武汉长江隧道岩土工程勘察难点及措施

Difficulties and Measures of Geotechnical Engineering Investigation about Yangtze River Tunnel in Wuhan

武汉长江隧道工程是中国"万里长江第一隧",其勘察技术要求高,施工难度大,采用常规勘察方法难以解决水上钻探与测试定位困难,砂土层取芯率低,热物性等特殊岩土参数测试,长江上地下水流速与流向测试困难等难题,为此采用组合锚定位、动态跟踪纠偏技术、江上同位素示踪法地下水流速、流向测试、江上勘探深度监控技术、砂土旋切式钻探工艺等方法圆满解决了遇到的工程难题,为武汉长江隧道工程建设提供了准确的岩土工程勘察资料。

Yangtze river tunnel project in Wuhan is the first tunnel through Yangtze river in China,high technical require-ment for geotechnical engineering investigation is necessary,but its construction is difficult. Conventional survey methods are difficult to solve positioning of water drilling and testing difficulties on Yangtze river,low core recovery percentage of sand,special geotechnical parameters indicators testing such as thermal property,groundwater flow rate and flow on Yan-gtze river testing problems,and so on. therefore by adopting many anchors combination positioning,dynamic tracking cor-rection technology,isotope tracer method testing groundwater flow velocity and direction,exploration depth monitoring technology,rotary cutting type drilling technology of sand satisfactorily solve the geotechnical engineering investigation problems and provide accurate geotechnical engineering data for the wuhan Yangtze river tunnel project construction.