土工基础

›› 2016, Vol. 30 ›› Issue (3): 349-351.

• 工程实录 • 上一篇    下一篇

人工挖孔桩护壁计算及研究

何珊珊，王贤能   

  1. （深圳市工勘岩土集团有限公司，深圳 518000）
  • 收稿日期:2015-06-11 修回日期:2015-06-30 出版日期:2016-06-20 发布日期:2016-06-21
  • 作者简介:何珊珊（1989-），女，硕士，工程师，研究方向为岩土工程。

Supporting Design of Manually Excavated Caissons

HE Shanshan, WANG Xianneng   

  1. (Shenzhen Gongkan Geotechnical Group Co., Ltd., Shenzhen 518000)
  • Received:2015-06-11 Revised:2015-06-30 Online:2016-06-20 Published:2016-06-21

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5 m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。

关键词: 人工挖孔桩, 土压力, 护壁, 配筋

Abstract: This paper presents a supporting system design method for the manually excavation caissons. The earth pressure distributions 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.\=

Key words: Manually Excavated Caisson, Earth Pressures, Caisson Supporting System, Reinforcement Bars