Numerical Simulation of Slope Stability in the First Mining of Open-Pit Coal Mine

This paper analysis open-pit coal mine slope stability in the first mining with FLAC3D, reveal the mechanism of slope deformation, through analysis the stress and strain nephogram of model ZK8 of the first mining slope, and calculation safety stability coefficient, finally concluding stope slope of the first mining occur slip as circular form under their own gravity. The safety factor of model ZK8 is more than stope slope safety coefficient 1.20, slope is in steady state, obtained the accurate and reliable analysis results of stability.

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Stability and Deformation Analysis for Excavation and Backfilling of Fushun West Open-Pit Coal Mine

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.751 ◽

2013 ◽

Vol 353-356 ◽

pp. 751-755 ◽

Cited By ~ 1

Author(s):

Yong Cheng Yan ◽

Xian Zhang Ling ◽

Feng Zhang ◽

Jia Hui Wang

Keyword(s):

Coal Mine ◽

Slip Surface ◽

Surrounding Rock ◽

Open Pit ◽

Deformation Analysis ◽

Interface Model ◽

Safety Coefficient ◽

Mine Slope ◽

The Stability ◽

Technical Basis

Taking section W400 of Fushun west open-pit coal mine for the research, the interface model of fracture zone and surrounding rock was established. FLAC3D is used to analysis the influence of excavation and backfill of open-fit coal mine to the slope stability and deformation. The numerical results and analysis show that: (1) when the open-pit coal mine slope is excavated to final production line, the safety coefficient is 2.98, with the excavation, the deformation of the Fushun No.1 Refinery Factory area increases. (2) With the increase of backfilling, the slope coefficient increases to 3.32, this will reduce the deformation of the Fushun No.1 Refinery Factory area. Furthermore, the positions of the dangerous slip surface and serious deformation part of factory area should be regards as key areas. These conclusions could provide technical basis for the stability analysis of Fushun west open-pit coal mine.

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Analysis of the Open-Pit to Underground Mining Slope Stability

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.484-485.599 ◽

2014 ◽

Vol 484-485 ◽

pp. 599-603

Author(s):

Guang Ming Bao ◽

Juan Chang ◽

Zhi Gang Liu

Keyword(s):

Numerical Simulation ◽

Slope Stability ◽

Underground Mining ◽

Open Pit ◽

Maximum Displacement ◽

Modeling Software ◽

Stability Of Slope ◽

Computer Numerical Simulation ◽

The Stability ◽

Mining Slope

This paper uses the simulation technology of computer numerical simulation, combined with the GAMBIT numerical modeling software and ANSYS structure analysis software, we carry out an in-depth research and analysis on the stability of engineering simulation, at the same times establish the mathematical model of ANSYS numerical simulation displacement stability and design the ANSYS command stream program algorithm. Finally, this paper uses the open-pit to underground mining slope stability as an example, to verify the reliability of the model and algorithm. Through the numerical simulation, we get the displacement of slope in the Y direction and Z direction. In the Y direction, the maximum displacement is 0m, the negative maximum displacement is 5.88m and displacement is relatively large; in the Z direction, the maximum displacement is 1.32M, the negative maximum displacement is 1.08M and the stability of slope is different in different position. The numerical simulation provides the theory reference for the safety of mining engineering.

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Effect of Coalbed Methane Well Fracturing on Slope Stability of Open-Pit Coal Mine: A Case Study of Shengli East No. 2 Open-Pit Coal Mine

Advances in Civil Engineering ◽

10.1155/2020/4708274 ◽

2020 ◽

Vol 2020 ◽

pp. 1-16

Author(s):

Qingzhong Zhu ◽

Bo Wang ◽

Xin Zhao ◽

Chunchun Liu ◽

Qing Yu ◽

...

Keyword(s):

Numerical Simulation ◽

Slope Stability ◽

Coal Mining ◽

Dynamic Fracture ◽

Coal Mine ◽

Coalbed Methane ◽

Limit Equilibrium ◽

Open Pit ◽

Fracture Width ◽

Fracture Height

The impact of hydraulic fracture from CBM well fracturing on slope stability of the Shengli East No. 2 open-pit coal mine is analyzed by numerical simulation and limit equilibrium methods. The interference effect of coalbed methane (CBM) well fracturing on slope stability of the open-pit coal mine promotes the coordinated development of CBM, and open-pit coal is discussed before and after coal mining. It shows that nearly horizontal fractures are formed in the coal seam due to CBM well fracturing, of which the dynamic facture length and propping fracture length are 137.2 m and 105.2 m, respectively. Moreover, the dynamic fracture height is 137.2 m and propping fracture height is 130.6 m. At the location of perforation, the dynamic fracture width is 0.873 cm and average propping fracture width is 0.111 cm. The CBM well fracturing barely imposed any effect on slope stability before open-pit coal mining. The maximum vertical displacement at the toe of slope induced by fracturing is 0.293 mm. In situations with and without CBM well fracturing, vertical stress distributions in the toe, top, and interior of slope have no obvious difference. There is some extent of vertical stress increase within the interior of slope, which is merely 0.2 MPa higher than that in the condition of initial in situ stress equilibrium. The presence of hydraulic fractures has little effect on the overall displacement of slope during coal mining; and there is no obvious difference between the slope stability during coal mining and the slope stability impacted by fracturing. According to the results of limit equilibrium method and numerical simulation, the overall slope stability coefficient is 1.5–1.97, which accords with the requirements of the Design Code for Open-Pit Mine of Coal Industry (GB50197-2015). Therefore, more attentions should be paid to the ways of excavation and sloping during coal mining, avoiding slope instability caused by excavation.

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