Research on stress release for the gob-side roadway using the roof-cutting technology with a chainsaw arm

Tai, Yang; Yu, Bin; Xia, Binwei; Zhao, Li; Xia, Hongchu

doi:10.1098/rsos.191663

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…15,16 The reason why this technology is replaced by NPRP is completely due to the low recovery rate, which is not conducive to the sustainable development of the mine and coal industry. 17,18 2.1.2 | GSER layout mode NPRP includes GSER and EDGS. Among which, only GSER could be strictly called NPRP strictly, because there is no coal pillar between the adjacent working face.…”

Section: Dre Layout Modementioning

confidence: 99%

Study on the new layout pattern about the gob‐side entry under dynamic pressure and its surrounding rock stability control

Wang,

et al. 2024

Energy Science & Engineering

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Though the recovery rate of coal resources can be effectively improved by adopting the gob‐side entry longwall face, which is also easy to cause tension between mining and excavation. Therefore, a new type of roadway layout, narrow coal pillar entry retained (NCPER), was invented in the study. The NCPER is excavated together with the tailgate of next longwall face before the mining of prior longwall face, which is retained and reused during the mining of the next longwall face. The layout is based on the advantages and successful experience of the double roadways excavation, the gob‐side entry retained, and the roadway driven along gob‐side and heading for adjacent advancing coal face; moreover, the NCPER significantly shortens the preparation time of the longwall face while improving the recovery rate. Taking the production geological conditions of Yushuling Mine as the engineering background, the influence of factors such as roof‐cutting pressure relief and coal pillar width on the stability of the narrow coal pillar from the perspective of improving the stress environment of the roadway and strengthening the weak structure support of the surrounding rock was studied, and reasonable suggestions for selecting parameters of roof cutting and coal pillar width were given. Furthermore, the bidirectional grouting cable and its joist were used to strengthen the narrow coal pillar and the roadway roof, respectively, and a good effect of roadway control has been obtained. The invention and application of NCPER provided a new approach for the longwall face roadway layout and effectively eased the strained relationship between mining and excavating, which has a strong popularization and application value.

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Section: Dre Layout Modementioning

confidence: 99%

Study on the new layout pattern about the gob‐side entry under dynamic pressure and its surrounding rock stability control

Wang,

et al. 2024

Energy Science & Engineering

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“…For the second numerical model, a constraint was imposed on the bottom for restricting vertical displacement, 30 and linear loads were applied on two sides. The fault was described by a “Structure Interface.” 31 The models were meshed into many triangular elements. For the first model, 29,851 elements and 16,937 nodes were generated.…”

Section: Numerical Model For Precontrolling Rock Burst Via Ground Fra...mentioning

confidence: 99%

An innovative technology of fracturing hard strata from the ground for precontrol of rock burst in a coal mine

Tai

Kuang

et al. 2022

Energy Science & Engineering

Self Cite

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Rock bursts are one of the most common dynamic disasters in coal mines and seriously affect safety production. At present, there are three common types of rock bursts: fault‐structure, fold‐structure, and thick/hard‐roof rock bursts. First, the paper proposed an innovative technology for mine ground fracturing to control those rock bursts. Then, for the new method, its fracturing devices, process, and monitoring technique for cracks were introduced. Next, we analyzed the detailed control procedures for those types of rock bursts and control principles of absorbing energy, blocking stress transmission, and reducing overall rock strength. To illustrate the control effect of ground fracturing for the rock bursts, we proposed a Voronoi block division method (VBDM) and multistrength criteria (MSC) consisting of Mohr–Coulomb Joint, Hoek–Brown Joint, and strain–stress equivalent method. Then, two numerical models using the VBDM and MSC were established. One is fault‐structure rock burst with ground fracturing and another is that without. From the numerical simulation, it was concluded that: (1) The ground fracturing will increase τ/σn, a ratio of shear stress to the normal stress of the fault, from 0.25 to 0.50, especially within 100 m of a working face to a fault. This situation indicates that ground fracturing will induce fault slip in advance, thus releasing energy in advance. (2) Fractured zones with low stress were formed by ground fracturing, which can reduce both upward extrusion pressure and normal stress, thereby triggering the fault slippage in advance. The energy released from the fault can be absorbed by the fractured zone, thereby controlling the advanced stress of the working face, and lowering the danger of rock burst.

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“…Zheng [11] developed a mechanical model of gob-side roadway overburdens to analyze the large deformation and stress field distribution. In order to mitigate the problem of the coal pillar extrusion and serious deformation that will occur in the gob-side roadway, Tai [12] developed the roof-cutting technology with a chainsaw arm and its equipment. Zhang [13] investigated the effects of dynamic loading to gob-side entries and optimized the support parameters; the field test results showed that the potential for loosening, deformation, and failure of the surrounding rock were effectively controlled.…”

Section: Introductionmentioning

confidence: 99%

Stability Control of Deep Coal Roadway under the Pressure Relief Effect of Adjacent Roadway with Large Deformation: A Case Study

Yang¹,

Zhang

Sun³

et al. 2021

Sustainability

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High-efficiency maintenance and control of the deep coal roadway surrounding rock stability is a reliable guarantee for sustainable development of a coal mine. However, it is difficult to control the stability of a roadway that locates near a roadway with large deformation. With return air roadway 21201 (RAR 21201) in Hulusu coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to study pressure relief effect on the surrounding rock after the severe deformation of the roadway. Besides, the feasibility of excavating a new roadway near this damaged one by means of pressure relief effect is also discussed. Results showed that after the strong mining roadway suffered huge loose deformation, the space inside shrank so violently that surrounding rock released high stress to a large extent, which formed certain pressure relief effect on the rock. Through excavating a new roadway near this deformed one, the new roadway could obtain a relative low stress environment with the help of the pressure relief effect, which is beneficial for maintenance and control of itself. Equal row spacing double-bearing ring support technology is proposed and carried out. Engineering practice indicates that the new excavated roadway escaped from possible separation fracture in the roof anchoring range, and the surrounding rock deformation of the new roadway is well controlled, which verifies the pressure relief effect mentioned. This paper provides a reference for scientific mining under the condition of deep buried and high stress mining in western China.

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Research on stress release for the gob-side roadway using the roof-cutting technology with a chainsaw arm

Cited by 14 publications

References 27 publications

Study on the new layout pattern about the gob‐side entry under dynamic pressure and its surrounding rock stability control

Study on the new layout pattern about the gob‐side entry under dynamic pressure and its surrounding rock stability control

An innovative technology of fracturing hard strata from the ground for precontrol of rock burst in a coal mine

Stability Control of Deep Coal Roadway under the Pressure Relief Effect of Adjacent Roadway with Large Deformation: A Case Study

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