摘要：研究目的：针对青岛胶州湾海底隧道跨度大，施工难度大，洞身地质条件复杂，施工影响因素不确定，风险亦大的特点，研究、分析洞身断层、涌水、围岩分级变更等对施工的影响，为保障施工安全提供科学依据。

研究结论：（1）胶州湾海底隧道洞身构造和裂隙水分布，受不确定因素的影响存在差异；（2）研究、分析了洞身断层的具体位置和特征，找出了存在差异的原因：将断层所用的方位角误以为是走向方位角，造成了走向、倾向背离区域构造的异常现象；（3）通过对围岩变更数据的研究，绘制出围岩分级变更比例示意图，直观反映了施工前后围岩等级划分的变化：原Ⅲ级围岩所占的比例由53%变更调整为29%、Ⅳ级围岩的比例由28%变更调整为58%、Ⅴ级围岩的比例由10%变更调整为4%；（4）该研究成果可应用于隧道施工期间开展工程地质工作，实施动态设计，保障工程的质量、工期、安全和控制投资规模。


Abstract：Research purposes： With regard to the characteristics of Qingdao Jiaozhou bay tunnel construction, such as large-span cross-section, great difficulty in construction, complex geological conditions, uncertainty of the construction influencing factors, high risk,this paper researches and analyzes the impact of fault, water bursting, surrounding rock classification change on construction, to ensure the security of construction and provide scientific basis.
Research conclusions：(1) Jiaozhou bay tunnel structure and fissure water distribution can be different affected by uncertain factors. (2) Found out the reasons of possible differences by research and analysis of specific location and characteristics of tunnel fault: mistaking fault azimuth angle for strike azimuth angel which leads to anomalies of strike and propensity distortion in regional structure. (3) Based on the research of change data of surrounding rock, map the proportion change in surrounding rock classification diagram, to intuitively reflect the variation trend of surrounding rock classification before and after the construction: the proportion of Grade Ⅲ surrounding rock has been changed from 53% to 29%, the proportion of Grade Ⅳ surrounding rock has been changed from 28% to 58%, the proportion of Grade Ⅴ surrounding rock has been changed from 10% to 4%. (4) The research can be applied in carrying out the engineering geological fieldwork, implementing dynamic design and guaranteeing the quality, time limit, safety and project investment control during tunnel construction.
