Experimental study on influence of host rock strength on shear performance of Micro-NPR steel bolted rock joints

He, Manchao; Ren, Shu-lin; Guo, Longji; Lin, Wei-jun; Zhang, Tengwu; Tao, Zhigang

doi:10.1016/j.ijrmms.2022.105236

Cited by 26 publications

(11 citation statements)

References 26 publications

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“…The yield strength range is 600-1050 MPa, the elongation range is 30%-68%, and the negative Poisson's ratio effect of the material itself is realized (Gu et al 2021;Tang et al 2021). The anchorage shear test of 2G-NPR bolt also reflects its excellent characteristics in resisting shear deformation and improving shear strength (He et al 2022;. The study of 2G-NPR micromechanical mechanism and molecular scale has also achieved some research results, but these mainly belong to the category of materials science and will not be discussed here (Jia et al 2023).…”

Section: Introductionmentioning

confidence: 93%

“…The shear mechanics experiment of bolt anchorage granite jointed rock mass was first carried out by Bjurstrom (Bjurstrom 1974), the results show that the anchorage angle has a significant effect on the shear performance of bolt. In recent years, relevant researchers have carried out a large number of experimental studies on the influence of joint surface roughness (Wu et al 2018;Chen et al 2018;Zheng et al 2021), anchorage angle (Jalalifar et al 2010;Lin et al 2014;Li et al 2019), surrounding rock strength (He et al 2022;Chen 2014), bolt type (He et al 2023;Zhang et al 2022;Wu et al 2019a;Li et al 2016;Chen et al 2015;Grasselli et al 2005) and other parameters (Wu et al 2019b;Cui et al 2020) on the shear performance of anchorage, including the macroscopic deformation and failure characteristics, shear strength and shear deformation resistance of bolted rock joints. However, laboratory tests are often complicated to operate and microscopic phenomena cannot be monitored.…”

Section: Introductionmentioning

confidence: 99%

“…The 2G-NPR bolt (the 2nd generation Negative Poisson's Ratio bolt) is a new type of supporting material developed independently (He et al 2021(He et al , 2022. The new bolt has no necking during the static tensile process, and has excellent characteristics of uniform large deformation, disappearance of yield platform and high strength.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation study on shear resistance of anchorage joints considering tensile–shear fracture criterion of 2G-NPR bolt

Ren,

Tao,

et al. 2023

Int J Coal Sci Technol

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Abstract2G-NPR bolt (the 2nd generation Negative Poisson’s Ratio bolt) is a new type of bolt with high strength, high toughness and no yield platform. It has significant effects on improving the shear strength of jointed rock mass and controlling the stability of surrounding rock. To achieve an accurate simulation of bolted joint shear tests, we have studied a numerical simulation method that takes into account the 2G-NPR bolt's tensile–shear fracture criterion. Firstly, the indoor experimental study on the tensile–shear mechanical properties of 2G-NPR bolt is carried out to explore its mechanical properties under different tensile–shear angles, and the fracture criterion of 2G-NPR bolt considering the tensile–shear angle is established. Then, a three-dimensional numerical simulation method considering the tensile–shear mechanical constitutive and fracture criterion of 2G-NPR bolt, the elastoplastic mechanical behavior of surrounding rock and the damage and deterioration of grouting body is proposed. The feasibility and accuracy of the method are verified by comparing with the indoor shear test results of 2G-NPR bolt anchorage joints. Finally, based on the numerical simulation results, the deformation and stress of the bolt, the distribution of the plastic zone of the rock mass, the stress distribution and the damage of the grouting body are analyzed in detail. The research results can provide a good reference value for the practical engineering application and shear mechanical performance analysis of 2G-NPR bolt.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation study on shear resistance of anchorage joints considering tensile–shear fracture criterion of 2G-NPR bolt

Ren,

Tao,

et al. 2023

Int J Coal Sci Technol

Self Cite

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show abstract

“…However, with increasingly complex engineering conditions, the failure of bolted support induced by rock joint shear slip becomes increasingly prominent. Under the combined load of tensile and shear, the bolt is more likely to lose the controllability of surrounding rock deformation and even lead to the failure of the whole supporting system and induce a large deformation disaster of surrounding rock [ 11 , 12 ]. Therefore, it is very important to study the shear characteristics of bolted rock joints for the stability evaluation and control of rock mass engineering.…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand, many studies have shown that rock strength has a significant impact on the shear characteristics of the bolted rock joint. For example, He et al [ 11 ] conducted the bolted rock joint shear test of three rock strengths and found that the shear breaking displacement and shear energy absorption of the bolt decreased with the increase in the strength of the surrounding rock. Yang et al [ 20 ] studied the influence of rock bolts in rock joints with surrounding rock strength and found that increasing the compressive strength of surrounding rock can reduce the axial force of rock bolts with the growth rate of shear.…”

