Stability Analyses and Cable Bolt Support Design for A Deep Large-Span Stope at the Hongtoushan Mine, China

Zhao, Xingdong; Li, Huaibin; Zhang, Shujing; Yang, Xiaoming

doi:10.3390/su11216134

Cited by 11 publications

(8 citation statements)

References 39 publications

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“…Analysis of the stability of mining excavation by numerical modeling is commonly used in the mining industry [24], [42]- [45]. In this analysis, we used the RS2 software developed by RocScience Inc. [46] to analyze the displacements and the safety factor (SF) around the excavation generated by the overhand cut and wire operating method chosen as the extraction method optimal for exploiting shallow-dip vein deposits hosted in poor quality rocks.…”

Section: Methodsmentioning

confidence: 99%

Study and evaluation of the stability of underground mining method used in shallow-dip vein deposits hosted in poor quality rock

Ghazdali¹,

Moustadraf²,

Tagma³

et al. 2021

Min. miner. depos.

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Purpose.This article proposes to analyze and determine the mining design for shallow-dip deposits hosted in poor quality rock. Methods. We used the UBC tool to find the optimal exploitation method, the Rock mass rating (RMR) and Q-system (Q) to determine the optimal mining stope and the recommended rock support, the numerical modeling by RS2 software with a variety of geotechnical, geometrical, and technical conditions to analyze the evolution of the unstable zone width and the maximum total displacement around the stope after excavation. Findings. The optimum mining method designated by the UBC tool for this type of deposit is the cut and fill. By projecting the obtained RMR and Q-system values on the design graph, it is concluded that the operating stope is located in the stable zone with a height of 3 m, and bolting support is recommended. The simulation by RS2 software reveals that the optimal mining design that can be used to mine shallow-dip vein deposits hosted in poor quality rocks consists of a 3 m high stope and a 75° dip with cemented backfill. Originality.This work presents a study to choose the most suitable underground mining method and mine design for shallow-dip deposits hosted in poor quality rock. Practical implications.In the mining industry, the success of operating an underground mine is conditioned by the selection of the appropriate method, of the mining design and dimensioning of a rock support adapted to the nature of the rock, and excavation geometry according to the type and nature of the deposit.

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Section: Methodsmentioning

confidence: 99%

Study and evaluation of the stability of underground mining method used in shallow-dip vein deposits hosted in poor quality rock

Ghazdali¹,

Moustadraf²,

Tagma³

et al. 2021

Min. miner. depos.

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show abstract

“…Moreover, it analyzes the sequences of mining methods according to the desired backfill. Currently, several research works use numerical modeling as a means of stability analysis in the mining industry context, such as [13]- [17]. Generally, the most used criteria for a geotechnical analysis evaluation are major principal stress, minor principal stress, and safety factor.…”

Section: Figure 2 Cross-section Represents the Cobalt Ore Vein With I...mentioning

confidence: 99%

Geotechnical modeling of the method for mining cobalt deposits at the Bou Azzer Mine, Morocco

Driouch¹,

Ouadif²,

Lahmili³

et al. 2023

Min. miner. depos.

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Purpose. The Bou Azzer Mine encounters difficulties during cobalt mining. In order to select the optimal mining sequence with the least geotechnical stability problems, one possible variant is the cut and backfill mining method used in the Bou Azzer East area at a depth of 540 m. Methods. This paper presents a methodology for selecting a sequence of the cut and backfill mining method using 2D geotechnical numerical modeling, taking into account the morphological characteristics, geomechanical properties of the ore and the surrounding rocks. Findings. The sequences of mining with rock backfill and rock-cemented backfill show that the high principal stress (Sigma 1) is in the range of 10-153 MPa, and the safety factors are in the range of 0.63-1.89. Therefore, mining sequences with cemented backfill and under cemented backfill have a principal stress (Sigma 1) in the range of 10-112 MPa and acceptable safety factors. Originality. In this study, the bottom-up mining sequence with a cemented backfill is proposed for the case of low-quality serpentine footwall. This mining sequence aims to achieve good cobalt mine production and provides a safe environment for miners. Practical implications. In the mining industry, the choice of mining method using 2D or 3D geotechnical numerical mo-deling is important to ensure the safest and most operational mining sequence in the mine lifetime.

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“…The regression equations of the maximum horizontal principal stress, minimum horizontal principal stress and vertical stress are obtained by hollow inclusion stress relief method in the field as follows (Zhao et al, 2019).…”

Section: Site Description Engineering Geologymentioning

confidence: 99%

Study on the evolution and prediction of fracture depth of surrounding rock in deep mining roadway based on numerical analysis and borehole detection

Zhao²,

Dai³

et al. 2022

Front. Earth Sci.

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The failure of surrounding rock in deep hard rock roadway is closely related to mining disturbance. In this study, the 13# stope ramp of −767 m level (at a buried depth of 1,197 m) at Hongtoushan copper mine was taken as the engineering background, a comprehensive analysis method of numerical analysis and borehole detection was put forward, and the evolution law of fracture depth of the ramp surrounding rock under the mining influence was obtained. The results show that the maximum tangential stress and fracture depth of the ramp surrounding rock on both sidewalls increase slowly at the initial mining stage. When the ore body above the ramp is mined, the maximum tangential stress and fracture depth of the ramp surrounding rock on both sidewalls increase rapidly, and the two parameters are positively correlated. Based on this, the ratio of the maximum tangential stress of the surrounding rock to the uniaxial compressive strength of intact rock (σθmax/σc) and the equivalent radius (a) of the roadway were used as parameters, and an equation for the fracture depth of the roadway surrounding rock was proposed. Through the case analysis, the results show that the proposed equation of fracture depth of the roadway surrounding rock has good prediction accuracy. This study enriches the research on the stability and failure mechanism of the roadway surrounding rock under the mining disturbance, and provides new basis for the support design of mining roadways.

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Stability Analyses and Cable Bolt Support Design for A Deep Large-Span Stope at the Hongtoushan Mine, China

Cited by 11 publications

References 39 publications

Study and evaluation of the stability of underground mining method used in shallow-dip vein deposits hosted in poor quality rock

Study and evaluation of the stability of underground mining method used in shallow-dip vein deposits hosted in poor quality rock

Geotechnical modeling of the method for mining cobalt deposits at the Bou Azzer Mine, Morocco

Study on the evolution and prediction of fracture depth of surrounding rock in deep mining roadway based on numerical analysis and borehole detection

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