The Dangerous Condition of Ground during High Overburden Tunneling (A Case Study in Iran)

Bagherpour, Raheb; Rahimdel, Mohammad Javad

doi:10.3311/ppci.7923

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…(ii) e analysis is a full-face excavation analysis; thus the influence of staged excavation as commonly employed in New Austrian Tunneling Method (NATM) is not considered. (iii) e primary support of the tunnel is concrete lining, represented by the elastic plate elements in this study, whereas many support systems by shotcrete lining are required in the numerical analysis for the estimation of squeezing and rockburst potential in water conveyance tunnel [23]. (iv) e horizontal boundary is taken to be the maxima of five times the tunnel diameter or two times the depth of the tunnel center and the vertical boundary is extended from the ground surface to 2.5 times the tunnel diameter below the tunnel center.…”

Section: Assumptions In Numericalmentioning

confidence: 99%

Influence of Tunneling in Cohesionless Soil for Different Tunnel Geometry and Volume Loss under Greenfield Condition

Kanagaraju¹,

Premalatha

2020

Advances in Civil Engineering

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This paper presents the numerical analysis of settlement to profile the vulnerable zone or influence zone due to tunneling activities in cohesionless deposits for free field or Greenfield conditions. The analysis considers the factors like saturated density (γsat), unsaturated density (γunsat), angle of shearing resistance (φ), deformation modulus (ES), volume loss (VL), and the support pressure of the shield head at the tunnel face. The obtained results using a finite element program (FEM) PLAXIS 3D are compared with measured and predicted surface settlement using field measuring instruments, and analytical and empirical solution show a reasonable agreement and are found to be conservative. From literature, for Greenfield condition the ground settlement equal to 10 mm is taken as the minimum value to map the influencing zone considering the fact that the structure which lies beyond this zone would undergo negligible settlement. Settlement trough and 10 mm settlement contour characteristics are presented for different tunnel sizes placed at the same depth and the same tunnel size placed at different depths, respectively. Various influencing zones are arrived for the sandy grounds of different denseness based on the parametrical studies involving parameters such as tunnel size “D,” tunnel axis depth “z,” and volume loss “VL.”

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Section: Assumptions In Numericalmentioning

confidence: 99%

Influence of Tunneling in Cohesionless Soil for Different Tunnel Geometry and Volume Loss under Greenfield Condition

Kanagaraju¹,

Premalatha

2020

Advances in Civil Engineering

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“…Ömer Aydan [5] studied time-dependency in rock mechanics and rock engineering cover the spectrum including coupled processes of thermal, hydrological and diffusions in rocks. Raheb Bagherpour, et al [6] hold that Squeezing and rock burst stands for large time dependent convergence during tunnel excavation. Zhang Lijie [7] studied the impact of time-lagged fracture on marble and limestone rocks under high-stress conditions through laboratory and numerical experiments.…”

Section: Introductionmentioning

confidence: 99%

Study on the Time-lag Failure of Sandstone With Different Degrees of Unloading Damage

Qiao

Luo

et al. 2019

Period. Polytech. Civil Eng.

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The unloading effect of rock mass excavation is an inevitable practice, and it’s often characterized by a relatively large-scale engineering hazard with a noticeable time lag.A set of unloading triaxial tests were conducted on a sandstone rock to establish the deformation law and the threshold time. Based on the renormalization group theory, the unloading sandstone model was developed by considering the interaction between particles. Similarly, a logistic model was used to predict the unloading damage of sandstone. The unloading time lag damage of sandstone rock was predicted by using the damage threshold. The research shows that: (1) The higher the degree of unloading, the shorter the time-lag failure. (2) The damage range of critical values was optimized. (3) The error between the predicted value and the experimental value of the time threshold was almost less than 5 %, the prediction result was found to be good, and the employed logistic evolution model was reasonable. The findings of this research provide a prediction method and precise information about the mechanism of unloading time lag deformation. Therefore, it can be used as a reference for excavation-support design of underground structures.

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Prediction of Squeezing Potential in Tunneling Projects Using Data Mining-Based Techniques

Ghasemi

Gholizadeh

2018

Geotech Geol Eng

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The Dangerous Condition of Ground during High Overburden Tunneling (A Case Study in Iran)

Cited by 3 publications

References 20 publications

Influence of Tunneling in Cohesionless Soil for Different Tunnel Geometry and Volume Loss under Greenfield Condition

Influence of Tunneling in Cohesionless Soil for Different Tunnel Geometry and Volume Loss under Greenfield Condition

Study on the Time-lag Failure of Sandstone With Different Degrees of Unloading Damage

Prediction of Squeezing Potential in Tunneling Projects Using Data Mining-Based Techniques

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