Journal
GEOMATICS NATURAL HAZARDS & RISK
Volume 12, Issue 1, Pages 222-243Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/19475705.2020.1870170
Keywords
Excavation roadway; water-filled karst cave; water inrush; multi-field evolution law; fluid-structure interaction
Funding
- National Natural Science Foundation [41702270]
- Guizhou Science and Technology Department Project [Qian Ke He Ji Chu [2019]1413, Qian Ke He Zhi Cheng [2020]4Y048, Qian Ke He Zhi Cheng [2020]4Y007, [2017]5788]
- Guizhou Provincial Department of Education Foundation [[2018]113]
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This study focused on the water inrush disasters during the roadway excavation process of Jiyuan coal mine in northern Guizhou, and established a fluid-structure interaction model to analyze the variation laws of surrounding rock during water inrush from karst cave. The influence of different geological conditions on water inrush from karst cave was also discussed.
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.
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