Study on the Regularity of Ore Pressure in Overburden Hard Rock Working Face of Overburden Mining on Reverse Faults
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ORIGINAL PAPER
Study on the Regularity of Ore Pressure in Overburden Hard Rock Working Face of Overburden Mining on Reverse Faults Lianhai Tai . Shitan Gu . Zheng Liu . Tong Zou . Jiaxin Lu . Changpeng Chen
Received: 19 June 2020 / Accepted: 19 September 2020 Ó Springer Nature Switzerland AG 2020
Abstract In order to study the mining pressure on the upper coal seam in the fault, the working pressure of the working face with a hard rock roof is based on the production geological conditions of the 3301 working face of Yiqiao Coal Mine. Use flac numerical simulation software to establish a three-dimensional numerical calculation model of mining face, and study the distribution characteristics of mining plastic area, the advance support pressure and elastic strain energy density. And the change curve is treated by origin software fitting function. In the end, it was found that the total volume of the plastic zone and the propulsive distance of the working face showed an exponential function. Before and after the ‘‘first square’’, the total volume of the plastic zone increased more significantly, and the hard roof failure was mainly bending failures; There is a logarithmic function between the advance support pressure and the advancing distance of the working face. The range of 5–14 m in front of the coal wall is a region where the pressure increases L. Tai (&) S. Gu Z. Liu T. Zou J. Lu C. Chen State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China e-mail: [email protected] L. Tai S. Gu Z. Liu T. Zou J. Lu C. Chen College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
sharply. The elastic strain energy density appears relatively high. During the mining process, the advance support of the roadway should be strengthened, and the key monitoring should be carried out. If necessary, corresponding pressure relief measures should be taken to ensure the safe production of the working face. Keywords Reverse faults Plastic zone The advance support pressure Elastic strain energy density Numerical simulation
1 Introduction From the point of view of the occurrence of rock burst accidents, coal rock masses are often in high-stress areas, while coal rock masses in high-stress environments do not necessarily experience rock burst. Therefore, the high stress environment is the prerequisite for the impact of coal rock mass (Tan et al. 2019; Wang et al. 2019; Zheng et al. 2019; Jiang et al. 2014a, b; He et al. 2017). The stress state of coal and rock mass is affected by geological structure, which destroys the continuity of the rock layer, which makes the fault structure surface develop continuously, and finally leads to the singularity of the mining stress field. Many scholars at home and abroad have carried out extensive and in-depth studies on the appear
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