Influence of temperature and roughness of surrounding rocks on mechanical behavior of rock bolts

Li, Fuhai; Jin, Hesong; Hu, Dinghan; Wang, Bo; Jia, Yating

doi:10.1016/j.soildyn.2017.09.011

Cited by 14 publications

(2 citation statements)

References 4 publications

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“…e results showed that temperature has little influence on the pull-out failure with cement grout as a binder. With the increase of country rock roughness, the pull-out strength of the anchor body increases, and the bolt support effect is enhanced [15]. Su et al studied the pyrolysis characteristics and pore structure evolution of resin anchoring materials at high temperature using micro CT scanning and threedimensional image reconstruction technology.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures

Liu

Yao

Xue

et al. 2021

Advances in Civil Engineering

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In order to study the anchoring instability mechanism of surrounding rock in deep roadway, the failure mechanism of the bolt-anchoring agent interface was studied by simulating different strength rock mass and ground temperature environment, using C20, C40, and C60 strength concrete and steel pipe to simulate different surrounding rock strength environments. Indoor pull-out tests were carried out to study the pull-out load displacement relationship, ultimate pull-out force, residual anchoring force, the distribution law of axial stress and tangential stress along the bar, and the energy consumption value of drawing failure at 20, 50, and 70°C. The test results show that, with the decrease of surrounding rock strength or the increase of ambient temperature, the pull-out force, residual anchoring force, and energy consumption value of anchorage interface gradually decrease; under different axial forces, the axial force distribution of the rod body decreases exponentially from the anchoring end to the opposite end; and the shear stress transfers to the deep part of the anchor body with the increase of the load. According to the failure phenomenon of the specimen, the failure modes of the bolt bolt-anchorage agent interface can be divided into shear slip mode and shear expansion slip mode. The shear expansion slip formula of anchorage interface is derived. Using high-strength and temperature-resistant resin anchoring agent for comparative test, the rationality of the mechanism analysis is proved, which provides more clear guidance for the construction of anchor support.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures

Liu

Yao

Xue

et al. 2021

Advances in Civil Engineering

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show abstract

“…The creation and propagation of microcracks were promoted with cooling conditions [26,27]. Li et al [28] investigated the mechanical characteristics influenced by the temperature of surrounding rocks and found that the ultimate tensile force, which is dependent on temperature, obeyed a cubic polynomial function. The effect of temperature on the breakage energy, yield force, breakage force, and elasticity modulus of individual particles was also investigated [29].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Influence of Temperature and Confining Pressure on the Hydraulic Conductivity of the Integrated and Fractured Jurassic Conglomerates

2021

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This paper presents an experimental investigation on the properties of hydraulic conductivity and permeability of conglomerates under different temperatures and confining pressures with integrated samples and samples with shear failure. Constant head tests were carried out in a temperature-controlled triaxial cell with samples obtained from the Zhuxianzhuang Coal Mine. Five levels of temperatures (10°C, 20°C, 28°C, 35°C, and 50°C) and three levels of confining pressures (3 MPa, 5 MPa, and 7 MPa) were chosen for the tests. The results show that there is a negative relationship between hydraulic conductivity and confining pressure with both original and shear failure samples. An inflection point of 35°C is found in the relationship between the flow rate and temperature. However, with increasing temperature conditions, hydraulic conductivity first increases and then decreases at 50°C with the intact sample, while hydraulic conductivity first decreases from 20°C and then increases with the shear failure sample. Finally, nonlinear regression equations of hydraulic conductivity and temperature were obtained under different confining pressures.

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Research Review on Water Inrush Mechanism and Failure Criterion of Rock Mass in Deep Mines

Yan,

Qi,

Hou

et al. 2023

Geotech Geol Eng

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Influence of temperature and roughness of surrounding rocks on mechanical behavior of rock bolts

Cited by 14 publications

References 4 publications

Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures

Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures

Investigation on the Influence of Temperature and Confining Pressure on the Hydraulic Conductivity of the Integrated and Fractured Jurassic Conglomerates

Research Review on Water Inrush Mechanism and Failure Criterion of Rock Mass in Deep Mines

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