Calculation of the safety thickness of water inrush with tunnel axis orthogonal to fault

Fu, Helin; An, Pengtao; Cheng, Guowen; Li, Jie; Huang, Zhen; Yu, Xiaohui

doi:10.1007/s12517-021-07297-8

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…In addition, the relevant parameters of Dechang Tunnel are, respectively, substituted into the formula (10) in this paper, Meng et al [16] formula, Fu et al [17] formula, and the formula for calculating the safe thickness of karst cave outburst prevention proposed by Xu et al [32] for specific formula expressions). And the relative errors of different calculation formulas are calculated based on the numerical simulation results.…”

Section: Calculation Of Safety Thicknessmentioning

confidence: 99%

“…Based on this, Zhang [15] applied Janssen's theory to the stability analysis of tunnel face in water-rich fault fracture zone for the first time, and the formula for calculating the safety factor of the tunnel face is derived; subsequently, Meng et al [16] also applied this theory to study the safety thickness of tunnel outburst prevention in the fault fracture zone, derived the expression of the safety thickness of outburst prevention, and analyzed the influence of the width of the fault fracture zone on the safety thickness. On the basis of Meng et al [16] and Fu et al [17] combined with the Sheorey model, determined the stress state of surrounding rock when water and mud inrush occurred, and based on the limit equilibrium method, the expression of the safe thickness of outburst prevention was deduced, and the parameter sensitivity analysis was carried out too.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Safety Thickness of Tunnel Outburst Prevention in Water-Rich Fault Fracture Zone Based on Janssen’s Theory

Zhong

Zhou

2022

Geofluids

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In the construction of tunnel in water-rich fault fracture zone, when the thickness of outburst prevention is insufficient, it is very easy to cause water and mud inrush engineering accident. Therefore, it is very necessary to study the safety thickness of outburst prevention for this type of tunnel. In this paper, the expression of in situ stress in water-rich fault fracture zone is derived based on Janssen’s theory. Two mechanical models of outburst prevention rock mass are established, and according to the shear balance theory, the calculation formula for the safe thickness of outburst prevention is determined and the parameter sensitivity analysis is carried out. Finally, it is verified by engineering examples and numerical simulation. The results show that: (1) the calculation formula of outburst prevention thickness proposed in this paper is more perfect and shows good prediction effect for deep- and shallow-buried tunnels; (2) the greater the angle α between tunnel axis and fault zone and the dip θ of fault fracture zone, the smaller the critical safety thickness of outburst prevention and the safer it is for tunnel construction; (3) when the fault fracture zone inclines inward relative to the tunnel face, the gravity of the rock mass in the fault zone will lead to an increase in the safety thickness of outburst prevention, and reinforcement measures should be taken during actual construction.

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Section: Calculation Of Safety Thicknessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%