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中文摘要：
为了研究富水断层等复杂地质条件对海底隧道围岩的影响,以青岛胶州湾海底隧道为工程背景,采用三维有限差分软件FLAC3D建立三维数值模型对海底隧道不同地质条件下的耦合响应进行计算分析,同时选取典型地段,利用现场实测数据和数值计算结果进行相互验证。分析结果表明,断层对海底隧道围岩的影响相对较小,而水的影响则要大的多,尤其是在断层与地下水耦合的情况下,有可能导致隧道洞周失稳。地下水的存在会极大地影响隧道的稳定,而当围岩条件又较差时,掌子面及开挖未及时支护段极易失稳破坏。在富水断层破碎带中,相对于隧道的衬砌安全和洞周的稳定,掌子面更容易失稳,掌子面的稳定是控制隧道稳定的关键因素。
英文摘要：
In order to analyze the effect of the water-rich fault of complicated geological conditions on the surrounding rock of the subsea tunnel（ taking the subsea tunnel that locates in Qingdao Jiaozhou Bay for an example）,numerical simulation for the coupling response in different geological conditions of subsea tunnel was made by three-dimension finite difference software FLAC3D,and the calculation results were mutually verified with the experimental data measured in typical engineering area. The analysis results indicate that the effect of the water on the surrainding rock of the subsea tunnel is much higher than the fault,especially in the conditions that the fault couples with the ground water,which could lead to instability of the surrounding rock. The existence of the ground water greatly affects the stability of subsea tunnel and it is prone to cause unstable failure in the tunnel face and not timely supported segment when the conditions of the surrounding rock are poor. In water-rich zone of fault fracture,the tunnel face is easier to suffer instability than that of the lining and surrounding rock around the tunnel. The stability of tunnel face is the key factor to control the stability of the tunnel.
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