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錢源兵，劉亮

（ 江蘇省地質環境勘查院，江蘇 南京210018）

摘 要：本研究旨在探究不同開挖深度及支護參數對建筑深基坑支護穩定性的影響。以某建筑為研究對象，該建筑采用雙排樁加3排預應力錨索復合支護結構。基于地質條件，構建了滲流應力耦合的有限元模型。利用PLAXIS有限元軟件，對不同開挖深度及支護參數下的基坑支護穩定性進行了數值模擬分析。結果表明，隨著開挖深度的增加，支護結構的水平位移和彎矩逐漸增大，穩定性降但仍具有良好的穩定性；增加支護樁的嵌固深度和樁徑均可有效減小水平位移和彎矩。該工程的最佳嵌固深度為10 m，最佳樁徑為1.1 m，控制排距不超過4.0 m。

關鍵詞：滲流應力；耦合模型；深基坑；支護；穩定性

中圖分類號：TU473.2                     

文獻標志碼：A           

文章編號：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

 

 

 

 

 

 

作者簡介：錢源兵（1980—），男，本科，高級工程師，主要研究方向：水文地質，工程地質。

收稿日期：2023-11-14