摘要
对人工挖孔桩护壁受力进行分析,选取合适的土压力计算模型,综合理论和工程实践,提出护壁厚度的理论计算方法及过程;结合深圳市工程实例,对护壁的厚度和配筋进行设计,与实际采用的设计方案进行对比;最终确定土压力模型为地面以下5m为三角形分布,其余为矩形分布;给出了常用尺寸挖孔桩的护壁厚度及配筋设计参数表;圆桩因拱效应明显,可适当调整设计参数;研究结果供工程设计应用参考。
This paper presents a supporting system design method for the manually excavation caissons. The earth pressure dis- tributions in the manually excavated caissons are analyzed and the supporting reinforced concrete thickness can be estimated. The reinforcement bar design example was provide in the paper by using an excavation project in Shenzhen. Triangular lateral earth pressure distribution can be found up to five meters below the ground. After this depth, a constant lateral earth pressure can be assumed. The reinforcement table for various caisson diameters is also provided in the paper. Further, due to the arch effect of the caisson, these parameters are conservative and could adjusted to smaller values.
出处
《土工基础》
2016年第3期349-351,361,共4页
Soil Engineering and Foundation
关键词
人工挖孔桩
土压力
护壁
配筋
Manually Excavated Caisson
Earth Pressures
Caisson Supporting System
Reinforcement Bars
