动单剪试验在海洋岩土工程中的应用

Application of Dynamic Simple Shear Test in Marine Geotechnical Engineering

海洋工程建设中,风、浪、流以及地震作用,使海上构筑物受到长期动荷载作用或短期极端动荷载作用。这些动荷载最终将传递到构筑物的基础以及周边地基土中,需要地基土体具备一定的动态安全储备。所以土动力特性的研究对构筑物在位性能分析尤为重要,过去通常用动三轴试验进行研究。本文对动单剪试验进行研究,分析了动三轴与动单剪的区别,展开论述了海底滑坡、吸力锚、砂土液化等方面的应用理论,并研究了土的各向异性特征。动单剪仪通过设定不同加载,能够达到与实际土体受力相吻合的力学状况,其所得力学参数的可信度较高,应在海洋岩土工程中广泛应用推广。

In the construction of Marine engineering,wind,wave,flow and earthquake make offshore structures subject to long-term dynamic load or short-term extreme dynamic load.These dynamic loads will eventually be transferred to the foundation of the structure and the surrounding foundation soil.Therefore,the study of soil dynamic characteristics is particularly important for the structure in situ performance analysis.This paper studies the dynamic single shear test,analyzes the difference between the dynamic three axes and the dynamic single shear,discusses the theory of submarine landslide,suction anchor,sand liquefaction,and studies the anisotropy of soil.The dynamic single shear instrument can achieve the mechanical condition consistent with the actual soil force by setting different loads,and its mechanical parameters have high reliability,which should be widely used in Marine geotechnical engineering.