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| Evolution law of water inrush disaster in fault tunnel under rainfall condition |
| WANG Mitian1, WANG Yingchao1,2*, WANG Nan1, FENG Shuai1, LI Wenhao1, YANG Jiajie1
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1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;
2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China |
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Abstract The evolution process of water and mud inrush disaster in fault tunnel under the effect of rainfall was discussed under the self-developed multifunctional tunnel model test device. Based on the momentum equation of porous media with apparent velocity, the pressure loss in porous media area was simulated. The influence laws on rainfall intensity, fault dip angle, fault orientation and surrounding rock classification for water and mud inrush was also analyzed. The results showed that the greater the rainfall intensity was, the stronger the softening effect of rainfall on the surrounding rock and the greater the damage to the surrounding rock of fault tunnel was; under the same rainfall intensity, the greater the dip angle of the fault was, the greater the damage to the tunnel health was; under the same rainfall intensity, when the fault passes through the tunnel, the stability of tunnel surrounding rock could not be guaranteed; under the same rainfall intensity, the greater the permeability coefficient was, the more unstable the surrounding rock and the higher incidences of water inrush and collapse disasters was. Moreover,the experimental results were in correspondence with the numerical simulation results. The research provides some insights and references for deepening the understanding of water and mud inrush in fault tunnel and proposing effective control measures.
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Received: 26 July 2021
Published: 20 December 2021
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