A numerical simulation approach of energy-absorbing anchor bolts for rock engineering

Li, Weiteng; Li, Xiuming; Mei, Yuchun; Wang, Gang; Yang, Wendong; Wang, Hongtao

doi:10.1016/j.ijrmms.2022.105188

Cited by 13 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These techniques are also gradually being applied to solve engineering geological problems. The mutual verification between the results of numerical simulation calculations, experimental findings, and engineering practice has expanded the scope of problem solving in engineering geology, deepened the exploration of research topics, and effectively advanced the quantitative advancement of the engineering geological discipline [24][25][26]. Therefore, during the mining process of deep, thick, and hard roof working faces, this research employs FLAC3D V4.0 numerical simulation software to simulate and examine the dynamic evolution process of the stress field, displacement field, energy field, and plastic zone of the coal seam and overlaying strata.…”

Section: Introductionmentioning

confidence: 96%

Study on the Spatiotemporal Dynamic Evolution Law of a Deep Thick Hard Roof and Coal Seam

Zhang,

Dai,

Sun

et al. 2023

Processes

View full text Add to dashboard Cite

Underground mining in coal mines causes strong disturbance to geological structures and releases a large amount of elastic strain energy. When the roof is a hard and thick rock layer, it is easy to cause dynamic disasters such as rock burst. To analyze the impact of a deep thick and hard roof fracture on the safe mining of thick coal seams, this paper studied the dynamic evolution process of the stress field, displacement field, energy field, and plastic zone of the coal seam and overlying strata during the mining process using FLAC3D numerical simulation. The results show that as the working face continues to be mined, the concentrated stress in the overlying strata first increases and then decreases, and the support pressure in front of the working face continues to increase. When it advances to 100 m, collapse occurs, and the stress increases sharply; the bottom plate undergoes plastic failure, resulting in floor heave. The overlying strata mass in the top plate exhibits downward vertical displacement, while the rock mass in the bottom plate exhibits upward vertical displacement, with a maximum subsidence of 4.51 m; energy concentration areas are generated around the working face roadway, forming an inverted “U” shape. When collapse occurs, the energy density decreases slightly; the direction of the plastic zone changes from “saddle shaped” to complete failure of the upper rock layer, and the overlying strata is mainly shear failure, which expands with the increase in mining distance. The research results have important practical significance for guiding the safe mining of deep thick and hard roof working faces.

show abstract

Section: Introductionmentioning

confidence: 96%

Study on the Spatiotemporal Dynamic Evolution Law of a Deep Thick Hard Roof and Coal Seam

Zhang,

Dai,

Sun

et al. 2023

Processes

View full text Add to dashboard Cite

show abstract

“…Yan proposed an anchor cable-Tesla support system that can effectively control roof deformation and breakage, further demonstrating the effectiveness of anchor-cable-based support systems for thick soft rock mass roofs [17]. Li developed a mechanical model for energy-absorbing bolts that better models the yield support effect of energy-absorbing bolt cables in soft rock mass roofs [18]. Kong utilized UDEC to simulate the movement behavior of a soft and thick roof in the goaf of a fully mechanized caving face, concluding that the immediate roof forms an "arch" structure while the main roof fracture develops a "three-hinged arches" structure [19].…”

Section: Introductionmentioning

confidence: 98%

Full Anchor Cable Support Mechanism and Application of Roadway with Thick Soft Rock Mass Immediate Roof

2023

View full text Add to dashboard Cite

The focus of this paper is the thick soft rock mass roof of the track roadway in the No. 3606 panel of the Chaili Coal Mine. Due to its substantial thickness, the soft rock mass roof of the roadway is susceptible to damage and deformation during the mining process. In order to preserve the integrity of the roadway roof, a full anchor cable support scheme is proposed after studying the mechanism of bolt-anchor cable support. The supporting parameters and feasibility of the scheme were determined through support experience and numerical simulation analyses in the field. Moreover, on-site monitoring and data analysis were conducted, revealing that the anchor cables and anchor bolts played a stable role in supporting the roadway. The displacement of the roadway’s roof and floor was minimal, as was the displacement of the two ribs. The overall deformation of the roadway was minor. Practice demonstrated that the full anchor cable support method was effective in supporting the immediate roof of thick soft rock.

show abstract

“…Some new support components and ideas for the yieldable support of soft-rock tunnels were also introduced for roadways (Öge, 2021). However, the improvement measures did not break away from traditional thinking and mainly involved strengthening support (Figure 1A), e.g., grouting, high-strength bolts, energy-absorbing cables, arch frames, combined support, and narrowing spacing (Li et al, 2022a). This means a higher cost and longer construction period, but it still fails to change the current situation of soft-rock roadway deformation and failure.…”

Section: Introductionmentioning

confidence: 99%

Stability mechanisms of soft rock mining roadways through roof cutting and pressure relief: an exploratory model experiment

Zhu,

Li,

Lou

et al. 2023

Front. Ecol. Evol.

View full text Add to dashboard Cite

IntroductionSoft rock mining roadways are severely deformed and damaged during coal mining. Blindly increasing the support strength not only has little effect but also wastes material resources.MethodsMaintaining the original support parameters, model experiments were conducted to investigate the mechanism of pressure relief protection of the front soft rock mining roadway by cutting the roof behind the longwall face. The roof-cutting height was 2.5 times the coal thickness, the angle was 10°, and the advance distance is 0. ResultsThe study found that the abutment stress borne by the roof of the original roadway was transferred to the coal seams to be mined. The average stress of the coal seams increased by 10%, while the average stress of the surrounding rock in the front roadway decreased by 12.57%. The roof cutting weakened the influence of the overlying strata in the gob on the rear roadway. The stability of the rear roadway also weakened the traction effect on the front roadway. The vertical convergence of the front roadway decreased by 27.3%, and the deformation of the coal pillars decreased by 15.7%.DiscussionThe roof cutting reduced the stress of the front roadway to the peak failure stress, fundamentally weakening the main factor that induced the deformation of the front roadway. Numerical simulations were performed to research the deformation and stress distribution properties of the surrounding rock after roof cutting, and the model experimental results were validated. Finally, engineering recommendations are presented, which are expected to provide a reference for controlling the roadway stability of soft rock masses.

show abstract

A numerical simulation approach of energy-absorbing anchor bolts for rock engineering

Cited by 13 publications

References 12 publications

Study on the Spatiotemporal Dynamic Evolution Law of a Deep Thick Hard Roof and Coal Seam

Study on the Spatiotemporal Dynamic Evolution Law of a Deep Thick Hard Roof and Coal Seam

Full Anchor Cable Support Mechanism and Application of Roadway with Thick Soft Rock Mass Immediate Roof

Stability mechanisms of soft rock mining roadways through roof cutting and pressure relief: an exploratory model experiment

Contact Info

Product

Resources

About