Strata movement law based on progressive caving of the hanging wall: a case of study in Chaganaobao Iron-Zinc Mine
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ORIGINAL PAPER
Strata movement law based on progressive caving of the hanging wall: a case of study in Chaganaobao Iron-Zinc Mine Feifei Wang 1,2,3 & Qingyang Ren 1 & Bin Chen 1 & Ping Zou 2,3 & Zijian Peng 1 & Wanjie Hu 2,3 & Zeng Ma 2,3 Received: 18 February 2020 / Accepted: 6 October 2020 # Saudi Society for Geosciences 2020
Abstract In this study, the calculation process of the progressive caving of the hanging wall is introduced in detail. The progressive caving of the hanging wall in the subsidence area is studied by using theoretical calculation and numerical simulation. Excel software is used to compile the calculation program of the progressive caving of the hanging wall. The results show that the mining depth of the underground orebody has a significant effect on the crack depth, angle of the failure surface, and caving angle of the rock mass. There is a positive correlation between the mining depth and the angle of the failure surface. There is a negative correlation between the mining depth and the crack depth and caving angle. The crack depth is 39.00~39.23 m. The angle of the failure surface is 52.83~54.08°. The caving angle is 57.35~67.78°. The maximum cracking range of the hanging wall is 448.5 m. The maximum cracking range in the strike direction is 92.4 m. The predicted range of numerical simulation is close to that of theoretical calculation. The reliability of the theoretical calculation is verified. The research results can provide a reference for mine safety production. Keywords Mining engineering; . Theoretical calculation; . Numerical simulation; . Strata movement; . Progressive caving of the hanging wall
Introduction Surface subsidence caused by underground mining is a global problem, which will cause damage to land, buildings, and structures (Chen et al. 2016; Sasaoka et al. 2015; Ju and Xu 2015). Surface collapse affects the safety of the production and life and property. In recent years, many cases show that the collapse has caused the loss of the life and property (Villegas et al. 2011; Fazio et al. 2017; Guarino et al. 2018; Santolo et al. 2018).
In order to protect buildings and reduce the damage degree of buildings and structures under their anti-deformation ability, it is necessary to accurately predict the surface movement and deformation (Wang et al. 2016; Jing et al. 2018; Li et al. 2019). When the orebody is not very large and the dip angle is relatively steep, the caving of the hanging wall surrounding rock needs to be considered. In this case, with the gradual development of the underground mining (such as the use of sublevel caving method), the mining depth will gradually
Responsible Editor: Zeynal Abiddin Erguler * Qingyang Ren [email protected]
Wanjie Hu [email protected] Zeng Ma [email protected]
Feifei Wang [email protected] Bin Chen [email protected]
1
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Ping Zou [email protected]
2
Changsha Institute of Mining Research Co., Ltd, Changsha 410012, Hunan, China
Zijian Peng 736500696@
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