Deformation and Failure Characteristics of Overburden Under Thin Bedrock and Thick Alluvium: A Case Study in Baodian Coa
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ORIGINAL PAPER
Deformation and Failure Characteristics of Overburden Under Thin Bedrock and Thick Alluvium: A Case Study in Baodian Coal Mine Yun Wu . Zhen Huang . Xiao-Zhao Li . Chun-Lu Jiang
Received: 14 December 2019 / Accepted: 11 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract Underground mining will lead to deformation and failure of overburden and frequently associated with water inrush. In view of the special situation of No.8 mining area in Baodian Coal Mine (thin bedrock and thick alluvium). According to geological engineering characteristics and overlying lithified strata, different bedrock height models were established using physical and numerical simulation. The deformation and failure of overburden, mininginduced stress, and height of the caving zone are then studied using these models. The results show that mining-induced stress is different in overburden and clay, with a large variation near the rock and clay
Y. Wu (&) X.-Z. Li School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, People’s Republic of China e-mail: [email protected] Z. Huang (&) School of Resources and Environment Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, People’s Republic of China e-mail: [email protected] X.-Z. Li Sino Probe Center, Chinese Academy of Geological Sciences, No. 26 Baiwanzhuang Street, 100037 Beijing, People’s Republic of China C.-L. Jiang School of Resources and Environmental Engineering, Anhui University, Hefei 230601, People’s Republic of China
layers. Findings also illustrate that the clay layer has an inhibitory effect on mining-induced stress. The height of the caving zone increases with the height of the bedrock, and the height of the caving zone obtained by physical and numerical simulation are similar. Through the comprehensive comparison of the height of the caving zone, it can be inferred that the height of the caving zone does not reach the thinnest position of the bedrock and no large water inrush will occur. The results obtained in this study provide an important framework for the study of coal mining safety under similar geological conditions in other locations. Keywords Thick alluvium Thin bedrock Deformation and failure Physical simulation Numerical simulation
1 Introduction Numerous geological hazards can be encountered in underground engineering construction. Particularly in underground coal mines, the deformation and failure of overlying strata can have disastrous consequences in cases where the working face is beneath thin bedrock and thick alluvium. Many coal fields in the north and east of China are covered with alluvium (typically 30–400 m). The North China Baodian Coal Mine has been in use for over 20 years, with many
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Geotech Geol Eng
sections of the mine completely extracted. Shallow mining contributes to the sustainability of the mine and is an important measure to maximize the recovery of coal resources. To ensure the safety of mine production, the
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