Section: Introductionmentioning

confidence: 99%

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

Jiang

Liu

et al. 2023

Materials

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Anisotropic discontinuity exists widely in rock masses of mines, tunnels, slopes, water conservancy and hydropower projects. The shear characteristics of bolted anisotropic rock joints are extremely important for the stability design of engineering rock mass. However, few scholars have studied the bolted anisotropic rock joint. The different rock properties on both sides of the rock joint, especially the different rock strengths, will greatly affect the deformation characteristics and failure mode of the rock mass. Based on this, a series of shear tests were carried out on the bolted anisotropic rock joint under different normal stresses, and the characteristics of shear stress–shear displacement curve, shear strength, failure characteristics of the rock joint and deformation characteristics of the bolt are discussed. λ is defined as the strength ratio of upper and lower rock on the structural surface. The results show that the effect of λ on the shear stress–shear displacement curve is not obvious at the pre-fracture stage. The shear stress–shear displacement curve at the pre-breaking stage of the bolt presents a softening stage when the normal stress is equal to 0.5 MPa, tends to be horizontal when the normal stress is equal to 1 MPa and presents a hardening stage when the normal stress is greater than 1 MPa. After the bolt is broken, the shear stress–shear displacement curve presents a stepped-down descent. With the increase in λ, the breaking shear stress of the bolt increases. Elliptic failure occurs on the surface of the bolted anisotropic rock joint, and the length of the major axis of the ellipse decreases with the increase in λ value and normal stress. The bolts with different λ values of anisotropic rock joint show “Z-shaped” tensile bending deformation characteristics after shear fracture, and the horizontal and vertical components of the bolt deformation decrease with the increase in λ value and normal stress. The fracture shear displacement of the bolt increases with the increase in normal stress and decreases with the increase in λ value. The research results are helpful to further understand the shear mechanical characteristics and differences of bolted rock joints and provide a reference for solving the engineering problems of the composite layered rock mass.

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A comprehensive review of experimental studies on shear behavior of bolted rock joints with varying rock joint and bolt parameters and normal stress

Zhou,

Lang,

Huang

et al. 2024

Deep Underground Science and Engineering

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The shear characteristics of bolted rock joints are crucial for the stability of tunneling and mining, particularly in deep underground engineering, where rock bolt materials are exposed to high stress, water pressure, and engineering disturbance. However, due to the complex interaction between bolted rock joints and various geological contexts, many challenges and unsolved problems arise. Therefore, more investigation is needed to understand the shear performance of bolted joints in the field of deep underground engineering. This study presents a comprehensive review of research findings on the responses of bolted joints subjected to shearing under different conditions. As is revealed, the average shear strength of bolted rock joints increases linearly with the normal stress and increases with the compressive strength of rock until it reaches a stable value. The joint roughness coefficient (JRC) affects the contact area, friction force, shear strength, bending angle, and axial force of bolted rock joints. A mathematical function is proposed to model the relationship between JRC, normal load, and shear strength. The normal stress level also influences the deformation model, load‐carrying capacity, and energy absorption ratio of bolts within bolted rock joints, and can be effectively characterized by a two‐phase exponential equation. Additionally, the angle of the bolts affects the ratio of tensile and shear strength of the bolts, as well as the mechanical behavior of both bolted rock joints and surrounding rock, which favors smaller angles. This comprehensive review of experimental data on the shear behavior of bolted rock joints offers valuable theoretical insights for the development of advanced shear devices and further pertinent investigations.

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Experimental study on influence of host rock strength on shear performance of Micro-NPR steel bolted rock joints

Cited by 26 publications

References 26 publications

Numerical simulation study on shear resistance of anchorage joints considering tensile–shear fracture criterion of 2G-NPR bolt

Numerical simulation study on shear resistance of anchorage joints considering tensile–shear fracture criterion of 2G-NPR bolt

Study on Shear Behavior and Failure Characteristics of Bolted Anisotropic Rock Joints

A comprehensive review of experimental studies on shear behavior of bolted rock joints with varying rock joint and bolt parameters and normal stress

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