Numerical study on movement of dynamic strata in combined open-pit and underground mining based on similar material simu
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ORIGINAL PAPER
Numerical study on movement of dynamic strata in combined open-pit and underground mining based on similar material simulation experiment Junwen Zhang 1,2 & Zhenwei Wang 3 & Zhixiang Song 1 Received: 27 May 2019 / Accepted: 29 July 2020 / Published online: 10 August 2020 # Saudi Society for Geosciences 2020
Abstract The characteristics of the movement of dynamic strata in combined open-pit and underground mining based on similar material simulation experiments were studied in this study. To get more accurate test parameters, a similar material, based on a sheet of brittle material, was developed. We then used the Anjialing coal mine as our case study sample. The characteristics for movement of dynamic strata and development of bed-separated fissure in working faces including 24,207, 24,208, and 29,210 were investigated by experimental simulation and numerical simulation, which was based on a similar simulation test system and Fast Lagrangian Analysis of Continua 3D (FLAC3D) statistical analysis software. Results from the experimental simulation demonstrated that the movement of dynamic strata during the mining process could be expressed as follows: underground mining → submerged rock → “arch-shaped” rock → “pit-type” subsidence region → perforation of slope fractures. When the working face 29,210 was advanced to the mining stop line, the overlying rock strata generally slid towards the slope with less separation cracking in the vertical direction. With the continuous advancement of working face 29,210 , the slope stress increased significantly and formed a slip surface or potential slip surface in the sloping rock. Moreover, the numerical analysis, similar material simulation experiment, and actual mining results were all similar, indicating that a similar material simulation experiment based on a sheet of brittle material well reflected the characteristics for the movement of dynamic strata in combined open-pit and underground mining. Keywords Similar materials . Sheet of brittle material . Characteristics of dynamic strata movement . Numerical calculations
Introduction In the traditional coal and rock mining industry, there are mainly two methods of open-pit mining and underground mining. As a new optimization challenge in mining engineering, the open-pit to underground joint mining has a better mining effect in practical applications. In recent years, joint Responsible Editor: Murat Karakus * Junwen Zhang [email protected] 1
School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2
State Key Laboratory of Coal Resources and Safe Mining (CUMT), Xuzhou, China
3
School of Civil Engineering, North China University of Technology, Beijing 100041, China
mining has become the primary mining method (Sun et al. 2000; Wang and Huang 1998; Lai et al. 2015; Huang et al. 2016). In actual engineering, the overburden deformation characteristics and slope stability are the main problems that restrict mining engineering. For conventional slope
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