静止土压力系数变化对砂土中板桩码头结构受力变形特性的影响机理分析

我国海洋强国战略的不断推进对码头结构的设计和建造提出了更精细化的要求。本文以单锚板桩码头结构为例，首先利用砂雨法制备了不同堆积状态的均质砂土地基，并通过离心模型试验，测定了该地基的静止土压力系数；然后基于有限元数值模拟，研究了不同静止土压力系数下，港池开挖完成后单锚板桩码头结构前墙水平位移、弯矩和土压力分布等问题；最后通过离散元数值仿真，深入分析了颗粒的静止土压力系数变化对墙体作用压力影响的细观机理。研究结果表明：地基土静止土压力系数增加会提高港池开挖完成后板桩码头结构前墙的受力和变形水平，其增大后对港池开挖后前墙两侧的土压力影响较大，堆积体中深层颗粒间的骨架力链数量增多，力的传导效率更高，作用在深部墙体上的土压力变化趋势差距较大。细化静止土压力系数取值可有效提高结构设计水平，对保障结构安全具有重要意义。

英文摘要:

The continuous promotion of China爷s maritime power strategy has put forward more refined requirements for the design and construction of dock structures. This article takes the single anchor sheet pile wharf structure as an example. Firstly, homogeneous sandy soil foundations with different stacking states were prepared using the sand pourer method, and the coefficient of earth pressure at rest of the foundation was determined through centrifugal model tests. Then, based on finite element numerical simulation, the horizontal displacement, bending moment, and soil pressure distribution of the front wall of the single anchor sheet pile wharf structure after excavation of the harbor basin were studied under different static soil pressure coefficients. Finally, through discrete element numerical simulation, the microscopic mechanism of the influence of the variation of the coefficient of earth pressure at rest of particles on the wall was analyzed in depth. The research results showed that an increase in the coefficient of earth pressure at rest of the foundation soil would improve the stress and deformation level of the front wall of the sheet pile wharf structure after the excavation of the harbor basin. After the increase of the coefficient of earth pressure at rest, it had a significant impact on the soil pressure on both sides of the front wall after the excavation of the harbor basin. The number of skeleton force chains between deep particles in the accumulation body increased, and the transmission efficiency of force was higher. The trend of soil pressure changed acting on the deep wall varied greatly. Refining the value of the coefficient of earth pressure at rest can effectively improve the level of structural design and is of great significance for ensuring structural safety.

查看全文查看/发表评论下载PDF阅读器