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（1 華藍設計(集團)有限公司， 南寧 530011； 2 重慶大學土木工程學院， 重慶 400045）

［摘要］本文結(jié)合某實際工程，采用FLAC3D數(shù)值模擬，分析軟土地區(qū)基坑底加固對懸臂式排樁支護結(jié)構的側(cè)移、側(cè)壓力、地表沉降分布情況和變化規(guī)律，并結(jié)合現(xiàn)場監(jiān)測數(shù)據(jù)與理正深基坑軟件的計算結(jié)果進行對比驗證。結(jié)果表明：排樁的側(cè)移最大值出現(xiàn)在排樁頂部，坑底加固可使側(cè)移減小1/3~1/2；坑底加固基本不改變排樁上土側(cè)壓力；地表沉降最大值發(fā)生在基坑邊緣，坑底加固可使地表沉降減小約1/2；提出了坑底加固的深度和寬度的建議值。

［關鍵詞］坑底加固； 數(shù)值分析； 軟土地區(qū)； 深基坑

中圖分類號： TU46+3 文獻標識碼： A文章編號：  1002-848X(2016)S2-0540-05

Analysis on effect of foundation pit bottom reinforcement on pile cantilever retaining structure

Liao Sunjing1， Wu Shuguang2

(1 Guangxi Hualan Design & Consulting Group, Nanning 530011, China;

2 School of Civil Engineering, Chongqing University, Chongqing 400045, China)

Abstract: A practical project using FLAC3D numerical simulation, analysis of soft soil foundation reinforcement on the bottom row of piles cantilever structure lateral, lateral pressure, surface subsidence distribution and variation, and with the rationale for deep excavation software calculations combined with field monitoring data contrast verification. The results showed that: the maximum lateral row of piles in pile top, bottom lateral reinforcement can reduce 1/3~1/2; Bottom Strengthening basic soil without changing the lateral pressure on the pile; maximum surface subsidence occurred in the pit edge, bottom reinforcement surface subsidence can be reduced by about 1/2. Bottom reinforcement and proposed recommendations depth and width values.

Keywords: pit bottom reinforcement; numerical analysis; soft soil area; deep foundation pit