Deformation Caused by Dynamic Load and Support Requirements in a Deep Gob-Side Entry Rock Mass

Zhang, Yandong; Yang, Yongjie; Zhuge, Changhua

doi:10.1155/2019/4530954

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…However, the cut roof pressure relief along the empty lane leads to the discontinuity of the roof of the roadway and the increase in the crushing degree of the two gangs, and the advanced support pressure of the working surface will further enhance the disturbance of the surrounding rock of the lane, restricting the overall maintenance effect and service life of the roadway, and the anchor cable strengthening support technology can enhance the stability of the roadway roof and the two gangs and weaken the influence of the lateral support pressure and the advanced support pressure on the roadway maintenance effect. Through theoretical analysis, it is concluded that the reinforcement of the roof plate, the reduction of the given deformation amount applied to the filler by the top slate layer, and the reduction of the load imposed by the overlying rock layer on the filler can effectively weaken the disturbance of the filling body to the bottom slate layer of the roadway and control the drum volume of the bottom drum of the roadway [28,29]. While reinforcing the roof, effective reinforcement measures for the physical coal gang can reduce the plastic area of the physical coal gang.…”

Section: Stress Characteristics Along the Empty Lane Aftermentioning

confidence: 99%

Study on the Deformation Mechanism of the Bottom Plate along the Empty Lane of Deep Mining and the Control Technology of the Bottom Drum

Pang

Niu

et al. 2022

Geofluids

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Aiming at the problem of the deformation of the roadway floor plate during the laneway during the retention period, the mechanical model of the roadway floor is established, and the deformation characteristics of the roadway floor and the change law of the bottom drum are studied and analyzed through theoretical calculation and calculus simulation, revealing the instability mechanism of the surrounding rock of the roadway under the stress disturbance environment, and when not affected by the adoption, the roadway forms a certain stress concentration area within the effective range of support. During mining, under the comprehensive action of the original peripheral stress field and the mining stress field, the cliffhanger is unstable under the comprehensive action of the original peripheral stress field and the mining stress field, and the extrusion and stretching effect of the unflapped part of the rock layer above the goaf section of the coal seam is set up along the air, resulting in violent deformation such as the bottom drum, and the rotational sinking of this part of the unflinted rock layer further aggravates the transfer of the overburden load to the surrounding rock of the lane, so that the surrounding rock along the empty lane is subjected to a large additional stress, and the mining stress field plays a leading role, and the mining stress “far field” is the compound stress field, of which the tensile stress is the leading destructive factor. The deformation of the surrounding rock is mainly based on the bottom, and the horizontal stress on the bottom plate along the empty lane is mainly generated by the horizontal strain that occurs after the lower rock layer of the filling body and the coal gang is subjected to the supporting pressure transmitted by the top plate. With the mining of the working surface, the roof of the goaf area is broken and collapsed to form the characteristics of “vertical three belts,” which is affected by the “large support” of the coal body of the working surface and the “small support” of the surrounding rock along the empty roadway, and the pressure relief of the cut roof can make the roof plate along the empty lane change from the “long arm beam” structure when the roof is not cut into the “short arm beam” structure, blocking the lateral stress of the goaf area to the roof plate of the alley and significantly reducing the degree of stress superposition of the roof plate of the alley. The technical means of blasting cutting roof active pressure relief and protective lane are used to block the transmission of lateral support pressure, the roof slate layer is precracked in advance, the sinking of the rock layer is accelerated, the disturbance time is reduced, the vertical stress of the rock layer and the rock layer above it along the empty roadway is reduced, the vertical stress concentration of the roadway is reduced, the stress concentration coefficient is reduced, the degree of damage of the surrounding rock after the top is weakened, the damage range is reduced, and the technical problem of large deformation prevention and control along the bottom drum of the empty alley can be solved. Constructing the mechanical structure model of the top plate of the cut top pressure relief and the uncut top pressure relief along the empty lane, the stress change characteristics of the active protective rock surrounding rock along the hollow top of the cut top pressure relief were calculated, and after the technical scheme of the blasting cut top active pressure relief and protection lane was adopted, the deformation along the empty roadway was significantly weakened, the stability of the surrounding rock of the roadway after the blasting of the cut roof was significantly improved, the maintenance state along the section of the empty roadway was good, and the cross-sectional convergence rate was reduced by 37.3% compared with the original section. Cutting the roof active pressure relief and protective lane can effectively improve the stability of the surrounding rock.

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Section: Stress Characteristics Along the Empty Lane Aftermentioning

confidence: 99%

Study on the Deformation Mechanism of the Bottom Plate along the Empty Lane of Deep Mining and the Control Technology of the Bottom Drum

Pang

Niu

et al. 2022

Geofluids

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“…According to research on Qianqiu coal mine 18 – 20 , Tongxin coal mine 21 , 22 , Buertai coal mine 1 , 23 – 26 , and other mines in China, thick and hard strata have a large impact on rock mass stress around the working face 27 , 28 . The surrounding rock stress increases rapidly, which leads to rock bursts frequently occurring on the working face and roadways 29 , 30 . According to China’s statistical data, roof accidents have the highest rates of all coal mining accidents, which seriously threatens the safety and health of employees 31 , 32 .…”

Section: Introductionmentioning

confidence: 99%

Influence of stress distribution in coal seams of non-uniform extremely thick key stratum and disaster-causing mechanisms

Ning

Zhu

Xie

et al. 2022

Sci Rep

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This paper analyzes the influence of the overlying extremely thick primary key stratum on the strong mine pressure hazard at the large mining face in Gaojiapu coal mine. The analysis of the distribution characteristics of the primary key stratum in the Gaojiapu coal mine reveals the bow-shaped structural characteristics of the overlying thick primary key stratum. An elastodynamic model was developed using the variational method to calculate and analyze the influence of the movement of the primary key stratum on the stress and energy of the underlying weak rock. The results show that the arch structure of the overlying extremely thick primary key stratum can significantly affect the distribution pattern of stress and strain energy in the coal body, and the stress and strain energy in the coal body are transferred to the middle of the coal column, and the middle region of the coal column enters a high stress state. These results suggest that the change in thickness of the overlying primary key stratum at Gaojiapu in the coal column area is a major factor in the frequent occurrence of impact ground pressure events at the mine. This study explains the causes of frequent impact ground pressure in the lower coal rock mass of the extremely thick primary key stratum, and provides a reference for the prevention and control of impact hazards in the extremely thick primary key stratum.

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“…However, obvious defects are shown in the layout of double roadways. During the service period, the auxiliary roadways have experienced many times of mining disturbance, which is prone to severe contraction of roadway section, Sustainability 2021, 13, 4412 2 of 14 deformation, fracture, and instability, and even cannot continue to serve for the working face in the next section. At this time, it is the only choice to re-excavate the return air roadway of the next working face, and the selection of roadway excavation position becomes very important.…”

Section: Introductionmentioning

confidence: 99%

“…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. Wu [14] studied the initiation, propagation, and failure of cracks within this gob-side coal pillar during its formation by using the methods of field tests and numerical modeling.…”

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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Deformation Caused by Dynamic Load and Support Requirements in a Deep Gob-Side Entry Rock Mass

Cited by 4 publications

References 10 publications

Study on the Deformation Mechanism of the Bottom Plate along the Empty Lane of Deep Mining and the Control Technology of the Bottom Drum

Study on the Deformation Mechanism of the Bottom Plate along the Empty Lane of Deep Mining and the Control Technology of the Bottom Drum

Influence of stress distribution in coal seams of non-uniform extremely thick key stratum and disaster-causing mechanisms

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

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