Long-term deformation and control structure of rheological tunnels based on numerical simulation and on-site monitoring

Mu, Wenqiang; Li, Lianchong; Chen, Daozhi; Wang, Sixu; Xiao, Fukun

doi:10.1016/j.engfailanal.2020.104928

Cited by 39 publications

(11 citation statements)

References 42 publications

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“…More broadly, rocks damage can also be expressed using the energy dissipation concept. Referring to Yang et al [55], the global damage equation of rocks using the energy dissipation concept is as follows:…”

Section: Damage and Failurementioning

confidence: 99%

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Frenelus

Peng

Zhang

2021

Frattura Ed Integrità Strutturale

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Rocks are frequently host materials for underground structures, particularly for deep Tunnels. Their behavior plays a fundamental role in the overall stability of these structures. In fact, the erection of deep tunnels imposes rocks excavations around the defined routes. These excavations are generally carried out by various methods of which the most used are Drill-and-Blast (DB) and Tunnel Boring Machine (TBM). However, regardless of the tunnelling method used, the impacts such as the perturbation of the initial stress field in rocks and the release of the stored energy are always significant. The impacts produce damage, fractures and deformations which are generally time-dependent and influence the long-term stability of deep tunnels built in rocks. Thus, by considering the aforementioned excavation methods, this paper identifies, reviews and describes the relevant factors generated during and after rock excavations. Interestingly, such factors directly or indirectly influence the long-term stability and therefore the structural integrity of deep rock tunnels. In addition, some recommendations and proposals for future works are presented. This paper can provide useful references in understanding the degradations, damage and fractures generated by tunnelling methods and facilitate suitable actions to ensure long-term stability of deep underground structures.

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Section: Damage and Failurementioning

confidence: 99%

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Frenelus

Peng

Zhang

2021

Frattura Ed Integrità Strutturale

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“…At the same time, considering the mutual influence between adjacent working faces, the stress at multiple inclined crack tips with certain spacing is the product of the stress at a single inclined crack tip and the correction coefficient, as shown in Equation (10) [43]. Therefore, bringing in Equations ( 6) and (7), the following formula is obtained:…”

Section: Stress Function Of Mode I and Mode Ii Crack Tip Affected By ...mentioning

confidence: 99%

“…In recent years, the frequency of rockbursts in mining underground and space engineering has increased significantly. The factors influencing rockburst are complex, mainly including the excavation mode, surrounding rock stress state, rock mass structure, and its performance [7][8][9][10][11]. Scholars have deeply studied the incubation process, occurrence mechanism, and prevention technology of rockburst and have discussed the rockburst characteristics of rock masses in different environments [12,13].…”

Section: Introductionmentioning

confidence: 99%

Physical Simulation Test on Surrounding Rock Deformation of Roof Rockburst in Continuous Tunneling Roadway

Shi

et al. 2021

Minerals

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To study the occurrence process, as well as the temporal and spatial evolution laws, of rockburst disasters, the roof deformation of continuous heading roadways during rockburst was studied through a physical similarity simulation test with a high similarity ratio and low strength. The deformation and failure evolution law of the roadway roof in the process of rockburst were analyzed by using detection systems, including a strain acquisition system and a high-power digital micro-imaging system. The results show that the rockburst of the roadway roof can be divided into four stages: equilibrium, debris ejection, stable failure, and complete failure stage. According to the stress state of a I–II composite crack, the theoretical buckling failure strength of the surrounding rock is determined as 1.43 times the tensile strength. The flexural failure strength of a vanadium-bearing shale is 1.29–1.76 times its compressive strength. With continuous advancement in the mining time, the internal expansion energy of the roadway roof-surrounding rock in the equilibrium stage continuously accumulates. The fracture network continuously increases, developing to the stable failure stage, with bending deformation, accompanied by continuous particle ejection until the cumulative stress in the failure stage increases, and the tensile state of the rock surrounding the roof expands radially into deep rock. A microscopic damage study in similar material demonstrated that the deformation of the roadway roof is non-uniform and uncoordinated. In the four stages, the storage deformation of the rock surrounding the roadway roof changes from small accumulation to continuous deformation, to the left (or deep rock). Finally, the roadway roof-surrounding rock becomes completely tensioned. The research results presented in this study provide a reference for the prediction and control of rockburst in practical engineering.

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“…The interaction of a tunnel's surrounding rock supports has been a focus of research globally [1][2][3]. The tunnel support structure is complex and difficult to predict, especially for initial support, for which loads originate directly from the surrounding rock that is closely attached to it [4,5].…”

Section: Introductionmentioning

confidence: 99%

Research on the Stress Characteristics of Initial Tunnel Supports Based on Active Load Adjustment

Chen

Fang

2022

Applied Sciences

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Initial tunnel support takes on a critical significance in the stability control of surrounding rocks and the core content of tunnel support design. Its stability and safety are essential to the tunnel. The support load was optimized using the active surrounding rock load intervention scheme in accordance with the section form and bearing characteristics of the support structure. The optimization scheme of active surrounding rock load was obtained by applying active intervention load to the initial support of the tunnel to minimize the peak moment of the support structure. An active adjustment system for tunnel-surrounding rock loads was developed using the function of hydraulic load transfer and transmission combined with load proportion control. Based on the actual project, the implementation effect of the surrounding rock load active intervention scheme was verified by analyzing the measurement results of the supporting structure in the test section and the comparison section. The results suggest that the application of active intervention load can effectively improve the stress state of the tunnel initial support structure, significantly reduce the tunnel surrounding rock bias pressure and the structural peak bending moment, and increase the stability of the support structure. To control the peak moment of the supporting structure, an active intervention method and its implementation scheme for the stress of the tunnel supporting structure were proposed, which reduces the deficiency in which the conventional supporting structure can only passively bear the deformation pressure of the surrounding rock, effectively improves the stress state of the supporting structure, and can provide a reference for the development of novel tunnel supporting forms.

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Long-term deformation and control structure of rheological tunnels based on numerical simulation and on-site monitoring

Cited by 39 publications

References 42 publications

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Long-term degradation, damage and fracture in deep rock tunnels: A review on the effect of excavation methods

Physical Simulation Test on Surrounding Rock Deformation of Roof Rockburst in Continuous Tunneling Roadway

Research on the Stress Characteristics of Initial Tunnel Supports Based on Active Load Adjustment

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