Numerical simulation study on the evolution law of mine pressure in deep mining
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ORIGINAL PAPER
Numerical simulation study on the evolution law of mine pressure in deep mining Chen Qiao 1,2 & Chang-hong Li 1,2 & Xiao-ming Wei 3 & Yong-yue Hu 1,2 Received: 7 August 2019 / Accepted: 18 May 2020 / Published online: 13 June 2020 # Saudi Society for Geosciences 2020
Abstract The evolution law of surrounding rock pressure in deep mining is explored in this paper by analyzing the stress, displacement, and failure progress of surrounding rock in the deep mining of Beiminghe Iron Mine by in situ monitoring and FLAC3D numerical simulation. The evolution characteristics of surrounding rock deformation of different layer roadways during the entire excavation and mining process are observed, with results showing that movable support pressure exists in the excavation and mining process of the roadways. In the process of roadway excavation, vertical stress increases at the pillars, while horizontal stress increases at the roof and floor of the roadway. When the roadways are mined, the stress relaxed area is 0–4 m from the mining face, the stress increase area is 4–60 m from the mining face, and the original rock stress area is 60 m from the mining face. During the mining period, the horizontal convergence displacement of two sides of the roadway is lateral expansion caused by vertical stress, while vertical deformation of the roof and floor of the roadway is predominately caused by horizontal stress extrusion. The mining of upper layer roadways has a certain influence on lower layer roadways, and the mining of the same layer roadways only has a significant impact on adjacent roadways. With the increase of mining depth, the stress concentration becomes more obvious, and the convergence of vertical displacement and horizontal displacement of rock strata increases. In addition, shear failure occurs in overburden strata and shear tension failure occurs in the floor of the roadway. Keywords Deep mine pressure . Evolution law . In situ monitoring . Numerical simulation
Introduction Deep mining is an inevitable development of a mining industry faced with declining shallow mineral resources (Chen et al. 2013; Deng et al. 2019; Li 2010; Lobanova and Moiseev 2009). The process of deep mining creates a complicated mechanical environment in the surrounding rock (Li et al. 2019; Nghia and Jonsson 2013; Qi et al. 2017). Under the action of mining disturbance, the original stress state of the surrounding Responsible Editor: Murat Karakus * Chang-hong Li [email protected] 1
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing, China
3
BGRIMM Technology Group, Beijing, China
rock is destroyed, causing the redistribution of stress in rock mass, which leads to deformation and destruction of the surrounding rock (Kim et al. 2019; Shreedharan and Kulatilake 2016; Shen et al. 2013). In most situations, the de
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