- 摘 要
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（1 三江學(xué)院土木工程學(xué)院， 南京 210012； 2 江蘇華東工程設(shè)計有限公司， 南京 210007； 3 東南大學(xué)土木工程學(xué)院， 南京 211189）
［摘要］依托某實際深基坑工程，通過計算分析、監(jiān)測數(shù)據(jù)驗證對先淺后深深基坑支護設(shè)計和施工中的關(guān)鍵技術(shù)進行了研究。研究表明，深淺基坑交界處存在較大高差時，可通過采用增大支護樁及支撐剛度、加固坑內(nèi)被動區(qū)土體、加強止水帷幕以及嚴(yán)控施工質(zhì)量等一系列措施，減小深基坑開挖對鄰近已建建筑物及淺基坑的影響，確保結(jié)構(gòu)的安全與穩(wěn)定。深淺基坑交界處，后施工的深基坑支護樁可通過適當(dāng)提高樁頂標(biāo)高，使后施工的深基坑形成獨立封閉體系，方便后期水平支撐的拆換撐施工； 并可通過樁頂箍筋加密的方式來解決支護樁上部超出土面部分的抗剪強度問題。
［關(guān)鍵詞］先淺后深的基坑施工； 深基坑； 支撐軸力； 不均勻沉降
中圖分類號：TU745-3文獻標(biāo)識碼：A文章編號：1002-848X(2020)23-0123-05
Design and analysis of the deep foundation pit project constructed from shallow to deep
ZHOU Yali1, JIN Xuelian2, ZHU Mingxing3
(1 School of Civil Engineering, Sanjiang University, Nanjing 210012, China; 2 Jiangsu East China Engineering Design Co., Ltd., Nanjing 210007, China; 3 School of Civil Engineering, Southeast University, Nanjing 211189, China)
Abstract:Based on an actual deep foundation pit engineering project, theoretical analysis and monitoring data verification were conducted to study the key technologies in the design and construction of deep foundation pit supports constructed from shallow to deep. The results indicate that if there is a large difference between the deep pit depth and shallow pit depth, applicable measures can be adopted, such as increasing the rigidity of support piles and supports, reinforcing the soil in the passive zone in the pit, strengthening the water-stop curtain and strictly controlling the construction quality, to reduce the impact of deep pit excavation on the adjacent completed buildings and shallow pits, and ensure the safety and stability of the structure. At the junction of deep and shallow foundation pits, the post-construction deep foundation pit supporting piles can be appropriately raised to increase the pile top elevation so that the post-construction deep foundation pit forms an independent closed system, which facilitates the removal and replacement of horizontal supports in the later stage; the problem of the shear strength of the upper part of the supporting pile beyond the soil surface can be solved by the method of densification of the pile top stirrup.
Keywords:foundation pit construction from shallow to deep; deep foundation pit; axial force of support; uneven settlement
*國家自然科學(xué)基金青年科學(xué)基金項目（51808112），江蘇省基礎(chǔ)研究計劃（自然科學(xué)基金）-青年基金項目（BK20180155）。
作者簡介：周亞麗，碩士，工程師，Email: 397551631@qq.com。
