Steep End-Slope Mining and Slope Stability of Extremely Thick Inclined Coal Seam Open-Pit Mine

Wang, Zhile; Tian, Ya; Zhou, Wei; Liu, Ziyu; Lü, Xiang; Kong, Ruiqian

doi:10.1155/2022/3807013

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…However, when the mining height of the equipment is increased, the prior experience of retaining twice the mining height is regarded to be conservative, and numerical simulation is recommended to determine it. Wang [36] suggested that the interlayer thickness should be greater than the height of the mining roof arch with a certain safety distance, generally above 3.0 m. Newman and Zipf [37] used a simple beam model to propose an equation for the thickness and tensile strength of the interlayer, which is calculated over 0.45 m for the entry width of 3.16 m.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Multi-Layer Highwall Mining: A Sustainable Approach for Thick-Seam Open-Pit Mines

Tian

Lü

et al. 2023

Sustainability

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Open-pit mining is a common method for extracting coal, but considerable resources are often left unrecovered at the bottom of end-slopes, leading to a permanent waste of resources. This research presents a sustainable approach of multi-layer highwall mining at different levels to address the issue of abundant resources left unrecovered at the bottom of the end-slope in thick-seam open-pit mines. The interlayer between the upper and lower entries is simplified into a beam structure model, the bending moment distribution characteristics of the beam under a load of highwall miner are analyzed, and a method for calculating the thickness range of the interlayer is proposed. The web pillar width and interlayer thickness, obtained theoretically, are verified through a numerical simulation, and the results of mining a single layer are compared to those of mining multiple layers. The results show that the web pillar width and interlayer thickness derived from the numerical simulation are basically the same as those of the theoretical analysis. Compared with single layer mining, the vertical stress on the web pillar in the lowest panel is reduced by 14.83~18.25%, and the safety factor of the web pillar is increased to 0.27. The web pillars and interlayers at different elevations are stable during multi-layer highwall mining. These findings support the feasibility of multi-layer highwall mining for resource recovery, which is conducive to sustainable mining.

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Section: Introductionmentioning

confidence: 99%

Stability Analysis of Multi-Layer Highwall Mining: A Sustainable Approach for Thick-Seam Open-Pit Mines

Tian

Lü

et al. 2023

Sustainability

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“…In terms of end slope mining : Wang et al analyzed the horizontal stress data of the slope and found that the horizontal stress follows a pattern of initially increasing and then decreasing during excavation and steep slope mining. [28] . Liu et al optimized the width of end slope mining road in open-pit mines, proposed an end slope mining scheme and carried out a simulation analysis method for slope stability [29] .…”

Section: Introductionmentioning

confidence: 99%

Research on Collaborative Optimization of End Side Mining under the “Dual Carbon” Goal—A Case Study of the Baorixile Open-pit Mine

LIU,

ZHANG,

BAI

et al. 2023

Preprint

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Under the “dual carbon” goal, various open-pit mines actively participate in the country's call, and use new technologies and methods to extract as much coal as possible After the coal is mined by the traditional method, so as to achieve the goal of efficient utilization of energy resources. The east end slope of Baorixile open-pit mine has reached the critical value of slope stability due to the previous longitudinal mining to the boundary, but the lower part of the end slope coal seam is still covered with coal seams. Therefore, the method of transverse mining and the inner discharge pressure side tracking is adopted for coal mining. In this paper, by clarifying the end slope landslide mechanism, the combination of AutoCAD and Rhino is used to establish a model, and the influence of the width of the end slope plate and the tracking distance of the inner discharge pressure side on the stability of the slope is analyzed by using FLAC3D, the width of the end slope plate and the tracking distance of the inner discharge pressure side have been determined with safety as the premise and production capacity as the goal. The research results show that the greater the width of the end slope plate, the better the slope stability; The greater the tracking distance of the inner discharge pressure side, but the smaller the production capacity. Therefore, considering factors such as safety and production capacity, it is determined that the width of the end slope plate is 40m, the tracking distance of the inner discharge pressure side is 200m, and the recoverable coal mining amount is 7.1403 million tons, stripping amount is 3.7962 million m3, making it the safest and the largest production capacity.

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“…According to the eld investigation and Google Earth images, Hu et al [11] analyzed the process of fracture propagation on the slope under underground mining and then investigated the failure mechanism of the slope by the numerical software RFPA3D. Taking the process of excavation of the open-pit mine as the background, Wang et al [12] analyzed the slope stability factor of the end slopes using the strength reduction method, which shows that the vertical stress and stability factor decreased with the process of excavation, while the horizontal stress initially increased and then decreased. Wang et al [13] proposed a displacement-statistics-based discrete element method and then investigated the stability of the jointed rocky slopes by incorporating the shear strength reduction method into the proposed modeling method.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Jointed Rock Cutting Slope Based on Discrete Element Method

Zhu

Gao

Zhao

et al. 2022

Advances in Civil Engineering

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The joints in the rock mass are essential for the stability of rocky slopes, and the destabilization damage of the slope is often directly related to the joints. In this study, in order to reveal the instability process and mechanism of rock slopes from a microscale perspective, the DEM simulations for rocky slopes of the K88 + 400∼K88 + 540 section of Zhongkai Expressway are carried out considering the influence of joints. Based on the findings of the on-site jointed structural surfaces, a rocky slope model containing two sets of intermittent joints was constructed, and the linear parallel bond model and the smooth joint model are used to characterize the rock body and joints, respectively. The evolution of microfracture, contact force chain, and particle displacement are analyzed to explore the micromechanism of slope instability. Finally, the triple reinforcement scheme of anchor cable frame and grass planting is proposed. The research results can provide a reference for stability analysis and reinforcement of similar rocky slope projects.

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Steep End-Slope Mining and Slope Stability of Extremely Thick Inclined Coal Seam Open-Pit Mine

Cited by 5 publications

References 22 publications

Stability Analysis of Multi-Layer Highwall Mining: A Sustainable Approach for Thick-Seam Open-Pit Mines

Stability Analysis of Multi-Layer Highwall Mining: A Sustainable Approach for Thick-Seam Open-Pit Mines

Research on Collaborative Optimization of End Side Mining under the “Dual Carbon” Goal—A Case Study of the Baorixile Open-pit Mine

Stability Analysis of Jointed Rock Cutting Slope Based on Discrete Element Method

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