一种新型静力触探系统在滩浅海工程地质勘查中的应用

    APPLICATION OF A NEW CONE PENETRATION TEST SYSTEM IN BEACH AND SHALLOW-SEA ENGINEERING GEOLOGICAL INVESTIGATION

    • 摘要: 滩浅海地区由于其地理环境的特殊性,在工程地质勘查中一直缺乏经济、有效的原位测试手段。本文介绍了一种新型的滩浅海静力触探系统(CPtss),包括设有贯入装置与液压装置的主体设备和设有充气装置、真空发生装置以及系统控制装置的附属设备,其测试方法包括:主体设备由船拖至目标点位靠自重沉入海底,以液压贯入方式测试海床以下土体的强度,获得触探头强度测试参数。利用该系统在黄河水下三角州开展了现场试验测试,得到了海床土的锥尖阻力、侧摩阻力及摩阻比随深度的变化曲线,在此基础上获得海床土的地基承载力特征值,并对该海域的海床成层性特征进行了初步探讨。该系统运行稳定,操作简单,且具有海上连续走航测试的特点,在今后滩浅海工程地质勘查中具有很好的应用前景。

       

      Abstract: Since there is a lack of a cost-effective in-situ measuring approches in the beach and neritic area of special sedimentary envrionment, we developed a new core penetration test system in shallow sea areas(CPtss),devided into the main equipment composed of penetration device and hydraulic device and the auxiliary equipment composed of air filling device, vacuum generator, and system control device. In the testing process, the main equipment, after being draged to the target location by ship, measures sediment strength by hydraulic drive way, and records the strength parameters. The CPtss has been applied to the modern subaqueous Yellow River delta, and the variation of tip resistance, lateral friction, and friction-resistance ratio with depth was obtained, and the bearing capacity of seabed was caculated basing on the obtained sediment strength parameters, and the stratigraphic characteristics was analyzed. The developed CPtss introduced in this paper, with the charateristics of stable and easy operation, and the capacity of continuous navigation test, has a good application prospect in engineering-geology investigation in the beach and shallow sea areas.

       

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