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Large scale three-dimensional seepage analysis model test and numerical simulation research on undersea tunnel

机译：海底隧道大型三维渗流分析模型试验与数值模拟研究

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During the construction process of Qingdao Jiaozhou Bay Undersea Tunnel, the faults and other unfavorable geological discontinuities were often encountered. To study the water inrush mechanism in the faults, both physical model test and numerical analysis were carried out. The results of crown displacement and hydraulic pressure of the monitoring sections in the physical model and numerical model were analyzed in this paper. It was found that the displacement and hydraulic pressure in the process of tunnel construction are often interacted as both cause and effect, and the lower of hydraulic pressure is often accompanied with the growth of its displacement. The changing of the excavation disturbed zone during the excavation in the undersea tunnel was also studied. The results show that the excavation disturbed zone in fault is larger than that in surrounding rock mass, and the excavation disturbance effects in the filling type fault are both transient and persistent. When the displacement and hydraulic pressure in the undersea tunnel change sharply during excavation, there are relatively slow and continuous change trend of the displacement and hydraulic pressure. For practical purposes, to prevent water inrush in the undersea tunnel, more attentions should also be paid to the undersea tunnel after excavation. (C) 2016 Elsevier Ltd. All rights reserved.
机译：青岛胶州湾海底隧道施工过程中经常遇到断层等不利的地质不连续性。为了研究断层中的突水机理，进行了物理模型试验和数值分析。分析了物理模型和数值模型中各监测段的拱顶位移和水压结果。研究发现，隧道施工过程中的位移和水压经常是因果关系相互影响的，而较低的水压往往伴随着位移的增加。还研究了海底隧道开挖过程中开挖扰动带的变化。结果表明，断层中的开挖扰动区大于围岩中的开挖扰动区，充填型断层中的开挖扰动效应既是瞬时的又是持续的。在开挖过程中，当海底隧道的位移和水力急剧变化时，位移和水力的变化趋势相对缓慢且连续。出于实际目的，为防止海底隧道涌水，开挖后还应更加注意海底隧道。 （C）2016 Elsevier Ltd.保留所有权利。

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