论文部分内容阅读
采用高承台群桩-独柱墩结构体,进行可液化场地群桩-土-桥梁结构地震相互作用振动台试验,再现自然地震触发地基液化及桩基破坏等宏观现象;通过试验监测了液化场地中地基的加速度、孔压反应以及桩-柱墩的加速度、位移、应变反应和上部结构的加速度反应等。结果表明:输入地震波幅值和埋深是影响砂层孔压的重要因素;地震作用中,随着场地液化的发展,自下而上砂层加速度先逐渐减弱后逐渐放大;高承台桩基地震响应与土层土性、地震动大小、场地液化程度等密切相关,地震作用下场地液化容易诱发高承台群桩体系的倒塌。
The high pile cap pile-single column pier structure is used to carry out the shaking table test of pile-soil-bridge seismic interaction in liquefiable site, which can reproduce macro-phenomena such as liquefaction and pile foundation destruction triggered by natural earthquakes. The acceleration of foundation, the pore pressure response, the acceleration of pile-pillar piers, the displacement, the strain response and the acceleration response of the superstructure. The results show that the input seismic amplitude and depth are the important factors that affect pore pressure. During the earthquake, with the development of site liquefaction, the acceleration of bottom-up sand layer gradually decreases gradually and then gradually enlarges. The seismic response of high cap pile foundation It is closely related to the soil properties, the magnitude of ground motion and the degree of liquefaction of the site. Liquefaction of the site under the earthquake can easily induce the collapse of the pile cap pile system with high capstans.