Numerical Study on Dynamic Performance of End-anchored Rockbolt under Impact Loading

Zhao, Chen; Zhang, Yubao; Wu, Wei; Zhang, Zijian; Zhao, Tianfeng

doi:10.1590/1679-78256458

Cited by 3 publications

(2 citation statements)

References 20 publications

(25 reference statements)

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“…It can reduce the bearing capacity of surrounding rock, even leading to the failure of the roadway support system 19 . Rockbolts are widely used in mining and tunnel engineering as permanent or temporary structural components to control the deformation and failure of the underground excavation 20–25 . The large‐diameter borehole can lead to damage stress in advance and decrease the strength of coal sidewalls 26 .…”

Section: Introductionmentioning

confidence: 99%

“…19 Rockbolts are widely used in mining and tunnel engineering as permanent or temporary structural components to control the deformation and failure of the underground excavation. [20][21][22][23][24][25] The large-diameter borehole can lead to damage stress in advance and decrease the strength of coal sidewalls. 26 The decrease of coal strength will affect the anchoring effect of rockbolt.…”

Section: Introductionmentioning

confidence: 99%

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Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

Yin

Zhang

et al. 2023

Energy Science & Engineering

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The pressure relief with large-diameter boreholes is one of the effective methods to prevent coal bumps in deep coal roadway. An unreasonable pressure relief design can cause the rockbolt support failure and aggravate the deformation of the surrounding rocks. In this paper, a coupling model of roadway sidewall considering borehole pressure relief and rockbolt support was established. The influence of the destressing borehole diameter on the rockbolt located in the plastic zone and the roadway deformation was studied by theoretical calculation and numerical simulation. The results show that there is a critical zone of the borehole diameter for the influence on the rockbolt normal stress and roadway convergence. When the destressing borehole diameter exceeds the critical zone, the rockbolt normal stress decreases sharply. Considering the existence of the broken zone in the surrounding rock, the bolehole diameters in the critical zone increase with the increase of the distance between the borehole and the rockbolt, the residual strength, and decrease with the increase of initial stress. In the engineering analysis, with the increase of the destressing borehole diameter, the ultimate pullout force of rockbolt decrease, and the plastic zone of surrounding rock, the roadway deformation, the maximum axial force, and slippage of the rockbolt all increase. Therefore, to better keep the stability of the surrounding rock in coal roadway, the borehole pressure relief needs to be coordinated with the rockbolt support. The destressing borehole diameter in the pressure relief design should not be greater than the critical zone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

Yin

Zhang

et al. 2023

Energy Science & Engineering

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A Study on Stress Redistribution of Roadway Sidewall after Hydraulic Fracturing in Coal Bumps Prevention

Yin

Tang

Zhang

et al. 2022

Shock and Vibration

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Hydraulic fracturing is an effective mean to prevent coal bumps in deep coal mining. The calculation of stress redistribution of coal sidewall after hydraulic fracturing can evaluate the fracturing effect and provide a reference for the hydraulic fracturing scheme design. In this paper, a theoretical model of stress redistribution of roadway sidewall after hydraulic fracturing is established with considering the effect of crushing zone. And the influences of the water injection length and the fracturing radius on the stress redistribution of roadway sidewall are investigated. The results show that the water injection section should be set at a deeper position with considering the existence of the crushing zone. The coal roadway sidewall after hydraulic fracturing is divided into five zones: the crushing zone, the shallow plastic zone, the pressure relief zone, the deep plastic zone, and the elastic zone. The stress redistribution law is obviously affected by the water injection section length and fracturing radius. With the increase of water injection length or fracturing radius, the pressure relief effect is more evident, but the axial force of rockbolt increases gradually. In order to acquire a better pressure relief effect, the matching of the water injection length and the fracturing radius should be considered crucially in the hydraulic fracturing design for preventing coal bumps.

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Study on a Transparent Similar Rock-Anchoring Structure under Impact Tests and Numerical Simulation Tests

Zhu¹,

Liu²,

An³

et al. 2022

Applied Sciences

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Interface slip is one of the main failure forms of an anchor structure, but the debonding slip process of rockbolt cannot be directly observed under impact load, so it is important to study the failure mechanism of the interface debonding of an anchor structure. For this purpose, a kind of transparent similar rock-anchoring structure and a new rockbolt impact load test system were developed. The debonding process of the anchor structure was carried out based on the system and Particle Flow Code (PFC) simulation test. The main conclusions are as follows: Axial force of rockbolt decreases progressively from the load end to the other end, but the shear stress of the interfaces increases at the early stage and then decreases. The majority of shear stress is at I interface compared to shear stress at II interface. The crack in the transparent sample occurs first in the middle of the sample, then extends to the local position of the two interfaces and finally penetrates all cracks, and the debonding failure mode is dual-interface mixed. According to laboratory tests and PFC simulation tests, the crack growth process can be divided into three stages. The results of the PFC simulation tests are similar to those of the laboratory impact tests of rockbolt.

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Numerical Study on Dynamic Performance of End-anchored Rockbolt under Impact Loading

Cited by 3 publications

References 20 publications

Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

A Study on Stress Redistribution of Roadway Sidewall after Hydraulic Fracturing in Coal Bumps Prevention

Study on a Transparent Similar Rock-Anchoring Structure under Impact Tests and Numerical Simulation Tests

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