Support design and practice for floor heave of deeply buried roadway

Liu, Chaoke; Ren, Jianxi; Gao, Bingli; Song, Yongjun

doi:10.1088/1755-1315/64/1/012032

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The mechanical model of floor failure was developed by Liang et al [8,9] using limit equilibrium theory and verified the accuracy of the model by combining numerical simulation and field monitoring results. In addition, considering the different load forms, Cheng et al [10,11] established the mechanical model of floors under different loads, which provided a basis for roadway support design, considering the structural form of the floor, using a mechanical model. Sun et al [12][13][14] determined what mechanical conditions must be met for the floor to remain stable.…”

Section: Introductionmentioning

confidence: 99%

Support Control Design of Mining Roadway under Goaf of Close-Distance Coal Seam

2023

Sustainability

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Coal resources have always been the focus of attention in the field of sustainable development. Based on the problem of surrounding rock control in close-distance coal seams, first, a mechanical model of floor failure was established based on the 29204 working face in Dongqu Mine; the failure mechanism of the floor was revealed by the zero displacement line, and a method to judge the occurrence state of the roof in the lower coal seam was put forward. Furthermore, by FLAC3D numerical simulation software, the mechanical model is verified, and the optimal support parameters are optimized, and the optimal water–cement ratio and grouting pressure are determined to be 0.6 and 3 MPa respectively. The application shows that the roof displacement is reduced by about 73.48% compared with the control group. Compared with the control group, the cable stress decreased by about 50.68%, and the application effect is remarkable. The research results provide an effective solution to ensure the sustainable development of coal resources and disaster prevention.

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Section: Introductionmentioning

confidence: 99%

Support Control Design of Mining Roadway under Goaf of Close-Distance Coal Seam

2023

Sustainability

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“…Alternatively, floor heave can also be reduced by strengthening the floor rock mass. The strength of the floor rock mass can be improved by installing floor bolts [22][23][24], constructing a concrete inverted arch [25,26], or modifying floor grouting [27,28].…”

Section: Introductionmentioning

confidence: 99%

Evolution Mechanism and Control of Floor Heave in the Deep Roadway with Retained Bottom Coal

Suo

Gong

et al. 2023

Geofluids

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Roadways with retained bottom coal are common in thick coal seam mining, and floor heaving is a prominent problem. In this study, based on the interaction between the floor and two sides of the roadway-surrounding rock, a Winkler elastic foundation beam model is established to analyze the floor heave problem. A 3DEC model was used to analyze the failure range, failure mode, and migration law of the floor-surrounding rock with different bottom coal thicknesses and coal body strengths. The results show that (1) an increase in the thickness of the bottom coal results in a decrease in the stiffness of the roadway side coal body (the foundation of the supporting rock layer) and an increase in the bending deformation range, the amount of floor rock beam deformation, and the extrusion force. This leads to an expansion in the range of the sides of the coal body that are squeezed by the floor rock layer, resulting in additional failure and deformation of the coal body sides. Therefore, the damage to the floor rock layer is extended and increased. (2) The expansion of the floor pressure-bearing arch and surrounding rock in the arch are the causes of floor heave in the deep coal roadway with retained bottom coal. (3) Because of an increase in the thickness of the bottom coal and a decrease in the coal body strength, the floor pressure-bearing arch expands to the deeper part; thus, the range of surrounding rock in the arch with deformation and failure increases, resulting in an increase in floor heave. The field practice indicates that the support strategy of the “high prestressed strong rock bolt (cable) supporting two sides and bottom corners in time” can effectively control the floor heave of a roadway with retained bottom coal.

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“…Although the protective coal pillar is left, the floor heave is still the most serious problem in roadway deformation. At present, generally, the methods of undercutting the floor, reinforcement, or pressure relief are used to control the floor heave [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study on Presplitting Blasting the Roof Strata of Adjacent Roadway to Control Roadway Deformation

Yang

et al. 2019

Shock and Vibration

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In order to solve the problem of roadway deformation based on the theory of “short cantilever beam by roof cutting,” the method of “pressure relief by roof cutting in the adjacent roadway” is proposed. Through presplitting blasting the roadway hard rock layer, the stress propagation path is cut off, and the surrounding rock stress environment of the roadway is improved, to achieve the purpose of controlling the deformation of the roadway caused by stress. Through theoretical analysis, it is determined that the depth of the presplitting blasthole is 17 m, and the angle with the vertical direction is 10°. Based on in situ measurements and tests, by presplitting blasting the roof strata of the adjacent roadway, the maximal value of the working resistance of the hydraulic support in the presplitting blasting side of the working face decreased by 24.9%, and the average volumes of the maximum floor heave, the maximum roof subsidence, and the maximum ribs displacement were reduced by 50.1%, 34.9%, and 41.7%, respectively. This method completely changes the traditional thought patterns of “reinforcing support” to control roadway deformation from “strong support” to “pressure relief.” It provides a new idea for controlling the roadway deformation.

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Support design and practice for floor heave of deeply buried roadway

Cited by 3 publications

References 3 publications

Support Control Design of Mining Roadway under Goaf of Close-Distance Coal Seam

Support Control Design of Mining Roadway under Goaf of Close-Distance Coal Seam

Evolution Mechanism and Control of Floor Heave in the Deep Roadway with Retained Bottom Coal

Study on Presplitting Blasting the Roof Strata of Adjacent Roadway to Control Roadway Deformation

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