Rock mass collapse mechanism of concealed karst cave beneath deep tunnel

Huang, Fu; Zhao, Lianheng; Ling, Tonghua; Yang, Xiaoli

doi:10.1016/j.ijrmms.2016.11.017

Cited by 73 publications

(20 citation statements)

References 10 publications

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“…is analytical solution was then applied for investigating the effects of rock parameters on the collapse surface of the rock mass where a karst cave exists beneath a tunnel. e analytical solution matched up with numerical solution very well, so as to provide an effective method for collapse risk prediction of karst tunnels [25].…”

Section: Introductionmentioning

confidence: 89%

Characteristics of Karst Cave Development in Urban Karst Area and Its Effect on the Stability of Subway Tunnel Construction

Xue

Cai

Wang

et al. 2021

Advances in Civil Engineering

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The existence of karst caves poses a large threat to safe tunnel construction in a karst area. This paper presents a synthetic method to evaluate the collapse risk before subway tunnel construction with Yang-Jian interval tunnel as a case study. The crosshole seismic Computed Tomography (CT) integrated with Geological Drilling (Geo-D) was first applied to accurately delineate the karst location and its scale. Then, 483 groups of seismic wave CT images were recorded, and 524 karst cave anomalies were found. The height of karst caves in the study area is 1–20 m and mainly concentrated at approximately 5 m. The vertical distance between the karst cave and the tunnel is mainly within 15 m. According to the detection results, a series of numerical models were built and calculated using FLAC3D to investigate the effect of different sizes and locations of karst caves on the displacement and stability of the surrounding rock in tunnels. Afterwards, based on the simulation results, the disturbance degree evaluation index was established to quantitatively evaluate the risk level of karst caves. The evaluation results indicate that the buried depth of the karst cave greatly affects the disturbance degree. No treatment is required for the deeply buried karst cave that is more than 7 m from the tunnel. When the distance between the cave and the tunnel is less than 7 m, there is a critical size of the cave. Karst caves that are larger than that critical value must be filled with a single slurry or binary slurry before tunnel construction to eliminate the risk of tunnel collapse. This study can be used to provide a more efficient and economical program for metro tunnel construction above a karst cave.

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Section: Introductionmentioning

confidence: 89%

Characteristics of Karst Cave Development in Urban Karst Area and Its Effect on the Stability of Subway Tunnel Construction

Xue

Cai

Wang

et al. 2021

Advances in Civil Engineering

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“…W o = (w 1o , w 2o , w 3o , w 4o , w 5o , w 6o ) = (0.298, 0.197, 0.088, 0.155, 0.200,0.104) (2) Analytic hierarchy process (AHP). The AHP method is a subjective weighting method that can integrate the knowledge and experience of experts, and the intension and preference of decisionmakers.…”

Section: Combination Weighting Methodsmentioning

confidence: 99%

Dynamic Risk Assessment Method of Tunnel Collapse Based on Attribute Interval Assessment Model and Application

Wang¹,

Li²,

Cheng³

et al. 2020

Pol. J. Environ. Stud.

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“…If a karst cave is present beneath a deep highway tunnel, there is a risk of collapse of the tunnel floor. In view of this problem, Huang et al [18] derived an analytical expression of the collapse surface of the rock mass under the tunnel floor by using the variational principle and upper bound theorem. Based on this analytical solution, the range of the collapse region was obtained, and the validation of the analytical solution was proved by comparing it with the numerical simulation solution.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Collapse Region Induced by a Concealed Karst Cave above a Deep Highway Tunnel

Huang

Wang

Feng

et al. 2020

Advances in Civil Engineering

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The presence of a concealed karst cave above a deep highway tunnel may cause the collapse of the rock mass between the karst cave and tunnel during excavation. Rock mass collapse threatens the safety of tunnel construction personnel. A prediction method of the collapse region induced by a concealed karst cave above a deep highway tunnel is proposed on the basis of the upper bound theorem of limit analysis. An analytical expression of the collapse surface is derived from the variational principle. Using the analytical expression of the collapse surface, the shapes of the collapse surfaces are plotted for different rock mass parameters. Moreover, the minimum safe distance between the karst cave and tunnel is defined, and the computational equation of the minimum safe distance is derived. The proposed method is applied in a highway tunnel excavated in a karst terrain as a case study. Based on geological survey report parameters, the shape of the collapse surface and the minimum safe distance between the karst cave and tunnel are obtained. Finally, the collapse surface of the rock mass provided by the proposed approach is compared with that provided by numerical simulation, and the favorable result comparison shows that the proposed method is valid.

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Rock mass collapse mechanism of concealed karst cave beneath deep tunnel

Cited by 73 publications

References 10 publications

Characteristics of Karst Cave Development in Urban Karst Area and Its Effect on the Stability of Subway Tunnel Construction

Characteristics of Karst Cave Development in Urban Karst Area and Its Effect on the Stability of Subway Tunnel Construction

Dynamic Risk Assessment Method of Tunnel Collapse Based on Attribute Interval Assessment Model and Application

Prediction of the Collapse Region Induced by a Concealed Karst Cave above a Deep Highway Tunnel

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