Analytical model of the shear behaviors of bolted rough joints based on the dilation effect and surface abrasion

Zheng, Luobin; Wang, Liangqing; Zhu, Linfeng; Fan, Binqiang; Dong, Manman; Sun, Zhenqiu; An, Cailong

doi:10.1016/j.enggeo.2021.106399

Cited by 16 publications

(6 citation statements)

References 44 publications

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“…Similarly, Singh and Spearing (2021) established an analysis model to predict the shear characteristics of the bolt under large deformation, and proposed a method to consider the effect of post-elastic strain hardening on the bending stiffness of bolted rock. Recently, considering the relationship between the dilation effect and the bolt deformation and the influence of joint surface abrasion, Zheng et al (2021) proposed an analytical model for predicting the shear behaviors of bolted rough joints. To estimate the effectiveness of the rock reinforcement system, on the basis of analyticallyderived interface behavior between a rock bolt and the rock material for grouted rock bolts, Nie et al (2014) proposed a rock bolt element by coupling a rock bolt element into the DDA(2D).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A nonlinear rheological shear constitutive model of bolted joints considering initial damage and damage evolution

Zhang

Lin

et al. 2023

International Journal of Damage Mechanics

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Understanding the shear mechanics mechanism of bolted joints is of great significance for predicting and preventing geological disasters. Most current studies seldom consider the rheological effects of bolted joints. In this paper, a comprehensive rheological constitutive model is proposed, accounting for initial damage and damage evolution across different rheological stages and bolt characteristics. The model incorporates an elastoplastic Hooke body for instantaneous deformation, parametric nonlinear Kelvin and viscous models for attenuation and steady creep stages, and a visco-plastic model based on time-dependent shear strength for accelerated creep stage. Additionally, a bolt-rock cooperative deformation model is introduced, considering the evolution of the bolt's elastic modulus. The resulting elasto-viscoplastic constitutive model effectively describes the shear rheological behavior of bolted joints, with its validity and superiority demonstrated through comparisons with shear creep tests and the Maxwell model. This research aims to provide valuable theoretical guidance for the construction and reinforcement of rock mass engineering projects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A nonlinear rheological shear constitutive model of bolted joints considering initial damage and damage evolution

Zhang

Lin

et al. 2023

International Journal of Damage Mechanics

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“…The rock mass is easy to produce large deformation and failure phenomena such as dislocation and separation along the weak structural plane, which is also the decisive factor leading to the failure of the anchoring support system (Li et al 2010a;Ma et al 2019;Zhang et al 2022). Field engineering and laboratory tests show that, the fracture of supporting materials are often manifested as a tensile-shear composite failure mode in which unstable rock mass slips along the structural plane (Li et al 2010b;Li et al 2015;Liu et al 2017;Zheng et al 2021). Therefore, it is of great significance to carry out research on the shear resistance of bolt anchorage for the stability control of geotechnical engineering.…”

Section: Introductionmentioning

confidence: 99%

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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“…Its good reinforcement effect has been unanimously recognized. At present, experts have systematically studied the anchored structural plane through theoretical derivation [17,18], laboratory experiment [19,20], and numerical simulation [21,22], and achieved abundant research results. Through laboratory tests, as the most common means to study the anchored structural plane, many scholars have carried out relevant research around rock strength [23], anchoring method [24], bolt type [25], anchorage angle [26], and joint roughness [27], and revealed the influence law of these factors on the shear mechanical properties of anchored structural plane [28,29].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Lin

Feng

et al. 2022

Materials

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Rock mass, the heterogeneous natural material composed of rock and discontinuities, is an important part of engineering construction. Discontinuities affect the mechanical properties of natural rock mass and further threaten the stability of rock engineering. To study the failure characteristics of anchored structure plane with different JRC, jointed specimens with four different JRC were fabricated by pouring cement mortar. Specimens were tested under four different normal loads to figure out how JRC and anchorage angle affect the mechanical properties of anchored structure plane. Besides, acoustic emission (AE) testing technology was adopted to explore the AE characteristics of anchored structural plane under shearing. The results showed that there exists a positive correlation between the peak shear strength and JRC. The undulation shape of structural plane led to an obvious downward trend in the strain softening stage of the structural plane with JRC of 6–8 and 18–20. When the anchorage angle ranged from 45° to 60°, the potentiation of bolt was the most significant. Based on the AE results, the larger the normal stress, the more likely the cumulative count curves were to enter the fast growth phase before the peak. The characteristics of b-value curves are mainly related to the topography of structural planes and whether the bolt is deformed. In the direct shear test, the cumulative proportion of shear cracks was more than 85%, which is much higher than that of tensile cracks. The variation of cumulative tensile cracks goes through three stages: slow growth, rapid growth, and slow growth. Compared with the unanchored structural plane, the variation range of real-time tensile cracks of the anchored structural plane is large, and sometimes the proportion of real-time tensile cracks may reach 80%.

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Analytical model of the shear behaviors of bolted rough joints based on the dilation effect and surface abrasion

Cited by 16 publications

References 44 publications

A nonlinear rheological shear constitutive model of bolted joints considering initial damage and damage evolution

A nonlinear rheological shear constitutive model of bolted joints considering initial damage and damage evolution

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

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

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