Investigating the anchorage performance of full-grouted anchor bolts with a modified numerical simulation method

Chen, Jianhang; Zeng, Banquan; Liu, Lei; Tao, Kangming; Zhao, Hongbao; Zhang, Cun; Zhang, Junwen; Li, Danqi

doi:10.1016/j.engfailanal.2022.106640

Cited by 37 publications

(14 citation statements)

References 30 publications

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“…Zhao et al proposed that under the infuence of self-weight and roof pressure, the coal wall was mainly in the form of tension failure and shear failure, and a method to determine the support working resistance based on the control of the roof and coal wall was given [25][26][27]. Chen et al found through the compressive strength test that when the layering was developed, and there were many weak planes in the coal seam, the coal seam with a low hardness coefcient was more likely to lead to rib spalling, and the fexible reinforcement technology for the prevention and control of ultra-high rib spalling was proposed [1,28,29].…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Zheng

Sun

2022

Shock and Vibration

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In order to explore the dynamic evolution of overburden rock movement and mining-induced stress of an ultra-high working face, taking the ultra-high working face of a 2# thick coal seam in a shallow mine field as the engineering background, this paper analyzes the distribution characteristics of principal stress, mining stress evolution characteristics, overburden rock migration characteristics, and overburden rock caving characteristics of a shallow overburden rock ultra-high working face under different advancing distances and calculates by FLAC3D numerical simulation software. The results show that when the working face advances to 200 m, the stress concentration degree presents a stable trend. The concentration degree and variation gradient of the maximum principal stress are greater than those of the minimum principal stress, while the range of the peak ahead coal wall is smaller than that of the minimum principal stress peak leading coal wall. With the increase of the advancing range, the stress recovery degree gradually increases, and the maximum principal stress recovery degree is higher than the minimum principal stress. When the working face advances to 300 m, the maximum principal stress restores to 66% of the initial value, while the minimum principal stress is only restored to about 50%, and the surface subsidence degree reaches 2.5 m.

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Section: Introductionmentioning

confidence: 99%

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Zheng

Sun

2022

Shock and Vibration

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“…Figure 5c presents a steel ladder beam with two neighboring bolts. The resin residue is still adhered on the bolts, which demonstrates an effective bond of resin and bolt (Chen et al, 2022). The entry deformation and the support distortion are very similar to the actual case in the engineering sites.…”

Section: Examples Of 3dp Applications In Mining Researchmentioning

confidence: 99%

“…In the past studies, the small‐scale bolting test on joint‐separated rock mass was always a big challenge, since researchers used different materials with different mechanical properties and geometries to simulate the bolts (Chen et al, 2022; Lin et al, 2020; Wu et al, 2019). 3DP provides a manufacturing technique to overcome those drawbacks.…”

Section: Examples Of 3dp Applications In Mining Researchmentioning

confidence: 99%

Additive manufacturing technology in mining engineering research

Feng

Carvelli

2022

Deep Underground Science and Engineering

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Nowadays, additive manufacturing, or 3D printing (3DP), though not a new technology in many industrial fields, is still relatively novel in mining engineering. This study explored the application of 3D metal printing, 3D polylactic acid/ acrylonitrile butadiene styrene printing, and 3D concrete printing in coal mining. Some examples of physical models established via 3DP technologies were studied in detail, namely, 3DP bolts, 3DP steel ladder beams, 3DP face plates, and 3DP metal arches, which were installed in scaled 3DP concrete prototype models of coal mine excavation. Through the comprehensive laboratory loading tests, the models could simulate the damage scenario highly similar to the real failures. The results show that the 3D printed physical models greatly improved the accuracy and reliability of experiments. On this basis, the conceptual design of a 3DP machine for physical models was proposed, which had the potential of resembling the strata deformation/collapse in natural scenarios. Through assessing the applicability of the additive manufacturing technology in mining engineering, this study aimed to further explore its potential applicability in other engineering contexts such as slope controlling, large underground engineering, and underground space stability.

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“…He et al [ 25 , 26 ] proposed a unified rock bolt model, and a numerical method was proposed to provide a detailed profile of the behaviour of bolts, particularly at intermediate loading stages. Chen et al [ 27 , 28 ] studied the anchorage performance of bolt to different joint opening conditions. The results reveal that increasing the shearing strength of the grout/rock contact surface was conductive to improving the anchorage performance of bolts.…”

Section: Introductionmentioning

confidence: 99%

Prediction of bolt supporting the controlling influence angle based on a synthetic weight factor

Liu

Zhang²,

Meng³

et al. 2022

PLoS ONE

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The purpose of a rock bolt is to improve the strength capacity of a jointed rock mass. The strengthened arch controlling area can be formed based on the superposition of the controlling influence range of the bolt with the controlling influence angle of rock bolt playing an important role. However, quantitative research on the influence angle is still rare. In this study, numerical simulations and mathematical analysis are used to study the law of stress field distribution and the controlling influence angle through a single bolt, and the following conclusions can be obtained. (1) The compressive stress field is roughly distributed in an "Apple shape" and in a "conical" spatial distribution. (2) The bolt controlling angle is not a constant 45°, and it is influenced by the rock mass strength and bolt parameters. It decreases with the increasing elastic modulus of the bolt, bolt diameter and bolt length. It also increases with the increasing pretension and rock mass strength. The length has less influence on the supporting range. (3) Based on the experimental results, an optimal analytical model to predict the bolt’s controlling influence angle was developed. The analytical model includes the influences of the rock mass strength and bolt parameters. (4) A comparison between the model predictions with the results from the Dabei Mining 103 face transportation tunnel and the existing results shows the rationale behind the original support design scheme and an improvement over the existing results.

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Investigating the anchorage performance of full-grouted anchor bolts with a modified numerical simulation method

Cited by 37 publications

References 30 publications

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face

Additive manufacturing technology in mining engineering research

Prediction of bolt supporting the controlling influence angle based on a synthetic weight factor

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