Bolt–Cable–Mesh Integrated Support Technology for Water Drenching Roadway in Thick Coal Seam

Jia, Ce; Li, Sheng; Fan, Chunhua; Luo, Ming‐Xing; Zhou, Lijun; Pu, Ziang; Yang, Lei

doi:10.1021/acsomega.2c05650

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…The numerical model was built based on FLAC3D software (Jia et al, 2022;Liu et al, 2022b;Sun et al, 2022;Zhu et al, 2023). The model was divided into a total of 574860 units and 620309 nodes.…”

Section: Simulation Scheme and Model Buildingmentioning

confidence: 99%

Research on the coupled support technology of a composite rock beam-retained roadway roof under close coal seams

Li,

Yang,

Zhu

et al. 2023

Front. Ecol. Evol.

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IntroductionThe technology of gob-side entry retaining without coal pillars in close (distance) coal seams is still immature, and the roof control and support technology in this case is not perfect.MethodsIn this paper, the coupled support technology of a composite rock beam roof under close coal seams is systematically studied by using theoretical analysis, numerical simulation and field test.ResultsBoth the floor slip calculation results and numerical simulations indicate that the vertical failure depth in the plastic zone of the #8 coal seam has not penetrated the roof of the #9 coal seam after mining, which is consistent with the field electronic imaging results. A theoretical formula for a composite rock beam model anchored by high-prestressed anchor cables was derived, and a formula for the optimal spacing of anchor cables under noncompressive shear failure of the roof was obtained. Identification of the internal stress hazard region of the rock beam provides a basis for determining the locations of vertical support. Through numerical simulation of different support schemes, including roof cutting, arrangement of high-prestressed anchor cables, and setting up of vertical supports, roof cutting was found to effectively reduce the stress of supporting structure and roof pressure. Setting up of vertical supports can reduce the roof convergence by 25.2%, and coupling with anchor cables can reduce the convergence by more than 49.1%. The feasibility of this support scheme was verified through field tests, with a maximum convergence of 99 mm between the roof and floor.DiscussionThis two-way verification approach, in which the damage degree of the roof of a close coal seam is analyzed through multiple means, targeted support plans are proposed, the support mechanisms are explored, and feedback is conducted through field tests, plays a certain guiding role in solving roof control of the gob-side entry retaining under similar geological conditions.

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Section: Simulation Scheme and Model Buildingmentioning

confidence: 99%

Research on the coupled support technology of a composite rock beam-retained roadway roof under close coal seams

Li,

Yang,

Zhu

et al. 2023

Front. Ecol. Evol.

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Experimental study on the influence of water–rock interaction on the time-varying characteristics of coal rock mass

Yang,

Li,

Liu

et al. 2024

Environ Geochem Health

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Failure characteristics and control technology of surrounding rock during roadway passing collapse column

Jia,

Fan,

et al. 2024

Sci Rep

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The collapse column may result in failure of the surrounding rock during roadway excavation. It is of considerable importance to elucidate the failure characteristics and develop the corresponding control technologies for the surrounding rock. A discrete fracture mesh (DFN) and a strain-softening constitutive model are employed to simulate the properties of a collapse column. The stress zoning model was developed to characterize the rock surrounding the collapse column. Additionally, the zoned support technology was proposed to stabilize the roadway surrounding the rock. From the center outward, the results indicate that the collapse column can be individually divided into four zones: an internal impact zone of the collapse column, a stress decreasing zone, a stress increasing zone, and an initial stress zone. Upon the visibility of the collapse column, the tensile failure occurs in the roof, leading to a decrease in stress in front of the roadway and an increase in stress on both sides of the collapse column. The collapse amplifies the range of plastic failure by inducing an overlap between the roof stress and the stress elevation zones. The impact zone of the collapse column was reinforced by means of an integrated support system consisting of “pre-grouting, bolt cable mesh, and steel shed”. The “bolt cable mesh” provides integrated support beyond the area affected by the collapse column. Following a 20d excavation period, the roof and the two sides were stabilized, with an effectively controlling for the surrounding rock.

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Bolt–Cable–Mesh Integrated Support Technology for Water Drenching Roadway in Thick Coal Seam

Cited by 4 publications

References 39 publications

Research on the coupled support technology of a composite rock beam-retained roadway roof under close coal seams

Research on the coupled support technology of a composite rock beam-retained roadway roof under close coal seams

Experimental study on the influence of water–rock interaction on the time-varying characteristics of coal rock mass

Failure characteristics and control technology of surrounding rock during roadway passing collapse column

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