面向公路工程的排桩支护结构数据分析与施工要点探析

Analysis on Construction of Pile Row Supporting Structure for Highway Engineering

采用有限元法分析了双排桩基坑支护结构在不同双排距、桩体土强度下的双排桩变形、土拱效应和土压分布特征,探讨双排桩下支护结构的作用机制。研究结果表明:不同排距下的桩间土体最大位移与土体刚度间呈现出双曲线关系。当排距小于9 cm时,前排桩桩侧压力表现出一个R型分布曲线,基坑上部呈现出一个三角形分布,在尖端取得最大值,基坑底部水平部分为R性拐点,基坑下部呈现出R型局部。在小排距下,双排桩所呈现的三角形土压力分布被束缚而为充分展现。当桩间土体刚度小于1. 5 E,通过在桩间土体实施硬拌混凝土能明显地提高桩间土体的强度,且在较小排距下来加固桩间土体能够有效控制桩身侧的位移量,提高双排桩的强度。

This paper USES the finite element method(fem)analysis of the foundation pit supporting structure with double-row piles in different double row distance,pile soil strength the double-row piles,the deformation of soil arching effect and earth pressure distribution characteristics,to explore the mechanism of action of double-row piles supporting structure under.The results show that there is a hyperbolic relationship between the maximum displacement of soil between piles with different row spacing and the stiffness of soil.When the row spacing is less than 9 cm in front of the pile type pressure gauge shows a R distribution curve,the upper pit presents a triangular distribution,the maximum in cutting-edge,foundation pit horizontal section at the bottom of the R the inflection point,pit bottom presents partial R type.Under the small row spacing,the triangular soil pressure distribution of the double-row pile is restrained and fully displayed.When the stiffness of soil between piles is less than 1.5 E,the strength of soil between piles can be significantly increased by stiffening concrete between piles.In addition,the soil between piles can effectively control the displacement of pile body side and improve the strength of double-row pile.