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（1 同濟大學土木工程學院 上海 200092； 2 寧波市建筑設計研究院 315010）
【提要】 針對某三層地下停車庫基坑支護結構，進行了圍護樁的支撐道數(shù)、支撐位置、圍護樁的樁型、嵌固深度以及土層參數(shù)取值等五方面的優(yōu)化設計，比較了有、無對撐支撐方式的兩種支撐結構。計算表明，多種基坑支護方案的比較不僅節(jié)省工程造價，而且能提高基坑支護工程抗風險的能力。采用邊坡加支護樁和內(nèi)支撐基坑支護方案對開挖深度超過10m的基坑，可設兩道支撐，支撐位置應盡量往下壓，同時應控制基坑水平向的位移量。內(nèi)支撐平面布局應綜合考慮各種因素，盡量選用無對撐支撐方式。
【關鍵詞】 基坑支護 停車庫 排樁 嵌固深度
Analysis on Supporting Structure for a Underground Parking Foundation Pit/Wu Zhehua1,2, Xu Yang2, He Libo2, Xu Guoping2, Chen Yiyi1，Song Zhenqi2(1 Department of Civil Engineering,Tongji University,Shanghai 200092,China; 2 Ningbo Architectural Design & Research Institute, Ningbo  315010,China)
Abstract:Based on designing project of a threefloor underground parking, the optimization  design is discussed including the rows and situation  of  braces,the
 type  of pile,the embedded depth of pile and the value of c，φ of soil. Bracing system w
ith or without opposite braces is compared. For saving cost of construction and raising ability of antirisk,analysis and comparison of the multiple schemes are needed. The combination
 of slope and piles in row within bracing system is desirable to build foundation pit with  10m depth excavation. Two bracings and lower site of bracing would be more effective. Horizontal displacement of pit should be controlled.Bracing system around pit is preferred.
Keywords:foundation pit; supporting structure; parking; piles in row; embedded depth