土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (3): 344-349.

• 工程实录 • 上一篇    下一篇

双排桩支护体系方案优化研究

姜广占，罗隽旻，蒋 凯   

  1. （广西华蓝岩土工程有限公司，南宁 530200）
  • 收稿日期:2022-01-07 修回日期:2022-01-13 出版日期:2022-06-30 发布日期:2022-06-24
  • 作者简介:姜广占（1980-），男，高级工程师，研究方向为岩土工程。

Optimization of Double-Row Piles for the Deep Excavation Supporting Structure

JIANG Guangzhan, LUO Junmin, JIANG Kai   

  1. (Guangxi Hualan Geotechnical Engineering Co. Ltd, Nanning 530200)
  • Received:2022-01-07 Revised:2022-01-13 Online:2022-06-30 Published:2022-06-24

摘要： 以南宁市某双排桩支护体系的深基坑工程为背景，通过理正深基坑设计软件对该工程提供的双排桩设计方案进行优化，采用FLAC3D数值差分计算软件建立三维数值分析模型，对不同设计参数情况下围护结构变形特性进行分析。结果表明：增加排距能有效减少围护桩桩身水平位移，降低工程风险；随着后排桩桩长与桩径减小，围护桩桩身水平位移逐渐增大，但其值在规范允许范围之内，因此可以在保证基坑安全的基础上适当减小后排桩桩长与桩径，节约经济成本。研究成果可为双排桩优化设计提供参考。

关键词: 理正深基坑, 双排桩, 参数分析, 方案优化

Abstract: This paper presents the optimization results of double-row piles as the deep excavation supporting structures for a case history in Nanning, Guangxi. A three-dimension numerical model of the supporting structure of double-row piles to analyze the deformation characteristics under various conditions was established by commercial finite difference software FLAC3D. The results indicated that the increasing the row spacing can effectively reduce the excavation induced risk and the horizontal displacement of the piles. The horizontal displacement in the double row soldier pile is gradually increasing with the decrease of the pile length and the diameter of the rare-row piles but the deflection value is within the allowed range. Therefore, the length and the diameter of the rare-row piles can be appropriately reduced if the safety of the excavation can be ensured.

Key words: deep excavation design software, doublerow piles, parametric analysis, design optimization

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