Effect of bolt inclination angle on shear behavior of bolted joints under CNL and CNS conditions

Cui, Guojian; Zhang, Chuanqing; Chen, Jianlin; Yang, Fanjie; Zhou, Hui; Lu, Jingjing

doi:10.1007/s11771-020-4342-x

Cited by 30 publications

(5 citation statements)

References 36 publications

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“…They concluded that the peak shear strength of bolted rock joint under CNS condition was higher than those under CNL condition. This conclusion is consistent with that observed by Cui et al (2020), who compared the influence of bolt inclination on the shear performance of the jointed rock mass under CNS and CNL conditions and further pointed out that the damage of the shear surface was more severe under CNS condition than that under CNL condition. Furthermore, Jiang et al (2021) investigated the influence of normal stiffness on the shear performance of bolted artificial rough joints, and argued that the normal stiffness has no obvious effect on the first peak strength, but has great effect on the post peak stage of the bolted jointed samples.…”

Section: Introductionsupporting

confidence: 92%

Reinforcement Performance of the Bolted Rock Mass with a Weak Interlayer Under Constant Lateral Stiffness Boundary Condition

Ding

Jiang

Jing

et al. 2023

Preprint

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The widespread existence of weak interlayer poses a serious threat to the stability of roadway surrounding rock under constant stiffness restraint boundary condition in lateral direction (axial direction of roadway) and the rock bolt is widely used to reinforce the surrounding rock of roadway. So, in this paper, the reinforcement performance of the bolted rock mass with a weak interlayer was investigated under constant lateral stiffness (CLS) boundary condition. The research results indicated that the peak strength and elasticity modulus of the samples exponentially increase with the increasing of bolt pretension force and density. Two parameters Rp and RE were put forward to quantitatively describe the reinforcement effect of bolt pretension force and density on the peak strength and elasticity modulus of the samples. Under CLS boundary condition, the lateral direction of the samples experienced loading-unloading and expansion - compaction deformation periods during the whole triaxial compression process. The mechanism for the transformation of expansion - to - compaction was explained. Two new failure modes of the samples were observed and analyzed in detail, and were found them different from those of the bolted jointed rock mass and bedded rock mass.

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Section: Introductionsupporting

confidence: 92%

Reinforcement Performance of the Bolted Rock Mass with a Weak Interlayer Under Constant Lateral Stiffness Boundary Condition

Ding

Jiang

Jing

et al. 2023

Preprint

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show abstract

“…Høien A. et al 25 and An et al 26 studied the failure characteristics of the anchorage system under different pulling conditions by doing different types of bolt pulling tests, and clarified the different types of failure mechanisms under different loading conditions. Zhang et al 27 and Cui et al 28 studied the influencing factors of interface shear ability in the anchorage system, studied the bolt-grout interface, and measured its behavior. They also investigated the influence of bolt angle and boundary conditions on shear behavior and failure characteristics of bolt joints.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Resin Anchoring with Reaming Bottom and Filling in Soft Rock

et al. 2023

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This paper deals with the problem of the slippage failure of bolts in supporting soft rock, and the anchoring system being pulled out when conventional anchoring methods are used for bolts. This situation seriously threatens the safety of personnel and efficiency of work at the supporting soft rock. The main goal of this paper is to develop methods that will take full advantage of the potentially great supporting force that can be provided by bolts installed in soft rock. The study discusses the resin anchoring technique with reaming bottom and filling and proposes that replacing soft rock with high strength hard rock is an effective method to improve the anchoring force that prevents slip failure. The results of a comparative analysis of the different maximum diameters of reaming and the anchorage performance of the method using laboratory testing, numerical simulation, mechanics analysis, and field test are described. The results show that when the reaming diameter is less than five times that of the borehole, the anchorage force increases significantly. When the reaming diameter is more than five times that of the borehole, the increasing degree of anchoring force decreases obviously and the trend is gentle. The anchoring force of five times resin anchoring with reaming bottom and filling is 2.8 times that of conventional anchorage. The resin anchoring technique with reaming bottom and filling guarantees that bolts installed in soft rock will provide high supporting forces.

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“…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%

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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Effect of bolt inclination angle on shear behavior of bolted joints under CNL and CNS conditions

Cited by 30 publications

References 36 publications

Reinforcement Performance of the Bolted Rock Mass with a Weak Interlayer Under Constant Lateral Stiffness Boundary Condition

Reinforcement Performance of the Bolted Rock Mass with a Weak Interlayer Under Constant Lateral Stiffness Boundary Condition

Experimental Study on Resin Anchoring with Reaming Bottom and Filling in Soft Rock

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

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