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钱源兵，刘亮

（ 江苏省地质环境勘查院，江苏 南京210018）

摘 要：本研究旨在探究不同开挖深度及支护参数对建筑深基坑支护稳定性的影响。以某建筑为研究对象，该建筑采用双排桩加3排预应力锚索复合支护结构。基于地质条件，构建了渗流应力耦合的有限元模型。利用PLAXIS有限元软件，对不同开挖深度及支护参数下的基坑支护稳定性进行了数值模拟分析。结果表明，随着开挖深度的增加，支护结构的水平位移和弯矩逐渐增大，稳定性降但仍具有良好的稳定性；增加支护桩的嵌固深度和桩径均可有效减小水平位移和弯矩。该工程的最佳嵌固深度为10 m，最佳桩径为1.1 m，控制排距不超过4.0 m。

关键词：渗流应力；耦合模型；深基坑；支护；稳定性

中图分类号：TU473.2                     

文献标志码：A           

文章编号：1005-8249（2024）02-0075-06

DOI：10.19860/j.cnki.issn1005-8249.2024.02.014

 

 

QIAN Yuanbing , LIU Liang

( Geological Environment Exploration Institute of Jiangsu Province, Nanjing Jiangsu 210018,China )

Abstract: This study aims to explore the influence of different excavation depths and support parameters on the stability of deep foundation pit support in buildings，taking a building as the research object, the building adopts a composite support structure of double row piles and 3 rows of prestressed anchor cables. Based on the geological conditions , a finite element model coupled with seepage stress was constructed. Numerical simulation analysis was conducted on the stability of foundation pit support under different excavation depths and support parameters using PLAXIS finite element software. The results indicate that as the excavation depth increases, the horizontal displacement and bending moment of the support structure gradually increase, and the stability decreases,but still has good stability; increasing the embedding depth and pile diameter of the support pile can effectively reduce horizontal displacement and bending moment. The optimal embedding depth of the profect is determined to be 10 m, the optimal pile diameter is 1.1m, and the control row spacing does not exceed 4.0m.

Keywords:seepage stress; coupling model; deep foundation pit; support; stability

 

 

 

 

 

 

作者简介：钱源兵（1980—），男，本科，高级工程师，主要研究方向：水文地质，工程地质。

收稿日期：2023-11-14