微型桩大型振动台试验-坡体及桩动力特性研究

发布时间：2018-02-23 20:19

本文关键词： 微型桩大型振动台试验地震作用坡体变形桩顶位移内力分布　出处：《铁道工程学报》2017年09期 　论文类型：期刊论文

【摘要】：研究目的:微型桩是一种柔性支挡结构,在地震中其发生弯曲变形,可以有效避免脆性破坏的发生,因而在抗震加固中常被优先采用。目前,对微型桩的研究多集中于其静力学特性,通过大型振动台试验进行其动力学特性的研究很少。为研究微型桩及其加固边坡的动力学特性,本文就平行体系和"人"字形体系两类微型桩支护边坡的大型振动台试验及数值计算展开分析,并比较两类微型桩的抗变形能力和承载能力。研究结论:(1)边坡在地震作用下变形最先开始于坡体后缘的张拉裂缝,坡体中竖向裂缝较多,水平地震作用对坡体的变形影响更大;(2)地震作用下,微型桩变形表现为以滑面为界的"S"形弯曲变形和桩顶绕桩底的旋转变形;(3)微型桩弯矩呈现"S"形分布,剪力呈现"■"形分布;(4)"人"字形体系微型桩的抗变形能力和承载能力较平行体系微型桩更强;(5)本研究成果主要应用于边坡工程的抢险与加固。
[Abstract]:Research purpose: micro pile is a kind of flexible retaining structure, which has bending deformation in earthquake, which can effectively avoid brittle failure, so it is often preferred to be used in seismic reinforcement. In order to study the dynamic characteristics of micro-pile and its reinforced slope, the research of micro-pile is mostly focused on its static characteristics, but the dynamic characteristics of micro-pile are seldom studied by large-scale shaking table test. In this paper, the large-scale shaking table test and numerical calculation of two kinds of micro-pile supporting slope, parallel system and "human" system, are analyzed. The deformation resistance and bearing capacity of the two kinds of micro-piles are compared. The research conclusion is that the deformation of the slope begins at the extension crack at the back edge of the slope under earthquake, and the vertical cracks in the slope body are more. Under the action of horizontal earthquake, the deformation of micro-pile shows "S" shape bending deformation with sliding surface as the boundary and the rotation deformation of pile top with pile bottom as "S" shape distribution. The shear force presents "shape distribution" (4) "man" zigzag system micro-pile 's anti-deformation ability and bearing capacity stronger than parallel system micro-pile (5) this research result is mainly used in slope engineering emergency and reinforcement.
【作者单位】：中铁西北科学研究院有限公司;
【基金】：甘肃省自然科学基金项目(145RJZA068)
【分类号】：TU473.1

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