Combined support technology for main roadway passing through goaf: A case study

Chen, Dongdong; Zhang, Qing; Xie, Shengrong; Jiang, Zheng; Li, Yubo; Gao, Mingming; Li, Hui; Wu, Xiaoyu; Wang, En; Shi, Songhao; Wang, Long

doi:10.1002/ese3.787

Cited by 8 publications

(5 citation statements)

References 60 publications

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“…To analyze the influence of the bolt-anchored body on bearing characteristics of SR more reasonably, several scholars adopted the finite element method (FEM) to study the stability of bolt-anchored SR, which took into account the bolt material and mechanical parameters [14][15][16], anchoring angle, and tunnel section shape [17][18][19]. Lyu et al [20] took the roof of a rectangular coal roadway as an example and simulated the supporting effect of the roof SR for various bolt layouts.…”

Section: Related Studiesmentioning

confidence: 99%

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Shi

et al. 2021

Advances in Civil Engineering

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The support strength of surrounding rock in deep mining roadways can be significantly improved by replacing the end bolt anchorage with a full one. The support effects of both types of anchorage and the axial stress distribution characteristics in anchored bolt bodies were assessed via the indoor pull-out test, simulated via the FLAC3D software, and verified by field measurements. The stability and variation patterns of the axial force, as well as the evolution law of bearing characteristics of surrounding rock, were analyzed. The results indicate that the polymorphic deformations of deep mining roadway surrounding rock and the bolt support body interact synchronously. The axial force evolution trend in bolt bodies with end anchorage revealed by field tests was consistent with the laboratory test results, in contrast to that of full anchorage. Although stress distribution laws in both sides of the mining roadway were the same for both types of anchorage, the vertical stress peak and damage range of full-anchored surrounding rock slightly exceeded those of the end-anchored one. The anchored area bearing a higher load alleviated the stress concentration of the surrounding rock. Since the deformations in fully and end anchored surrounding rocks increased gradually and sharply, respectively, the full anchorage is more conducive to deformation moving control of deep mining roadway surrounding rock. The research results can provide theoretical guidance for the design and construction of deep mining roadway bolt support.

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Section: Related Studiesmentioning

confidence: 99%

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Shi

et al. 2021

Advances in Civil Engineering

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“…Liu 20 and Ru 21 disclosed that roadway asymmetry deformation is caused by the non-uniform stress in the coal pillar of the upper coal seam. Chen 22 explained the main reasons for great di culty in supporting the roadway under a mined-out area, that is, the caved waste is not connected with the unsupported roof and the stress distribution in the surrounding rocks is complex owing to stress superimposition for many times. Wu 23 unraveled that the roof and pillar ribs under a goaf are the determinant parts for surrounding rock control.…”

Section: Introductionmentioning

confidence: 99%

Technique and practice of surrounding rock control for the roadway driven under the goafs of small collieries and heading for adjacent advancing face

Niu,

Wang,

Wang

et al. 2024

Preprint

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Aiming at the problems of complex stress and large deformations in the surrounding rocks of the roadway driven under the goafs of small collieries and heading for adjacent advancing coal face, by numerical modeling and field practice, the failure characteristics of the overlying coal and rocks were investigated, and the stopping and resuming times of the roadway excavation were identified. A zoning-based reinforcement technique was put forward and applied in engineering practice. The results showed that (1) The roadway roof was divided into four zones: “solid coal zone”, “residual pillar zone”, “roof caved zone”, and “roof un-caved zone”. (2) It was determined that the roadway excavation was stopped when the unmined distance between the return airway face and the 32101 working face was 70 m. After the 32101 working face passed the return airway face by 90 m, the roadway driving was restarted. (3) I.e. cable reinforcement for the “residual pillar zone” and bolt-wire mesh-cable-shotcreting-groutingreinforcement for the “roof failure zone” (“roof caved zone” + “roof un-caved zone”). The field observation results indicated that the maximum amount of the roof-to-floor convergence and the wall-to-wall convergence was 97 mm and 69 mm, respectively, which ensured the safety of roadway excavating.

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“…The derivation of a boundary equation for a plastic zone of surrounding rock and the evolution of plastic zone morphology [11,12] are among the notable advancements towards understanding the behavior of deepburied roadways. Moreover, the exploration of rheological deformation problems and the development of control technologies like the new and e cient jet grouting technology [13][14][15] further augment the repertoire of strategies for addressing RNGs stability issues.…”

Section: Introductionmentioning

confidence: 99%

A hierarchical roof control and pressure relief method for Gob-side Entry Retaining with Compound Roof

Dong

2024

Preprint

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Gob-side entry retaining is effective for preventing gas accumulation, extracting pressure relief gas, and removing gas from the goaf. This study, based on the No. 312 mining area of Longtan coal mine, aims to clarify roof cutting and pressure relief foundations, calculate key parameters, and propose a roof control method. Using field detection, theoretical analysis, and numerical simulation, the dynamic response of roof drilling and fracture mechanics of hard rock strata were examined. Results indicate that the hard rock stratum dictates the pressure relief mode and difficulty. The failure zone distribution in the hard rock stratum is directly influenced by roof cutting borehole density. Consequently, pressure relief methods, key parameters, and roof control measures under different roof conditions were identified. Engineering applications and monitoring show that the hierarchical roof control and pressure relief method ensures rock stability and significantly enhances pressure relief and roadway retention efficiency.

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Combined support technology for main roadway passing through goaf: A case study

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 8 publications

References 60 publications

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Technique and practice of surrounding rock control for the roadway driven under the goafs of small collieries and heading for adjacent advancing face

A hierarchical roof control and pressure relief method for Gob-side Entry Retaining with Compound Roof

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