ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2021, Vol. 41 ›› Issue (S1): 256-.DOI: 10.3973/j.issn.2096-4498.2021.S1.032
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WANG Jun, CUI Jiangyu, CHEN Zelong, LI Qian, GUO Zhibo
Online:
Published:
Abstract:
To prevent tunnel in waterrich fault zone from water and mud inrush disaster, the critical safety thickness of tunnel should be determined. A model considering the mechanics and seepage parameters of surrounding rock, tunnel and fault zone parameters is established using the methods of numerical simulation and engineering verification. The multilevel numerical tests of various factors in standard working conditions are performed to analyze the influence of various factors on the critical safety thickness. Multivariate linear regression analysis is used to establish a multifactor prediction formula, and the formula is verified through six engineering examples. The research results show the following. (1) The surrounding rock parameters of waterrich fault zone such as Poisson′s ratio, permeability coefficient, and void ratio and the Poisson′s ratio of ordinary surrounding rock have little inference on the critical safe thickness. (2) The factors such as water pressure, buried depth, thickness of fault zone, tunnel diameter, elastic modulus of the surrounding rock of the fault zone, and ordinary surrounding rock parameters (elastic modulus and void ratio) are positively related to the critical safety thickness of water inrush, whereas the strike and dip of the fault zone, ordinary surrounding rock parameters (severity, internal friction angle, cohesion, and porosity ratio), and the surrounding rock parameters of the fault zone (severity, internal friction angle, and cohesion) are negatively related to the critical safety thickness. (3) The calculation results of prediction formula are more consistent with the results of numerical simulation and the actual project, indicating its effectiveness and guidance value to the project.
Key words: tunnel engineering, waterrich fault zone, water and mud inrush, critical safety thickness, prediction formula
CLC Number:
U 45
WANG Jun, CUI Jiangyu, CHEN Zelong, LI Qian, GUO Zhibo. Prediction Formula of Critical Safety Thickness of Tunnel Water Inrush in Waterrich Fault Zone[J]. Tunnel Construction, 2021, 41(S1): 256-.
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URL: http://www.suidaojs.com/EN/10.3973/j.issn.2096-4498.2021.S1.032
http://www.suidaojs.com/EN/Y2021/V41/IS1/256
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