波浪力作用下半圆体结构地基应力分析研究

Analysis of and Study on Ground Stresses of Semi-circular Structure under Wave Actions

长江口深水航道治理二期工程半圆体结构发生不同程度的沉陷,损坏的主要原因是由于在波浪动荷载作用下,地基土强度弱化以至破坏,但对波浪动荷载对软土地基弱化的机理和地基土中动静应力的关系没有充分认识和研究。文章试通过对工程现状和破坏形态的分析,从波浪作用下地基应力分布和动静应力的关系,结合土体动三轴试验,探索波浪动荷载对软土地基弱化的机理和判定结构破坏的标准。

Semi-circular structures of Yangtze Estuary caved in different degrees. The major causes of such damage Deepwater Channel Regulation phase Ⅱ project have were deemed to be the weakening and destruction of soil strength under dynamic wave loads. However, no complete understanding and study have been made to the weakening mechanism of soft soil under dynamic wave loads and the relationship between dynamic and static stresses. Based on the analysis of current situation and destroying patterns of the structure, this paper explores the weakening mechanism of soft soil under dynamic wave loads and criteria judging the structural destruction from the distribution of ground stress and relationship between static and dynamic stresses under wave actions, and in combination with dynamic tri-axial tests of soil.