Theoretical Calculation and Analysis on the Composite Rock-Bolt Bearing Structure in Burst-Prone Ground

Liu, Cheng; Zhang, Yidong; Ji, Ming; Cui, Mantang; Zhang, Kai; Zhang, Minglei

doi:10.1155/2015/434567

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…As shown in Figure 1, the ranges of anchored bearing structure, plastic zone excluding anchored bearing structure, and elastic zone are R 0 ≤ r ≤ R 0 + b, R 0 + b < r ≤ R p , and r > R p , respectively. In addition, R 0 , b, and R p represent separately the roadway radius, thickness of anchored bearing structure, and radius of plastic zone, which are given by Cheng et al [23]…”

Section: Mechanical Modeling Methodsmentioning

confidence: 99%

“…However, η > 1 means that optimization of existing support parameters and improvement for energyabsorption of support system. It is because of the anchorage effect of the support system that the active bearing structure of anchored roadway can be formed [23]. Once the support system is damaged, the entire bearing structure will be destructed.…”

Section: Roadway Surface After Convergencementioning

confidence: 99%

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A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

Wang,

2023

Advances in Civil Engineering

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Mining roadway is the main occurrence area of coal bursts in underground coal mining. A good understanding of the failure process of elastic zone and energy evolution inducing instability of support structure can offer useful insight into the coal burst mechanism. This study proposes a novel coal burst criterion of anchored roadway surrounding rock under dynamic disturbance through mechanical modeling. The coal burst hazard and its main controlling factors were studied based on case analysis, and then the application of novel criterion in coal burst prevention and control was clarified. Results show that the existence of residual energy Ur of elastic zone is a prerequisite for coal burst of the roadway. The roadway support with ultimate value Us of absorbed energy needs to resist and absorb the kinetic energy Uk released from a dynamic failure of elastic zone and the energy Up imposed by impact-induced convergence of surrounding rocks on a support system, and the novel coal burst criterion is proposed as Uk + Up > Us. Under the same support conditions, the roadway roof is more prone to dynamic failure. According to the influences of main controlling factors on coal burst hazard, the corresponding prevention and control measures can be taken from improvement for the anti-impact capability of support, pressure relief in surrounding rocks, reduction of dynamic-loading energy, and roadway restoration after coal burst.

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Section: Mechanical Modeling Methodsmentioning

confidence: 99%

Section: Roadway Surface After Convergencementioning

confidence: 99%

A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

Wang,

2023

Advances in Civil Engineering

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“…In addition, the elastic elongation of the bolt is also considered. The rock bolt interaction is simulated in the initial and final states (Cheng et al, 2015;Chang et al, 2019). Zhou et al proposed a numerical model based on the double exponential curve shear slip-model of the anchorage interface and the linear strengthened elastoplastic constitutive model of the bolt, and verified the model through the pull-out test (Cui et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Stress Distribution Law of Full-Length Anchorage Bolt in Rectangular Roadway

Pang

et al. 2022

Front. Earth Sci.

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To study the evolution law of axial force and shear stress of a full-length anchorage bolt in a rectangular roadway during roadway driving and working face mining, based on the stress analysis of the bolt, considering the elastic parameters and geometric size of the bolt, the effect of a bearing plate on surrounding rock, roadway cross-section shape, roadway deformation degree, and roadway elastic parameters, elastic mechanics and mathematical analysis methods were used to establish the mechanical model describing the interaction between the bolt and surrounding rock, and the mechanical formulas for calculating the axial force and shear stress of the bolt were derived. Taking the mining roadway of 1,131(1) working face in the Zhujidong coal mine of the Huainan mining area as the engineering background, the axial force and shear stress of the bolt in the middle of the roof and side of the rectangular roadway with the advance of driving face and working face were analyzed. The mechanical model and theoretical analysis results are verified by installing force measuring bolts with the same mechanical properties as the field and observing the real axial force distribution of the bolts.

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“…The conclusion that bolting improves the load-bearing capability of the surrounding rock has been stated and confirmed in many studies. For roadways supported by bolts in the rock, different support structures for the surrounding rock have been suggested: e.g., the surrounding rock bearing circle proposed by Kang ( 1996 , 1997 ), the internal and external bearing circle proposed by Li ( 2008 ), the support structure inside the roadway’s coal roof proposed by Zhang and Li ( 1999 ), the compound arch bearing structure by Yu et al ( 2010 ), and reinforced rock by Song and Mu ( 1997 ), among others (Wu and Chai 1997 ; Zhu et al 2000 ; Zhang et al 2015 ; Cheng et al 2015 ).However, few studies have investigated the load-bearing characteristics of a structure formed from both bolts and the surrounding rocks and the effect of the structure on the overall load-bearing capacity of the surrounding rocks. There are even fewer studies considering the effect of the bolt parameters on the load-bearing characteristics of such a structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental studies on the effects of bolt parameters on the bearing characteristics of reinforced rock

Liu

Zhang

et al. 2016

SpringerPlus

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Roadways supported by bolts contain support structures that are built into the rock surrounding the roadway, referred to as reinforced rocks in this paper. Using physical model simulation, the paper investigates the bearing characteristics of the reinforced rock under different bolt parameters with incrementally increased load. The experimental results show that the stress at the measurement point inside the structure varies with the kinetic pressure. The stress increases slowly as the load is initially applied, displays accelerated growth in the middle of the loading application, and decreases or remains constant in the later stage of the loading application. The change in displacement of the surrounding rock exhibits the following characteristics: a slow increase when the load is first applied, accelerated growth in the middle stage, and violent growth in the later stage. There is a good correlation between the change in the measured stress and the change in the surrounding rock displacement. Increasing the density of the bolt support and the length and diameter of the bolt improves the load-bearing performance of the reinforced rock, including its strength, internal peak stress, and residual stress. Bolting improves the internal structure of the surrounding rocks, and the deterioration of the surrounding rock decreases with the distance between the bolt supports.

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Theoretical Calculation and Analysis on the Composite Rock-Bolt Bearing Structure in Burst-Prone Ground

Cited by 4 publications

References 4 publications

A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

Stress Distribution Law of Full-Length Anchorage Bolt in Rectangular Roadway

Experimental studies on the effects of bolt parameters on the bearing characteristics of reinforced rock

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