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Research on the Engineering Construction Geological Condition of Qingdao Jiaozhou Bay Tunnel |
| China Railway First Survey and Design Institute Group Co. Ltd, Xi′an, Shanxi 710043, China |
| (China Railway First Survey and Design Institute Group Co. Ltd, |
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Abstract 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.
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