Numerical study on spalling failure of rock surrounding deep buried tunnel based on DEM

Chen, Long; Jin, Aibing; Wu, Shunchuan; Chu, Chaoqun; Li, Xue

doi:10.1016/j.compgeo.2022.104653

Cited by 32 publications

(9 citation statements)

References 32 publications

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“…Combined with the quantitative correlation between the characteristic parameters of rock microstructure and macroparameters under rainfall and earthquake, the mechanical parameters of discontinuous elements can be defned. Te interaction relationship between discontinuous elements can be determined based on the contact constitutive law, and the boundary conditions of the coupling domain can be determined [35]. Research can be performed on the deformation and failure processes of a high slope with the tunnel structure considering the efects of rainfall and earthquake, and its failure patterns and mechanisms can be determined.…”

Section: Failure Mechanism Analysis Of the High Slope With Tunnelmentioning

confidence: 99%

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Shi

Yuan

Che

et al. 2023

Advances in Civil Engineering

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The instability of high rock slopes with tunnel structures increases under the effects of earthquakes and rainfall. Limited studies have been conducted on the long-term effect analysis of high rock slopes with tunnels. Field electrical measurements on rock slopes have been conducted to study the response of high rock slopes with large cross-section tunnels during rainfall and seismic loading. The material threshold was determined using the resistivity probability density statistical method, and a three-dimensional geological visualization model was obtained. A three-dimensional mesh reconstruction method consisting of material segmentation, cluster filtering, mesh generation, and material attribute mapping modules was proposed. The three-dimensional model of high-cutting rock slope was reconstructed, and the three-dimensional finite element model of the rock slope with tunnel was obtained. The response analysis of the slope was performed during rainfall and seismic loading by employing the El-Centro wave. The results demonstrated that plastic strain was generated in the fracture zone of the upper part of the tunnel during rainfall, and the strain value was 8.135 × 10−4. In the subsequent stages, it had a tendency to expand into the tunnel under continuous rainfall. The maximum principal strain was 3.324 × 10−2 under the effect of a strong earthquake. A large strain was generated in the fracture zone at the upper part of the tunnel. It had a tendency to expand under long-term load, which significantly affected the safety of the tunnel.

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Section: Failure Mechanism Analysis Of the High Slope With Tunnelmentioning

confidence: 99%

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Shi

Yuan

Che

et al. 2023

Advances in Civil Engineering

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“…The calculation of the mechanical effect is mainly performed by numerical simulation based on finite element (Zhao, 2012;Real et al, 2015;Song et al, 2019), discrete element (Xiang et al, 2018;Wu et al, 2020;Chen et al, 2022) or the finite difference method (El Omari et al, 2021;Zaheri et al, 2021;Bai et al, 2022), The distribution of the plastic zone of the surrounding rocks is evaluated against the calculation, but most of the cases are limited to direct comparison, and the reasons for the appearance of the plastic zone and the influence of the plastic zone on the calculation results were not analyzed, which sometimes caused some deviation in the process of evaluating the excavation Frontiers in Environmental Science frontiersin.org scheme only by numerical simulation. Criteria for assessing stratigraphic stability.…”

Section: Analysis Of Stability Criteriamentioning

confidence: 99%

Decision criteria and intelligent decision method for tunnel excavation scheme selection considering carbon emissions

Xia¹,

Mao²,

Chen³

et al. 2022

Front. Environ. Sci.

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The tunnel construction process is accompanied by high resource consumption and non-negligible greenhouse gas emissions. Reducing the carbon emissions from this process is an issue that should be considered in the decision-making stage. For tunnel construction using the drill-and-blast process, selecting a reasonable excavation scheme is a feasible method for reducing carbon emissions. This paper proposes an evaluation index system that takes into account the stability of the tunnel construction process and the reasonable assessment of carbon emission levels. For various scenarios with different focus on stability requirements, theoretical deductions are used to filter out the key indicators that should be used as assessment items. For the determination of carbon emission assessment indicators, this study is guided by the life cycle theory, and in the determined calculation boundary, the reference of previous projects and expert opinions are selected as the item source to fill the unfavorable situation in which the carbon emissions of different excavation schemes cannot be accurately calculated because of the lack of bills of quantities in the engineering decision stage. This paper also proposes an intelligent decision method based on a support vector machine to better complete the task of calculating and ranking the utility of excavation schemes to adapt the proposed multi-factor parallel evaluation system. Finally, the proposed decision indicator system and decision method were applied to the selection of the excavation scheme in an engineering case, and reasonable and realistic scoring results were obtained.

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“…With the maturity of similarity theory and methods in underground engineering, scholars have adopted acoustic emission technology and digital scattering methods for similar materials and similarity simulations. Among them, in terms of materials similar to coal rock, the digital scattering technique has been utilized to study the uniaxial compression deformation of similar materials [1,2], rockburst propensity [3], coplanar bifurcation tensile [4], multimineral main perturbation loading [5], and Brazilian discs with filled and unfilled fissures [6]; the acoustic emission technique has been utilized to study the damage of prefabricated unifurcated sandstones with similar materials, the damage of uniaxial compression deformation [7], different ratios of the event and energy evolution laws of materials [8], true triaxial loading and unloading [9], uniaxial damage evolution [10], and the mechanical properties of combined coal rocks [11]. In terms of similar simulations, digital technology has been used to study the deformation damage of overburdened rock layers [1], surface subsidence [12], the excavation of oversized chamber groups [13], shock wave tunnel damage [14], protective layer mining [15], overburdened three-zone evolution [16], overburdened rock movement at different inclinations of mining [17], fissure evolution [18], the dynamic damage of shock-loaded tunnels [19], and seismic weak-face slope sliding [20]; and acoustic emission technology has been used to study the excavation of oversized section chamber groups [13], rockburst damage [19], and coal seam drilling instability [21].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Material Deformation and Similarity of Spatial Characteristics of Standard Coal Rocks

Liu,

Wang,

Zan

et al. 2024

Processes

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The comparison between similar materials and original coal rock is the basis for similar simulation experiments in coal mines. The differences in mechanical properties, acoustic characteristics, and damage laws between similar materials and the original coal rock are of great significance for similar simulation research, to reveal objective laws. First, materials similar to coal rock with similar theoretical ratios were taken as the object of research, and the sand–cement ratio, the carbon paste ratio, and the water content were determined by multivariate linear regression to accurately match the ratios. Second, by using acoustic emission and digital scattering technology to explore the acoustic law, deformation characteristics, and spatial feature similarities of the materials similar to coal rock, the acoustic emission evolution law of the original rock was found to be the same as that of the similar materials. Digital scattering was able to describe the localization of strain in the similar materials, and the correlation between the overall deformation and the local deformation was explored. This indicates that materials similar to coal rock can effectively simulate the deformation of actual coal rocks. Lastly, these materials were found to allow effectively simulating the deformation characteristics and spatial properties of actual coal rock, which provides an important experimental means and method for similar research in the field of coal rock engineering.

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Numerical study on spalling failure of rock surrounding deep buried tunnel based on DEM

Cited by 32 publications

References 32 publications

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Long-Term Effect Analysis of a High Slope with Tunnel Structure Based on Three-Dimensional Mesh Reconstruction

Decision criteria and intelligent decision method for tunnel excavation scheme selection considering carbon emissions

Feasibility Study of Material Deformation and Similarity of Spatial Characteristics of Standard Coal Rocks

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