- 摘 要
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（蘇州九城都市建筑設(shè)計有限公司， 蘇州 215123）
［摘要］蘇州中心廣場是一個大型商業(yè)綜合體項目，由多幢超高層塔樓、裙樓及大底盤組成。在南區(qū)樁基設(shè)計中，參考周邊項目樁基設(shè)計資料，結(jié)合本工程實際情況，對樁的類型和持力層進行了合理選擇。試樁結(jié)果表明，采用后注漿既可提高鉆孔灌注樁的成樁質(zhì)量和單樁承載力特征值，又可減少基礎(chǔ)沉降。采用樁基變剛度調(diào)平設(shè)計，即考慮上部結(jié)構(gòu)形式、荷載和地層分布以及相互作用效應(yīng)，通過調(diào)整樁徑、樁長、樁距等改變樁基支承剛度分布，以控制建筑物的差異沉降。沉降實測數(shù)據(jù)表明，變剛度調(diào)平可有效減小塔樓與裙房及地下室之間的差異沉降。通過考慮最低水位和承臺效應(yīng)的有利作用及對上部荷載、樁配筋進行細化、優(yōu)化等措施，可減少裙房及地下室的樁數(shù)和樁配筋，節(jié)約樁基造價約3 856-4萬元。
［關(guān)鍵詞］灌注樁基； 后注漿； 變剛度調(diào)平設(shè)計； 差異沉降； 優(yōu)化設(shè)計
中圖分類號：TU473文獻標識碼：A文章編號：1002-848X(2018)18-0101-06
Design and optimization of pile foundation in the southern district of Suzhou Central Square project
Zhong Jianmin
(Suzhou Nine Urban Architectural Design Co., Ltd.， Suzhou 215123， China)
Abstract:Suzhou Central Square is a large-scale commercial complex project composed of several super high-rise towers, podiums and large chassis. In the design of pile foundation in the southern district，the type of pile and the bearing stratum were selected reasonably according to the information of pile foundation design of the surrounding projects and the actual situation of this project. The pile test results show that adopting post grouting technique can improve the pile forming quality and the bearing capacity of the single pile and reduce the foundation settlement. Optimized design of foundation stiffness to reduce differential settlement of pile foundation, namely taking into account the form of superstructure, load, stratum distribution and their interaction effect, was adopted to control the differential settlement of buildings by adjusting pile diameter, pile length and pile distance to change support stiffness distribution of pile foundation.The measured data of settlement show that this optimization design can effectively reduce the different settlement between the tower and the podium and basement subsidence. By considering the effects of the minimum water level and the favorable capping effect，and the measures for the refinement and optimization of the upper load and the pile reinforcement，the piles and pile foundation reinforcement of the podium and basement can be reduced. The cost of the pile foundation is saved by about 38-564 million yuan.
Keywords:cast-in-situ pile foundation; post grouting; optimized design of foundation stiffness to reduce differential settlement; different settlement; optimization design
作者簡介：鐘建敏，碩士，高級工程師，一級注冊結(jié)構(gòu)工程師，一級注冊土木工程師（巖土），Email：82503755@qq.com。
