ABSTRACT

As ocean engineering has developed towards the deep sea, a precise instrument is urgently needed to accurately measure the in situ strength of soft clay at the shallow strata of the deep sea and thus to evaluate the bearing capacity of the foundation. In this paper, a new type of probe – the strip probe – is introduced. The soft clay failure modes, including the shallow penetration and deep penetration of the strip probe, were analysed by a centrifugal model test and the mesh-to-mesh solution mapping (MMSM) finite element method. Based on limit analysis, the upper-bound solutions between the soft clay strength and the strip probe penetration resistance were established under non-full-flow and full-flow modes. Through an in site penetration test, the upper-bound solutions were proven rational, and the strip probe was appropriate for detecting the strength of abyssal soft clay.

摘要

随着海洋工程向深海方向发展，迫切需要一种精密仪器来准确测量深海浅层软粘土的原位强度，从而评估地基承载力。本文介绍了一种新型探针——带状探针。通过离心模型试验和网格到网格解映射（MMSM）有限元方法分析了软粘土破坏模式，包括条形探针的浅穿透和深穿透。在极限分析的基础上，建立了非全流和全流模式下软粘土强度与条形探针穿透阻力之间的上限解。通过现场渗透测试，证明了上限解决方案是合理的，