Stability Control of the Equipment Recovery Passage in a Fully Mechanized Longwall Mining: Case Study
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ORIGINAL PAPER
Stability Control of the Equipment Recovery Passage in a Fully Mechanized Longwall Mining: Case Study Zhiyi Zhang . Hui Chen . Dongfa Li . Zhiqiang Zhang
Received: 25 April 2020 / Accepted: 17 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract Equipment recovery passage (ERP) is being widely employed in longwall panel for the purpose of recovering heave mining equipment at the end of mining stage. The stability of the ERP, however, is always difficult to control although powerful supporting structures are employed, which restricts its further promotion. In the present paper, we focused on the ERP’s stability control through reducing the abutment stress imposed on the ERP’s surroundings rather than solely increasing roadway support intensity, based on a rigorous case study in China. First, the dynamic evolution of the abutment stresses, corresponding plastic zone and deformations in the surrounding rock of the ERP were analyzed through a meticulously validated FLAC3D numerical simulation, as the longwall face moved with different velocity. The simulated results indicate that the faster the longwall face moved, the lower the abutment Z. Zhang H. Chen Z. Zhang (&) College of Geological and Mining Engineering, Xinjiang ¨ ru¨mqi 830047, China University, U e-mail: [email protected] Z. Zhang e-mail: [email protected] H. Chen e-mail: [email protected] D. Li Shajihai Coalmine, Hefeng Coal and Electric Company of Shenhua Group, Tacheng 834411, China e-mail: [email protected]
stresses, the narrower the plastic zone and the smaller the deformations were. In terms of these analyses, two suggestions were proposed, including increasing longwall face moving velocity and roof structure optimization, and corresponding technologies were introduced, and potential effect were verified as well. Conclusions and suggestions of this paper might be helpful for increasing the flexibility of the ERP in similar geotechnical conditions. Keywords Equipment recovery passage (ERP) Longwall face moving velocity (LFMV) Stability control Longwall mining FLAC3D numerical simulation
1 Introduction 1.1 Geological and Engineering Conditions of the Target Engineering In Shajihai underground coalmine, a passage was preexcavated in the longwall panel along the terminal line to facilitate heavy equipment recovery at the end of mining stage. Shajihai coalmine is a fully mechanized underground coalmine located in Xinjiang Province, China. Its primary mineable coal seam is No. B10 coal seam, which has an average thickness of 7.0 m and average incline of 13°. The immediate roof is compound mudstone with a whole thickness of 18 m and
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the main roof is sandstone with an average thickness of 12 m. The immediate floor is mudstone with an average thickness of 8 m and the main floor is sandstone with an average thickness of 8 m (Fig. 1a). The designed longwall panel is 1500 m long and 150 wide. Top coal caving mining was employed in this longwall panel to extra
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