悬臂式围护桩受力性状与内力传递特征试验

Experiment of the Force Behavior and Internal Force Transfer Properties of Cantilever Fender

为研究悬臂式围护桩结构的内力、弯矩、位移和嵌固段的变化规律及特点,结合西宁火车站综合改造工程,对该深基坑支护结构在不同开挖工况条件下悬臂桩的受力性状与内力传递特征进行现场动态测试试验。试验结果表明:悬臂桩的受力特征与理论值有所差异,在实际设计中可对其在配筋方式、混凝土强度设计、嵌固段长度等方面进行优化。试验结果可以有效优化桩身设计,为复杂基坑在开挖过程中的支护结构受力及变形提供参考性依据。

This paper aims to study the development and distribution features of the internal force, bending moment and dis- placement of cantilever fender pile. Data used in this paper are obtained from field experiment on the construction site of Xi＇ning railway station. The behaviors of cantilever fender pile under different excavations and the development of internal force are present- ed. The force features of cantilever fender pile are different from the theoretical value, which can verify that the optimization of rein- forcement, concrete strength design and embedment depth is feasible. Results of this paper can effectively optimize the design of pile, and can also provide monitoring and control for the force and deformation of supporting structure in the process of the complex excavation pit.