Safety and Protection Measures of Underground Non-Coal Mines with Mining Depth over 800 m: A Case Study in Shandong, China

Li Cheng, Qinzheng Wu, Haotian Li, Kexu Chen, Chunlong Wang, Xingquan Liu, Xuelong Li () and Jingjing Meng
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Li Cheng: Deep Mining Laboratory of Shandong Gold Group Co., Yantai 264000, China
Qinzheng Wu: Deep Mining Laboratory of Shandong Gold Group Co., Yantai 264000, China
Haotian Li: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Kexu Chen: Deep Mining Laboratory of Shandong Gold Group Co., Yantai 264000, China
Chunlong Wang: Deep Mining Laboratory of Shandong Gold Group Co., Yantai 264000, China
Xingquan Liu: Deep Mining Laboratory of Shandong Gold Group Co., Yantai 264000, China
Xuelong Li: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Jingjing Meng: Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, Sweden

Sustainability, 2022, vol. 14, issue 20, 1-16

Abstract: With the increase in mining depth, the risk of ground pressure disasters in yellow gold mines is becoming more and more serious. This paper carries out a borehole test for the pressure behavior in a non-coal mining area with a mining depth of more than 800 m in the Jiaodong area. The test results show that under a depth of 1050 m, the increase in the vertical principal stress is the same as the increase in the minimum horizontal principal stress, which is about 3 MPa per 100 m. When the depth increases to 1350 m, the vertical principal stress increases by about 3% per 100 m, and the self-weight stress and the maximum horizontal principal stress maintain a steady growth rate of about 3 MPa per 100 m. In addition, based on the test results, the operation of the ground pressure monitoring system in each mine is investigated. The investigation results show that in some of the roadway and stope mines with depths of more than 800 m, varying degrees of rock mass instability have occurred, and a few mines have had sporadic slight rockbursts, accounting for about 5%. There was a stress concentration area in the lower part of the goaf formed in the early stage of mining, and slight rockburst phenomena such as rock mass ejection have occurred; meanwhile, the area stability for normal production and construction was good, and there was no obvious ground pressure. This paper compares the researched mines horizontally as well as to international high-level mines and puts forward some suggestions, including: carrying out ground pressure investigations and improving the level of intelligence, which would provide countermeasures to balance the safety risks of deep mining, reducing all kinds of safety production accidents and providing a solid basis for risk prevention and supervision.

Keywords: non-coal mine; great mining depth; ground pressure disaster; safety investigation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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