设抗震增强体的桩基础力学特性的原位试验研究

Analysis of Mechanical Behavior of the Pile Foundation with Reinforced Solidification Body by Field Tests

在过去的大地震中,许多桩基础因强烈振动和地基变形而遭受结构性破坏,因而提出一种既可以应用于新建桩基础,也可以应用于现有桩基础的抗震加固方法,即采用地基加固技术在桩基础中设置抗震增强体,以与桩基础的钢筋混凝土承台形成双层抗弯结构。采用等比例模型原位水平载荷试验和振动试验以及开挖检查等方法,对抗震加固的力学特性和构建质量进行加固前后的对比研究,进而证实了该加固方法的有效性和可行性,为同类工程起到了一定的参考意义。

During large earthquakes, many pile foundations were suffered from structural damage due to strong vibration and ground deformation. Thus an earthquake resistant reinforcement method applicable to either new or existing pile foundations was proposed in this paper, which is to set an earthquake resistant reinforcement body around the piles, and increase the stiffness of the pile foundation by the effect of a two layered bent structure by the reinforcing body made in the ground. By appling full scale model, lateral loading tests, vibration tests and excavation observation has been carried out, and the mechanical characteristics and construction quality of reinforcement has been analyzed. The comparison between before and after construction of reinforcement identified the validity and feasibility of earthquake resistant reinforcement method.