双排桩基悬臂式挡土墙参数影响研究分析

Analysis on Parameter Influence of Double-Row Pile Foundation Cantilever Retaining Wall Structure

针对传统悬臂式挡土墙不能用于软土地基、发生不均匀沉降的填方体地基、以及地震烈度较高的地震区等工况,并对挡土墙的使用高度进行了限制,论文作者提出了一种双排桩基悬臂式挡土墙结构,大大拓展了传统悬臂式挡土墙的应用范围,开展双排桩基悬臂式挡土墙的结构参数影响分析,对工程实践具有重要的指导意义。研究结论:(1)双排桩基横向排间距宜为3~4倍桩径或桩宽,且不宜超过6 m;(2)双排桩基上部悬臂式挡土墙的悬臂高度与底板宽度比值宜在1. 6~2. 0范围内选取;(3)悬臂式挡土墙底板厚度变化对桩基受力及结构变形影响较小,过大的底板厚度不利于底板受力;(4)在软土地基工况下,结构设计时应注意底板与悬臂连接处、底板与桩基连接处、桩顶处以及桩基锚固点等截面的安全检算;(5)为改善结构受力和有效控制结构变形量,地基软土较厚时应对软土地层进行复合地基加固;(6)该研究成果可为工程实践提供重要的指导借鉴作用。

Due to the traditional cantilever retaining wall has the following disadvantages： unavailable to be used in the soft ground, the filling foundation with uneven settlement, and in the strong earthquake area, and also the applied height limitation of retaining wall, the use of traditional cantilever retaining wall is limited. In order to enlarge application range of the cantilever retaining wall, the author proposes a double-row pile foundation cantilever retaining wall structure, and the analysis of the influence of the structural parameters has an important guiding significance for the engineering practice. Research Conclusions ： （ 1 ） The optimal range of transverse space of double - row piles is 3 - 4 times of the pile diameter and should not exceed 6m; （2） The ratio of the height of the cantilever to the width of the floor should be selected within the range of 1.6 - 2.0 ; （ 3 ） The height of the cantilever＇s floor has little influence to the stress and defomlation. Thicker floor has disadvantage to the stress of the floor; （4）Under the soft soil foundation conditions, safety inspection to the sections like the joints of the bottom plate and the pile cantilever, the joints of the bottom plate and the pile foundation, the pile top and anchor point of pile foundation should be paid attention in structure design; （5） In order to improve structural rigidity and control structm~ defommtion, the composite foundation should be taken when the soft soil is thicker; （6） The research results can provide important guidance for engineering practice.