An innovative strata movement model for predicting overlying strata deformations
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ORIGINAL PAPER
An innovative strata movement model for predicting overlying strata deformations Cheng Wang . Siyuan Li
Received: 9 March 2020 / Accepted: 26 May 2020 Springer Nature Switzerland AG 2020
Abstract The overlying strata in mining could move, deform and break with the advancement of the underground mining operations and form the ‘‘three-vertical-zones’’ over the mined-out areas. In this paper, the influence function method based to predict the surface subsidence is innovatively introduced to establish the movement model of subsurface strata over underground mine gob. In order to validate the developed model’s reliability, the model is applied in a Chinese underground mine to calculate the subsurface strata movements. Then a physical simulation modelling is also conducted to study the behavior of rock strata affected by mining. By using cross-validation, the theoretical results are compared with the physical simulations, which indicates that those two results are highly agreed with each other. The reliability of developed model can be a good tool to study the progress of subsurface stratum bedding and caving in a coal mine. Keywords Overlying strata Influence function method Strata movement Physical simulation
C. Wang (&) School of Environmental Science and Engineering, Hubei Polytechnic University, Huangshi 435003, China e-mail: [email protected] S. Li ZhuAn Safety Technology Company Limited, Xuzhou 221116, Jiangsu, China
1 Introduction Prior to the exploitation of underground coal resources, the underground strata are in a relatively static state and maintain an internal stress balance. To develop a coal mine, a series of mine shafts, roadways, chambers etc. must be excavated firstly. Therefore, the original stress balance state of strata could be damaged, and the internal stress of the rock mass could be redistributed until a new equilibrium is reached. The process for the internal stress of strata to reach a new equilibrium is also a process for the surrounding strata as well as the ground surface to form movements and deformations (Ning et al. 2019; He et al. 2018; He and Xu 2018; Vallejos and McKinnon 2011). Studies on the transfer of mining influence in the rock mass can be roughly divided into two types: studies on the movement and strata breaking around the coal seam (immediate roof and floor), and studies on the movement and deformation from the upper roof to the top of the impact layer (Zhou et al. 2017; He et al. 2018; Vallejos et al. 2011; Wu et al. 2015; Ouyang et al. 2016). There are currently various hypotheses and theories regarding the characteristics of strata movement, such as the pressure arch hypothesis, the cantilever beam hypothesis, the glued rock block hypothesis, the ‘‘masonry beam’’ theory and the transferring rock beam hypothesis, et al. Among those theories, the ‘‘masonry beam’’ theory (Guo et al. 2016; James et al. 2008; Chen et al. 2016) proposed by Qian (1996) is the most successful one. In this paper, an
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