对青岛胶州湾隧道一些工程地质问题的看法及建议

青岛胶州湾隧道海域段水下地质勘察极为困难,工程地质情况众说纷纭。部分人认为,湾口一带因存在湾口断裂、片麻岩、火山构造等地质条件,其岩性和地质构造复杂程度、水文地质条件之差、安全系数之低位居目前世界上现有海底隧道之首,引起了社会和建设者的广泛关注。为此,作者通过陆域段的施工实际及对相关资料分析,对隧道的地质断裂、火山口构造、透水性等地质问题提出了自己的看法,并提出了加强超前地质预报、充分论证和评估存在的地质问题、增设超前支护及预注浆、配备足够的抽排水设施、二次衬砌紧跟等建议。

Some Comments and Proposals about the Engineering Geology of Jiaozhouwan Subsea Tunnel at Qingdao City

Underwater exploration for the geology of Jiaozhouwan subsea tunnel at Qingdao city had been most difficult,about the engineering geology opinions were widely divided.Some people deemed,since at the bay mouth there existed fracture,gneiss and volcanic structure etc.,the tunnel will rank the first among the world sub-sea tunnels in terms of complexity of rock properties and geologic structure,bad hydrogeologic conditions and low factor of safety.This attracted the concern of public and constructors.Authors of the paper considered the con-struction practice of the land section of the tunnel and analyzed relevant engineering data,put forward their own comments about the geological fracture,volcanic structure,permeability and other geologic problems as well as proposals including intensifying advance geologic prediction,identifying and evaluating the existing geologic prob-lems,installation of advance support and performing advance grouting,allocating enough amount of pumping de-vices,in time fabricating secondary lining.