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在近海沉积物中广泛存在一种以粉质砂为主的轻亚粘土(中、低塑性少粘土),它常常是近海工程建筑物的主要持力层。本文针对南海北部湾某海区拟建混凝土重力式平台处的这种海洋上,从以下三方面研究了它的基本力学特性:(1)从常规固结不排水试验,看其与典型粘土(塑性较高)在静态剪切下的差别;(2)周期加载下的动力特性,尤其是液化和动力强度特性;(3)经受周期加载后的静态特性(预剪效应),包括不排水静强度改变规律。最后,根据这些试验成果,对这类土的力学性质作了初步的机理分析,试图从本质上解释其特有的力学性质。
A wide range of light sub-clays (medium and low plasticity and less clay) dominated by silt sand are widely found in offshore sediments, which are often the main bearing layers of offshore engineering buildings. In this paper, the basic mechanical properties of the proposed marine concrete gravity platform at a certain sea area in the Beibu Gulf of South China Sea are studied in the following three aspects: (1) From the conventional consolidated undrained test, it is compared with typical clay (plasticity). Higher) Differences under static shear; (2) Dynamic characteristics under cyclic loading, especially liquefaction and dynamic strength characteristics; (3) Static characteristics after undergoing cyclic loading (pre-shearing effects), including static strength without undraining Change the law. Finally, based on these experimental results, a preliminary mechanism analysis was performed on the mechanical properties of this type of soil, trying to explain its unique mechanical properties in essence.