Anchoring effect and energy-absorbing support mechanism of large deformation bolt

Zhao, Tianfeng; Xing, Minglu; Guo, Wei‐yao; Wang, Cunwen; Wang, Bo

doi:10.1007/s11771-021-4622-0

Cited by 54 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(3) More attention should be paid to the improvement of vault and arch waist when repairing the middle and rear parts of the lining structure [18]. (4) e simulation results of the discrete element method combined with LS-DYNA and FLUENT can more accurately determine the damage degree of the concrete blocks.…”

Section: Discussionmentioning

confidence: 99%

Modeling of Tunnel Concrete Lining under Fire and Explosion Damage

Yang

Wang

Gao

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

This paper presents studies that focus on fire and explosion-induced damage of tunnel structures by employing the Discrete Element Method (DEM). By assuming a two-dimensional aggregate distribution and reconstructing the digital representation of the experimental concrete blocks, a numerical model of the tunnel lining concrete was established in the PFC2D program. The temperature distribution and the shock wave pressure at the surface of the tunnel lining were obtained by using Fluent and LS-Dyna separately; the final damage simulation of concrete section under different conditions was carried out in PFC2D. The results showed that PFC2D cooperatively provided more accurate and effective modeling and visualization of impact damage of concrete blocks. The visualizations of damage indicated the degree of damage more clearly and more intuitively. These findings also provide a potential method for further study of the damage assessment for entire tunnel lining structures.

show abstract

Section: Discussionmentioning

confidence: 99%

Modeling of Tunnel Concrete Lining under Fire and Explosion Damage

Yang

Wang

Gao

2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…Studies have shown that, during the excavation of deep buried tunnels, the stress of surrounding rockmass redistributes and small cracks appear around the tunnel. ese cracks continue to expand and penetrate each other under the action of external forces and eventually cause part of the rockmass to separate from the matrix rockmass, forming an excavation damage zone [1]. Tracking this process is helpful to understand the failure mechanism of hard brittle rockmass, so as to formulate corresponding control measures.…”

Section: Introductionmentioning

confidence: 99%

Techniques for Progressive Failure Simulation of Hard Brittle Surrounding Rockmass: Taking the URL Test Tunnel as an Example

Zhong

Chen

Zhou

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Accurate simulation of the failure process of hard brittle surrounding rockmass is very important for the analysis and control of the structural stability in deep underground engineering. In order to simulate the progressive failure process of the hard brittle surrounding rockmass, a continuous discontinuous deformation analysis method that couples the finite element and discrete element is adopted. Taking the URL test tunnel in Canada as an engineering case, the constitutive model of the contact considering the effects of cohesion weakening and friction strengthening is applied, and the 2D approximation to 3D excavation by applying elastic modulus reduction technology is adopted to simulate the range and depth of crack growth of the surrounding rockmass. Then, the comparison between simulated results and on-site monitoring results is performed, which shows good consistency. At the same time, the key factors in the numerical simulation of progressive failure in hard brittle rockmass are identified, including the number of elements, excavation effects, and constitutive models. The results show that the constitutive model determines the basic form of crack propagation, but in order to accurately simulate the progressive propagation of cracks, the number of elements must be sufficient enough and the effects of 3D excavation must be considered. The analysis accurately simulates the progressive failure characteristics of hard brittle surrounding rockmass under high stress, achieving the purpose of reasonably grasping the degree of damage to the surrounding rockmass, and provides technical reference and support on how to accurately simulate the failure of hard brittle surrounding rockmass using the finite discrete element method.

show abstract

“…At present, coal mining is deeply threatened by rock bursts (Zhao et al 2018a;Zhao et al 2018b;Zhao et al 2021). Generally, rock burst can be divided into four types according to different disaster mechanisms: coal pillar instability, fault slip, fold structure and roof fracture (Pan et al 2003;Lu et al 2018;Yu et al 2018;Hu et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Research on mechanical properties and acoustic emission characteristics of rock beams with different lithologies and thicknesses

Zhao

Zhang

Guo

et al. 2021

Lat. Am. j. solids struct.

Self Cite

View full text Add to dashboard Cite

The lithology and thickness of the rock beam affect its mechanical properties and acoustic emission characteristics when it is fractured. In this study, three-point bending tests of rock beams were carried out. Then, we proposed to utilize the percentage of peak energy to characterize the intensity of energy release during fracture. Finally, the energy release mechanism of coal roof fracture was discussed. The evolution process of acoustic emission includes five stages. The acoustic emission amplitude distribution of rock beams has three typical patterns. Most of the cracks after fracture are tensile cracks, the proportion of tensile cracks is positively correlated with the elastic modulus. The percentage of peak energy is positively correlated with thickness and elastic modulus. More energy is released when thick and hard roof fractures. When necessary, measures such as reducing the thickness or the strength of the roof could be taken to improve the safety of mining.

show abstract

Anchoring effect and energy-absorbing support mechanism of large deformation bolt

Cited by 54 publications

References 23 publications

Modeling of Tunnel Concrete Lining under Fire and Explosion Damage

Modeling of Tunnel Concrete Lining under Fire and Explosion Damage

Techniques for Progressive Failure Simulation of Hard Brittle Surrounding Rockmass: Taking the URL Test Tunnel as an Example

Research on mechanical properties and acoustic emission characteristics of rock beams with different lithologies and thicknesses

Contact Info

Product

Resources

About