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首页> 外文会议>ASME international conference on ocean, offshore and arctic engineering >LARGE DEFORMATION FE ANALYSES OF CONE PENETRATION IN SINGLE LAYER NON-HOMOGENEOUS AND THREE-LAYER SOFT-STIFF-SOFT CLAYS
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LARGE DEFORMATION FE ANALYSES OF CONE PENETRATION IN SINGLE LAYER NON-HOMOGENEOUS AND THREE-LAYER SOFT-STIFF-SOFT CLAYS

机译：单层非均质和三层软肋-软黏土中圆锥贯入的大变形有限元分析

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摘要

Continuous profiles from in-situ penetrometer tests are now identified as essential for site specific soil investigation as part of designing offshore structures in deep and ultradeep waters and in highly layered seabed conditions. This paper describes the results from large deformation FE (LDFE) analysis undertaken to provide insight into the behavior of cone penetrometer penetrating through single layer non-homogeneous clays and three-layer uniform soft-stiff-soft clays. For the smooth cone penetration in non-homogeneous clays, the soil strength non-homogeneity factor was shown to have insignificant effect on the cone bearing capacity factor. However, for the rough cone, the bearing capacity factor in non-homogeneous clay was about 10～12% lower than that in uniform clay. Bearing capacity factors for smooth and rough cones were also similar for non-homogeneous clay. For cone penetration in stratified soft-stiff-soft clays, a minimum layer thickness of 20 diameters was required to mobilise the full resistance of the stiff layer. The corresponding soil flow mechanisms are also discussed linking directly to the profile of penetration resistance.
机译：现在，作为在深，超深水域和高度分层海床条件下设计海上结构的一部分，现场渗透计测试的连续剖面现已被确定为特定地点土壤调查的必要条件。本文介绍了通过大变形有限元分析（LDFE）得出的结果，以深入了解锥形渗透仪通过单层非均质粘土和三层均质软-硬-软粘土的行为。对于在非均质黏土中顺利渗透圆锥体而言，土壤强度非均质性因子对圆锥体承载力因子影响不显着。然而，对于粗糙圆锥体，非均质黏土的承载力系数要比均质黏土低约10〜12％。对于非均质粘土，光滑和粗糙圆锥体的承载力因子也相似。为了使圆锥体渗入分层的软硬质软粘土中，需要最小厚度为20的直径，以调动硬质层的全部阻力。还讨论了相应的土壤流动机理，直接与渗透阻力的分布联系起来。

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