Upper bound analysis of progressive failure mechanism of tunnel roofs in partly weathered stratified Hoek–Brown rock masses

Qin, Changbing; Yang, Xiaoli; Pan, Qiujing; Wang, L.L.; Miao, Tianyu

doi:10.1016/j.ijrmms.2014.10.002

Cited by 32 publications

(19 citation statements)

References 16 publications

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“…In order to further determine the collapse area of the soil masses above the shallow tunnel, it is necessary to determine n + 1 unknown parameters l 1 − l n+1 , but equation (26) contains only n equations. To solve this problem, we used the upper bound theorem to make the internal energy dissipation rate equal to the external force power; that is, the total energy loss ξ generated in the mechanism in Figure 2 is equal to zero.…”

Section: Determination Of Ree-dimensional Collapse Modementioning

confidence: 99%

“…According to this, the fracture width l 1 − l n+1 of the collapsed soil masses can be obtained by simultaneously solving equations (26) and (27). en, the roof collapse area of the shallow soil tunnel in layered strata can be determined.…”

Section: Determination Of Ree-dimensional Collapse Modementioning

confidence: 99%

“…Other factors like the pore water pressure and ground overload also have a direct impact on tunnel failure and stability. Yang et al [23][24][25] as well as Qin et al [26][27][28][29] once incorporated the nonhomogeneous and stratified characteristics of the strata into their analysis of the roof collapse, which may provide a good theoretical basis for this paper; however, their research is only applicable to deep tunnels.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three‐Dimensional Upper Bound Limit Analysis on the Collapse of Shallow Soil Tunnels considering Roof Stratification and Pore Water Pressure

Wang

Liu

Liu³

et al. 2019

Mathematical Problems in Engineering

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Based on the plastic upper bound theorem, a three-dimensional kinematically admissible velocity field is constructed for the collapse of the soil masses above a shallow tunnel. In this field, this paper considers the influences of the roof stratification, pore water pressure, ground overload, and support pressure. This study deduced the upper bound solutions of the weight of the collapsed soil masses and the corresponding collapse surfaces by utilizing the nonlinear failure criterion, associated flow rule, and variation principle. Furthermore, we verified the validity of the proposed method in this paper by comparing this research with the existing work and numerical simulation results. This study obtains the influence laws of varying parameters on the area and weight of the collapsed soil masses. The results reveal that the area and weight of the collapsed soil masses increase with increasing support pressure and soil cohesion, but decrease with increasing thickness of the upper soil layer, nonlinear coefficient, pore water pressure, and ground overload. Among them, the roof stratification, pore water pressure, soil cohesion, and nonlinear coefficient have a significant influence on tunnel collapse, which should be given special consideration in engineering design.

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Section: Determination Of Ree-dimensional Collapse Modementioning

confidence: 99%

Section: Determination Of Ree-dimensional Collapse Modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three‐Dimensional Upper Bound Limit Analysis on the Collapse of Shallow Soil Tunnels considering Roof Stratification and Pore Water Pressure

Wang

Liu

Liu³

et al. 2019

Mathematical Problems in Engineering

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show abstract

“…Therefore, great importance has been attached to the study of the deformation, stress and stability of the deep high-stress roadway. Numerous methods have been adopted to investigate the failure process and stability mechanism of roadway surrounding rock, including theoretical analysis (Cohen et al 2009, Tang and Kung 2009, Qin et al 2015, numerical simulation, similar material test and field test (Read 2004, Shen et al 2008, Yu et al 2016.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Roof Presplitting and Rock Mass Filling Approach on Controlling Large Deformations and Coal Bumps in Deep High-Stress Roadways

2019

Lat. Am. j. solids struct.

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Roadway deformation and coal bumps are major challenges for underground engineering. Taking the Lu'an mining district in Shanxi Province as an example, the failure mechanism of deep high-stress roadway was studied. Numerical simulations and the similar material test were performed to investigate the effect of the roof presplitting and rock mass filling on the stability of roadway surrounding rock. The change laws and distribution features of stress and plastic zone, and the fracture characteristics of roof strata were analyzed. Under conditions where the roof was not presplit, the roadway was in a high-stress environment due to the massive suspended roof. The failure process of the high-stress roadway began with tensile crack in the shallow roof and then extended to the two ribs, resulting in the yield of a coal pillar. Under the condition that the roof was presplit, the peak value of the vertical stress at the coal pillar was decreased from 18.2 to 9.8 MPa while that of the virgin coal rib was decreased from 15.8 to 13.5 MPa. Both the similar material test and numerical results showed that the Roof outside the Coal Pillar (RCP) was cut off along the presplitting lines and was fractured into different sizes of masses. The broken rock mass filled in the goaf and supported on the overlying strata, which reduced the load on the coal pillar. The field monitoring data indicated that implementing the roof presplitting and rock mass filling processes successfully controlled large deformations of the roadway and coal bumps, which improved the stability of surrounding rock.

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“…As a result, more and more attention has been paid to tunnel collapse, particularly for deep-buried tunnels. In order to better understand tunnel collapse, much research has been done on estimating the instability of tunnel roofs and heading faces, using several approaches, including numerical simulation, experimental methods, and analytical approaches [9][10][11]. However, it is difficult to investigate tunnel collapse experimentally, since recent measurement techniques are limited by the multiscale complexity of the system.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Collapse Scope of Deep-Buried Tunnels Using Pressure Arch Theory

Wang

Jing

Zhang

et al. 2016

Mathematical Problems in Engineering

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Tunnel collapse remains a serious problem in practice. Effective prediction methods on tunnel collapse are necessary for tunnel engineering. In this study, systematic study on the pressure arch was presented to predict tunnel collapse. Multiple factors under different conditions were considered. First, the pressure arch was described as a certain scope in comparison with the lowest pressure arch line. Then, a deep-buried circular tunnel was selected as the investigated object. Its collapse scope was analyzed using the lowest pressure arch line. Meanwhile, the main influence from the ground stress field was considered. Different modes of ground stress fields were investigated in detail. The results indicate that the collapse scope varies with different ground stress fields. Determination on the collapse scope is strongly affected by the judgment standard of the pressure arch. Furthermore, a selected case was analyzed with the pressure arch. The area and the height of tunnel collapse were calculated with multiple factors, including ground stress field, judgment standard, and lateral pressure coefficient. Finally, selected results were compared with relevant previous researches, and reasonable results were obtained. The present results are helpful for further understanding of the tunnel collapse and could provide suitable guidance for tunnel projects.

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Upper bound analysis of progressive failure mechanism of tunnel roofs in partly weathered stratified Hoek–Brown rock masses

Cited by 32 publications

References 16 publications

Three‐Dimensional Upper Bound Limit Analysis on the Collapse of Shallow Soil Tunnels considering Roof Stratification and Pore Water Pressure

Three‐Dimensional Upper Bound Limit Analysis on the Collapse of Shallow Soil Tunnels considering Roof Stratification and Pore Water Pressure

Investigation of the Roof Presplitting and Rock Mass Filling Approach on Controlling Large Deformations and Coal Bumps in Deep High-Stress Roadways

Prediction of Collapse Scope of Deep-Buried Tunnels Using Pressure Arch Theory

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