Investigating the destressing mechanism of roof deep-hole blasting for mitigating rock bursts in underground coal mines

Kan, Jiliang; Li, Dou; Li, Xuwei; Li, Jiazhuo; Chai, Yanjiang

doi:10.1080/19475705.2022.2122594

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…According to the strength weakening and blanking reduction theory, reducing the accumulated energy in coal and rock mass is an effective method to eliminate the occurrence of rock bursts [27]. When the coal and rock mass are under the triple stress status, there is lots of elastic energy in the HPWJ cutting after unloading.…”

Section: Effect Of the Hpwj Slotting On Coal Seam Stress Reduction An...mentioning

confidence: 99%

Optimization of Destressing Parameters of Water Jet Slits in Rock Burst Coal Seams for Deep Mining

et al. 2023

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Mining in deep coal seams is characterized by high ground stress, often accompanied by coal and rock dynamic disasters such as rock bursts. High-pressure water jet slotting technology can relieve pressure and reduce the stress concentration on the coal seam, which is one of the effective pressure relief measures in rock burst coal seams for deep mining. Reasonable pressure relief parameters are an important influence on the effectiveness of pressure relief achieved by a high-pressure water jet. This paper uses theoretical analysis and numerical simulation to analyze the principle of high-pressure water jet pressure relief and rock burst prevention, and a theoretical calculation model of six key pressure relief parameters is constructed. The optimal values of each pressure relief parameter are obtained, and good pressure relief effect is achieved in a certain rock burst risk area. The research results showed that (1) parameters such as drilling spacing–slit radius, drilling depth–slit length, and slotting cutting spacing–slotting cutting width have a great influence on the pressure relief effect, and there is a significant interaction between the parameters, while the strength of the coal seam also has a significant effect on the selection of the parameters and the pressure relief effect. (2) The displacement, vertical stress, plastic zone, elastic energy, impact risk index, and the cost of pressure relief can be used to comprehensively evaluate the quality and economy of the pressure relief effect, and the optimal pressure relief parameters of high-pressure water jet slotting under specific physical force properties of the coal seam can be obtained. (3) High-pressure water jet technology with optimal pressure relief parameters was applied to No. 3 connecting the roadway in the 730 mining area of a mine studied, and field monitoring showed that indicators such as microseismic frequency, total energy, and spatial concentration significantly decreased. Moreover, the accuracy of the theoretical model of high-pressure water jet slotting pressure relief parameter optimization is reliable in the relevant technical parameters of coal seam slotting. It is believed that the model can be used to design the high-pressure water jet slotting pressure relief parameters in deep rock burst coal seams.

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Section: Effect Of the Hpwj Slotting On Coal Seam Stress Reduction An...mentioning

confidence: 99%

Optimization of Destressing Parameters of Water Jet Slits in Rock Burst Coal Seams for Deep Mining

et al. 2023

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“…Therefore, the control of hard-roof plate weighting has been extensively investigated, leading to the development of many practical solution technologies. For instance, deep hole blasting can be used to reduce the weighting step (Wang et al, 2013;Chen et al, 2022;Kan et al, 2022) or hydraulic fracturing of the roof (Moghadasi et al, 2019;Zheng et al, 2021;Liu, 2022). Similarly, slotting in the middle of the roof can prevent the roof from falling suddenly while supporting cutting, and mined-out areas or areas with a detached roof can be filled to eliminate the dynamic pressure impact caused by roof collapses (Chang et al, 2021;Sun et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Principle and practice of hydraulic softening top-cutting and pressure relief technology in weakly cemented strata

Wang,

Xu,

Liu

et al. 2024

Front. Earth Sci.

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Extremely thick and hard roofs are difficult to break in the mining of a working face, and the large area of the suspended roof easily induces a strong ground pressure or dynamic impact disasters. The roof control of a coal mining face in a mine in western China was taken as a case study. The mineral composition, microstructure, and hydrophysical properties of the hard roof overlying the coal seam were analyzed. The characteristics of the weak-cementation strata that are prone to mud and collapse when encountering water were targeted to investigate the hydraulic softening roof-cutting and pressure relief technology. It was found that the clay mineral composition in the roof plate accounts for 60.6%. After 24 h of natural immersion, the rock strength decreased by approximately 10.3%–49%, and further immersion caused disintegration. By arranging high and low double-row water injection softening drilling holes in the cutting hole and roadway of the working face, the strength of roof rock strata in the target area was reduced, and the initial weighting step distance and weighting strength of the working face were reduced. The hydraulic softening roof-cutting pressure relief technology effectively regulated the weighting step distance of the hard roof and the peak weighting of the working face.

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“…As a result, the encounter between the driving roadway and the working face is likely to happen, and the mining roadway is seriously affected by the mining of the adjacent working face [1,2]. The existing research has proven that cutting off the roof between the mining face and the roadway is an effective way to solve the issues of large deformation and serious damage to the facing-mining roadway [3,4]. Currently, the commonly used roof cutting methods are blasting and hydraulic fracturing.…”

Section: Introductionmentioning

confidence: 99%

Study on the Surrounding Rock Deformation Laws of Facing-Mining Roadway and the Reasonable Space–Time Relationship of Hydraulic Fracturing

Liu

Bian

et al. 2023

Processes

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The mining confrontation caused by a super-long working face is an important factor that leads to difficulties in the control of surrounding rock in facing-mining roadways. To address this issue, this study takes the 18106 working face of Xiegou Coal Mine as the engineering background. First, deformation characteristics of the surrounding rock in two stages of roadway mining are explored, and the principle of determining the time for fracturing construction is presented. Additionally, the influence of fracturing space position on the control effect of the roadway’s surrounding rock is examined. Results show that the roadway which is influenced by adjacent working face mining has obvious asymmetric deformation, and the order of deformation is as follows: pillar side > roof > coal side > floor. The roof activity in goaf is the key factor of roadway deformation, and the proportion of deformation is 60%, followed by the influence of advance stress, accounting for 38%. After fracturing, with the increase in fracturing height, the deformation of the surrounding rock decreases, and the decrease in deformation of the roof and two sides also reduces, while the decrease in deformation of the floor remains relatively stable. The reasonable fracturing height is 10 m, and the reasonable fracturing construction time is 17 days before the confrontation between the working face and the roadway. Field practice suggests that there are effective cracks in the roof after fracturing, and the deformation of the surrounding rock in facing-mining roadways is reduced by more than 60% compared to that without fracturing. Hydraulic fracturing is significant for controlling the deformation of the surrounding rock in facing-mining roadways.

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Investigating the destressing mechanism of roof deep-hole blasting for mitigating rock bursts in underground coal mines

Cited by 10 publications

References 28 publications

Optimization of Destressing Parameters of Water Jet Slits in Rock Burst Coal Seams for Deep Mining

Optimization of Destressing Parameters of Water Jet Slits in Rock Burst Coal Seams for Deep Mining

Principle and practice of hydraulic softening top-cutting and pressure relief technology in weakly cemented strata

Study on the Surrounding Rock Deformation Laws of Facing-Mining Roadway and the Reasonable Space–Time Relationship of Hydraulic Fracturing

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