港珠澳大桥岛隧工程精细化勘察组织与实施

Organization and implementation of refined soil investigation in island-tunnel project of HZMB

港珠澳大桥岛隧工程,勘察过程中建立组织机构使设计与勘察紧密结合,国内设计单位会同国外有经验设计咨询公司对勘察进行管理,确保勘察工作满足设计需求;勘察过程全面执行国际标准,采用具有国际先进水平大型勘察设备(如海上液压升降钻探平台、具有波浪补偿功能的钻探设备及海床式CPTU设备),按国际标准进行勘察作业及试验,尽量减少对原状样的扰动;结合设计所需参数按照国际标准开展有针对性试验,对勘察结果采用三维地质模型进行数据处理;勘察成果优于常规勘察并已在岛隧工程实施中得到检验。总结本次勘察的组织与实施经验,希望为今后国内大型项目的地质勘察提供参考,有助于推动我国精细化地质勘察的推广。

The organization program of soil investigation which is different from domestic conventional project of marine bridge and tunnel have been adopted in island-tunnel project of HZMB. The geotechnical investigation organization was set up to connect design during investigation. Domestic and tbreign design and consulting companies supervised and directed the soil investigation together to make sure that the investigation results were satisfied by designer. International standards were followed, large-scale geotechnical equipments of advanced level were used （such as offshore hydraulic driven jackup, separate hydraulic driven drilling rig, seabed CPTU rig）, undisturbed samples have been minimized the disturbance, targeted laboratory tests combining the designing requirements were carried out under international levels, the three-dimensional geological model have been adopted to process geotechnical data. Based on the above fact, the geotechnical results of island-tunnel soil investigation are better than the conventional soil investigation and approved during construction. After the summary of the organization and implementation of refined soil investigation and comparison with conventional investigation, it is recommended that our experiences of refined soil investigation can be used in domestic large-scale project in the future, also it is useful to promote the refined soil investigation to wildly develop in our country.