Stability analysis of open-pit gold mine slopes and optimization of mining scheme in Inner Mongolia, China

Ren, Shu-lin; Tao, Zhigang; He, Manchao; Pang, Shuiquan; Li, Mengnan; Xu, Haiying

doi:10.1007/s11629-020-6217-x

Cited by 20 publications

(9 citation statements)

References 35 publications

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“…On the other hand, the bulging phenomenon of the floor below the field is also moving forward dynamically. us, this phenomenon is consistent with the test results of similar materials [31][32][33].…”

Section: Law Of Rock Mass Movement Deformation Andsupporting

confidence: 91%

Research on the Evolution Characteristics of Rock Mass Response from Open‐Pit to Underground Mining

Geng

et al. 2021

Advances in Materials Science and Engineering

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This study is based on the engineering background of pit no. 2 in Jinning Phosphate Mine, China. In order to systematically analyze the movement, deformation, and failure laws of surrounding rocks in underground stopes. The room and pillar method is used to excavate and stop the ore bodies in the mining area. Combined with the similar physical model experiments and discrete element MatDEM numerical simulations, it reveals the deformation and failure laws and evolution characteristics of the surrounding rock of the stope in the process of converting from open-pit to underground mining. The results show the following: (1) Along the inclination of the ore body, the farther the horizontal and vertical displacements are from the underground stope, the less the impact of mining stress. On the other hand, along the inclined vertical direction of the ore body, the farther the measuring point is from the stope, the smaller the range of mining influence will be. (2) In the process of ore body recovery, the rupture of the overlying strata of the stope has an obvious layered structure, with collapse zones, fissure penetrating zones, and microfracture loosen zones appearing from the bottom to top. In addition, the movement and destruction of the overlying strata of the entire stope is an “elliptical arch.” Therefore, the results of similar simulation experiments and numerical simulation are basically consistent.

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Section: Law Of Rock Mass Movement Deformation Andsupporting

confidence: 91%

Research on the Evolution Characteristics of Rock Mass Response from Open‐Pit to Underground Mining

Geng

et al. 2021

Advances in Materials Science and Engineering

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“…The geological structure of the Changshanhao open-pit mine in Urad Middle Banner, Inner Mongolia, China is extremely complicated, and various slope instabilities have occurred, such as wedge sliding, bedding sliding, and toppling failure. Slope failure occurs to endogenic and exogenic integration, including physical and mechanical properties of the rock mass, geological structures such as faults and joints, and anthropogenic factors such as blasting and excavation disturbances [ 16 ]. In underground mining activities, rainfall and the dip of excavated rock slope also has a potentially important impact on the initiation and reactivation of slope deformation, especially on the steep rock slope [ 17 – 19 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of stability law and optimization of slope angle during excavation of deep concave mine slope

He²,

Guo³

et al. 2022

PLoS ONE

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Occasional collapse failure is a typical occurrence during mine slope excavation processes. This study aimed to investigate the disaster law in the process of mining slope excavation, and further explore the optimal selection of excavation angle. Based on the systematic analysis of the residual sliding force and deformation response characteristics during slope excavation, the increment of the residual sliding force increases and the stability coefficient decreases with the increase in excavation depth. Additionally, a numerical model of the Jinchuan mining area in Jinchuan City, Gansu Province, China was created using the Midas-GTS finite element software. The influence of different excavation slope angles on slope stability was analyzed via numerical simulation under certain step slope height and width. The results show that the force and deformation of the slope were unfavorable to slope stability, and the slope stability coefficient would decrease gradually with the increase in slope angle. In addition, the optimal excavation angle combination ranges were determined as 62°~ 65°, 64°~ 67°, 67°~ 69°, 70°~ 71°, 73°, 75°~ 76°, 77°~ 80°considering the stability and maximum recovery. Therefore, the above research results verify the loading effect of mine slope excavation, and can serve as a reference for studies on the optimal range of excavation angles for the mine slope.

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“…Janbu and Bishop methods are those with upper and lower probabilities of failure, respectively, in two conditions with and without considering the cross-correlation between cohesion intercept ( c ) and angle of shearing resistance ( φ ) [ 10 ]. Numerical models for the present mining area and final mining area of the original scheme were established to analyse slope stability by the limiting equilibrium method [ 11 ]. The advent of computers allowed the use of the finite element method to produce results such as safety factors and deformation curves for slopes.…”

Section: Introductionmentioning

confidence: 99%

Hazard Classification and Stability Analysis of High and Steep Slopes from Underground to Open-Pit Mining

Zhao²,

Hu³

et al. 2022

IJERPH

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The stability of high and steep slopes in open-pit mines is closely related to the mine operations and the lives of the surrounding residents, so it is important to ensure the safety and stability of the slopes. Hazard classification and stability analysis of high and steep slopes under different working conditions are studied using the Shizhuyuan non-ferrous metal mine from underground to open-pit mining as a typical example. Firstly, data on rock mechanics parameters were obtained through site investigation and sampling. Then, the slope model of the open-pit mine was established and some slopes were selected in the model for qualitative and quantitative analysis. The strength reduction method and the limit equilibrium method were used to calculate the safety factor under each working condition and point out the potential instability areas. The results show that the selected slopes are safe and stable under all working conditions. Finally, on the premise of maintaining the safety and stability of the mine, the final slope angle was optimized from the original 45°21′35″ to 55°30′41″ to reduce production costs and increase mining efficiency. The final open-pit boundary that meets the stability requirements was eventually obtained.

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Stability analysis of open-pit gold mine slopes and optimization of mining scheme in Inner Mongolia, China

Cited by 20 publications

References 35 publications

Research on the Evolution Characteristics of Rock Mass Response from Open‐Pit to Underground Mining

Research on the Evolution Characteristics of Rock Mass Response from Open‐Pit to Underground Mining

Analysis of stability law and optimization of slope angle during excavation of deep concave mine slope

Hazard Classification and Stability Analysis of High and Steep Slopes from Underground to Open-Pit Mining

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