Mechanical behavior of rock bolts under a high temperature environment

Wang, Bo; Guo, Xinxin; Li, Fuhai; Hu, Dinghan; Jia, Yating

doi:10.1016/j.ijrmms.2018.01.026

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…To analyze the influence of the bolt-anchored body on bearing characteristics of SR more reasonably, several scholars adopted the finite element method (FEM) to study the stability of bolt-anchored SR, which took into account the bolt material and mechanical parameters [14][15][16], anchoring angle, and tunnel section shape [17][18][19]. Lyu et al [20] took the roof of a rectangular coal roadway as an example and simulated the supporting effect of the roof SR for various bolt layouts.…”

Section: Related Studiesmentioning

confidence: 99%

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Shi

et al. 2021

Advances in Civil Engineering

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The support strength of surrounding rock in deep mining roadways can be significantly improved by replacing the end bolt anchorage with a full one. The support effects of both types of anchorage and the axial stress distribution characteristics in anchored bolt bodies were assessed via the indoor pull-out test, simulated via the FLAC3D software, and verified by field measurements. The stability and variation patterns of the axial force, as well as the evolution law of bearing characteristics of surrounding rock, were analyzed. The results indicate that the polymorphic deformations of deep mining roadway surrounding rock and the bolt support body interact synchronously. The axial force evolution trend in bolt bodies with end anchorage revealed by field tests was consistent with the laboratory test results, in contrast to that of full anchorage. Although stress distribution laws in both sides of the mining roadway were the same for both types of anchorage, the vertical stress peak and damage range of full-anchored surrounding rock slightly exceeded those of the end-anchored one. The anchored area bearing a higher load alleviated the stress concentration of the surrounding rock. Since the deformations in fully and end anchored surrounding rocks increased gradually and sharply, respectively, the full anchorage is more conducive to deformation moving control of deep mining roadway surrounding rock. The research results can provide theoretical guidance for the design and construction of deep mining roadway bolt support.

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Section: Related Studiesmentioning

confidence: 99%

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Shi

et al. 2021

Advances in Civil Engineering

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“…Reinforcement provided by rock bolt is the promotion of the natural self-supporting ability within the host rock mass. Mechanical properties of rock bolt and bolt failures caused by rock mass have been studied extensively in many ways, including laboratory and field tests [1][2][3][4][5][6][7][8][9][10], numerical simulations [11][12][13][14][15][16][17], and analytical method [18][19][20][21][22][23]. And, some scholars study its mechanical properties by analyzing its dynamic response recently [24][25][26][27].…”

Section: Prefacementioning

confidence: 99%

Study of Shear Capacity of Jointed Rock Mass with Prestressed Anchor Bolt

Zhao

Hong-tao

Nie

2019

Advances in Civil Engineering

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Rock mass failure caused by jointed plane is the common disaster in geotechnical engineering. Research on shearing property of jointed rock mass with prestressed anchor bolt and its mechanical property is an aspect for the stability analysis of rock slope and tunnel. This paper studies the stress and deformation of bolt and jointed plane, as well as anchored body and rock mass during shearing by indoor model testing and theoretical analysis. The shearing strength and mechanical property of anchored jointed plane have been systematically studied, and the additional force caused by deformation of prestressed anchor bolt and jointed rock mass during the shearing has been proposed and verified. The anchorage interaction between rock mass and bolt is revealed.

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“…Aghchai et al [8] proposed an analysis method to determine the shear strength parameters of the bond by using the load displacement curve of the bolt head based on the bolt pull-out test. Wang et al [9] found that the bolt temperature has a certain impact on its pull-out strength. At 25 °C-35 °C, the pull-out strength increases with the increase of temperature, and at 50 °C-70 °C, the pull-out strength decreases.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Borehole Water Content on Bolt Anchoring Force in Soft Surrounding Rock

Zhang

Lin

Liu

et al. 2022

Shock and Vibration

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In order to further reveal the influence mechanism of borehole water content on anchoring force in soft surrounding rock, three different research methods are used. Firstly, through theoretical analysis, it reveals that borehole water content will affect the cohesion of anchoring agent and then leads to the decrease of anchoring force. Secondly, through experimental analysis and numerical simulation of the influence of different boreholes water content on the anchoring force, it indicates that the borehole water content has a weakening effect on the mechanics characteristics of bolts significantly. When the borehole water content is less than 15 mL, the influence of borehole water content on anchoring force is weak for a given borehole length. When the borehole water content is greater than 15 mL, the anchoring force decreases greatly with the increase of borehole water content for a given borehole length and the decline of anchorage force is more than 30%. At the same time, through the experimental analysis, it reveals that the failure type of bolt in weak surrounding rock is the typical failure of anchorage force where the fracture goes far into the surrounding rock. Thus, in practical operation, reasonably controlling the borehole water content (rate) within the critical value can improve the bolt support effect and reduce the support cost.

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Mechanical behavior of rock bolts under a high temperature environment

Cited by 11 publications

References 2 publications

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Bearing Characteristics of Surrounding Rock of Deep Mining Roadway with Full and End Bolt Anchorages: A Comparative Numerical and Experimental Study

Study of Shear Capacity of Jointed Rock Mass with Prestressed Anchor Bolt

Study on the Influence of Borehole Water Content on Bolt Anchoring Force in Soft Surrounding Rock

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