Laboratory and field investigations of different bolting configurations for coal mine roadways in weak coal strata

Yu, Wenxin; Wu, Genshui; Pan, Bao; Wang, Chunlai; Li, Ké; Liao, Zhihui

doi:10.1007/s10064-021-02477-y

Cited by 16 publications

(5 citation statements)

References 27 publications

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“…The primary control ideas are as follows: 1. Anchor bolt (cable) supports with different support parameters are adopted for the "three zones" of surrounding roadway rock, and the anchorage zone of anchor bolt-surrounding rock coupling is formed through anchor bolt (cable) support to improve the surrounding rock environment [42,43]; 2. To improve the bearing capacity of the broken coal and rock mass, the solid coal side (Part III) of the tailgate and the broken coal pillar-adjacent gob are supported by grouting.…”

Section: Main Control Of the Surrounding Rock In The Tailgatementioning

confidence: 99%

Study on the Stability of Coal Pillars in a Gob-Side Two-Entry Arrangement of Different Layers in Fully Mechanized Caving and the Zonal Linkage Control of “Heteromorphic” Surrounding Rock

Gao

Chen

et al. 2023

Processes

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To solve the problem of considerable deformation of the tailgate in a fully mechanized caving face, the position of the main roof fracture line is first obtained by theoretical calculation, combined with the results of a similar simulation test and numerical simulation analysis. The width of the section coal pillar in the tailgate is determined to be 11.5 m. Based on the distribution characteristics of deviatoric stress and the plastic zone of surrounding rock, combined with the location characteristics and geological conditions, a new zoning control design approach is proposed, a “two pillars, three zones, and three parts” arrangement for the surrounding rock of the tailgate. The targeted two-entry support design is carried out following common engineering practices. Mine pressure monitoring data were used to verify the results of the new two-entry design. The comparison shows that the supporting technology can effectively control the considerable deformation of the surrounding rock, improving stability for regular mining production.

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Section: Main Control Of the Surrounding Rock In The Tailgatementioning

confidence: 99%

Study on the Stability of Coal Pillars in a Gob-Side Two-Entry Arrangement of Different Layers in Fully Mechanized Caving and the Zonal Linkage Control of “Heteromorphic” Surrounding Rock

Gao

Chen

et al. 2023

Processes

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“…Huang et al 35 and Chen et al 36 studied the influence of loading rate and coal-rock height ratio on the mechanical properties of coal-rock composite specimens and obtained fracture criteria for three-dimensional interface cracks. In addition, Yu et al 37 studied the failure mechanism of anchor structures composed of coal-rock-anchor. Chen et al 38 analyzed the nonlinear evolution characteristics of energy during the loading process of coal-rock formations, established the softening constitutive relationship of interfaces, and obtained the relationship between roughness and interface crack fracture characteristics.…”

Section: Introductionmentioning

confidence: 99%

The failure behavior of coal-rock combined body under compression-shear loading

Li,

Yuan

et al. 2024

Science Progress

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As shallow coal reserves continue to deplete rapidly, deep mining has become an unavoidable course of action. In the process of deep coal mining, affected by blasting, mining, and excavation, the coal-rock interface often encounters the action of compression-shear composite load. The interface crack directly affects the stability of the coal-rock structure. Uniaxial compression experiments have been conducted on rock and coal-like material with pre-existing interfacial oblique cracks to study the crack propagation criterion of the rock and coal-like material interface. An image acquisition system is used to record the surface speckle field of the whole process of specimen failure. The strain fields and stress intensity factor of the sample at different times are obtained by digital image correlation. At the same time, the stress field near the crack tip is calculated. The results show that with the increase of loading, two strains of localization bands are formed on the surface of the specimen. One of the strain-localized bands starts at the lower tip of the prefabricated crack and propagates along the vertical interface. The other starts at the upper tip of the prefabricated damage and propagates along the interface direction. It can be seen that the lower tip of the prefabricated crack enters into the crack fracture process zone earlier than the upper tip. The strain localization band narrows gradually with the load increase, and then macro cracks appear. The initiation of two tips is suitable for different fracture criteria. The lower tip is dominated by the maximum circumferential tensile stress, and the upper tip is dominated by shear stress. The specimens eventually fracture along the interface. The evolution of the strain field during the failure process of rock and coal-like material can reflect the generation and propagation of the crack.

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“…The instability of the fault structure and the fragmentation of the surrounding rock will change the pressure step of the overlying rock, the stability of the masonry beam structure and the stress distribution of the surrounding rock, etc. [1][2][3][4]. The theories of structural modeling, destabilization criteria, energy transfer criteria, and stability control of surrounding rock for independent faults have been gradually improved.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Stratum Instability and Dynamic Deformation under Discontinuous Boundary Conditions

Guo,

Yu,

et al. 2024

Applied Sciences

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A fault disrupts the continuity of the rock strata in a mining area. To study the law governing the fracture of overlying strata in mining areas under discontinuous boundary conditions, the overlying strata were redefined and grouped based on the activity characteristics of each rock layer during the overall movement of the overlying strata. The activity patterns of different layers of the fault were obtained through the movement and failure forms of each group of rock layers. The relationship among the size of the coal pillar at the boundary of the fault, the dip angle of the fault, and the movement angle of the rock strata was considered. A model of the spatial relationship between the overlying rock movement zone of the quarry and the fault surface was established. The limit equilibrium equations of the key layer in the fault zone before breaking were established based on the tensile strength of the rock layer. In addition, the mechanical slip instability criterion and the deflection instability criterion of the discontinuous-boundary rock mass are given herein. Based on a field case, a double criterion was used to determine the initiating activated rock layers of the fault in the cases where the fault dip was smaller than the rock movement angle. Rock movement during excavation was simulated by similar simulation tests, and different levels of rock movement patterns in the boundary fault zone were focused on monitoring and analyzing. The stress and displacement changes in different rock layers in the fault zone were analyzed with numerical simulation results. The results show the following: if the dip angle of the fault is smaller than the movement angle of the rock layer, the delamination space of the fault surface is mainly distributed in the bending and sinking zone of the overlying rock; with an increase in the working-face advancement distance, the vertical pressure of the upper part of the fault gradually decreases, and the stress-concentration area in the middle and lower part of the fault gradually increases; the rock layer of the upper part of the fault, which is mainly composed of the key stratum, is the main area of activation of the fault.

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Laboratory and field investigations of different bolting configurations for coal mine roadways in weak coal strata

Cited by 16 publications

References 27 publications

Study on the Stability of Coal Pillars in a Gob-Side Two-Entry Arrangement of Different Layers in Fully Mechanized Caving and the Zonal Linkage Control of “Heteromorphic” Surrounding Rock

Study on the Stability of Coal Pillars in a Gob-Side Two-Entry Arrangement of Different Layers in Fully Mechanized Caving and the Zonal Linkage Control of “Heteromorphic” Surrounding Rock

The failure behavior of coal-rock combined body under compression-shear loading

Mechanism of Stratum Instability and Dynamic Deformation under Discontinuous Boundary Conditions

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