides, the influence of different geological conditions on water inrush from karst cave was discussed from aspects of the size of karst cave, the water pressure of karst cave and the thickness of aquiclude.

【 授权许可】

Unknown