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（臨汾市建筑勘察設(shè)計(jì)院， 臨汾 041000）
［摘要］對于采用框架-核心筒、框架-剪力墻結(jié)構(gòu)的高層建筑以及主裙連體的大底盤基礎(chǔ)設(shè)計(jì)，控制主樓與裙房之間、內(nèi)筒（或剪力墻）與框架柱之間的差異沉降是地基基礎(chǔ)設(shè)計(jì)的關(guān)鍵，《建筑樁基技術(shù)規(guī)范》（JGJ 94—2008）的變剛度調(diào)平設(shè)計(jì)、灌注樁后注漿技術(shù)為這類問題提供了很好的解決方案。介紹了廣奇財(cái)富中心二期工程的地基基礎(chǔ)設(shè)計(jì)。樁基設(shè)計(jì)強(qiáng)化豎向剛度大、豎向荷載集中的主樓內(nèi)部剪力墻區(qū)域，強(qiáng)化指數(shù)為1-21，弱化荷載分散的框架柱區(qū)域，弱化指數(shù)為0-91。主樓的框架柱區(qū)域按復(fù)合樁基考慮，主樓以外的裙房區(qū)域采用天然地基。采用灌注樁后注漿技術(shù)使單樁承載力提高約80％。單樁靜載試驗(yàn)顯示，最大試驗(yàn)荷載下各試樁樁頂沉降很小且數(shù)值接近。沉降實(shí)測結(jié)果表明，建筑物基礎(chǔ)總沉降、差異沉降遠(yuǎn)小于相關(guān)規(guī)范的變形允許值。變剛度調(diào)平設(shè)計(jì)、灌注樁后注漿技術(shù)為工程節(jié)約了可觀的工程費(fèi)用，經(jīng)濟(jì)效益顯著。
［關(guān)鍵詞］變剛度調(diào)平設(shè)計(jì)； 灌注樁后注漿； 差異沉降
中圖分類號：TU473文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)09-0108-04
Application of techniques on variable stiffness leveling design and post grouting for cast-in-situ pile in Phase Ⅱ Project of Guangqi Fortune Center
An Yiqing
(Linfen City Architectural Survey and Design Institute, Linfen 041000, China)
Abstract:For design of frame-tube, frame-shear structure and large chassis base connecting main buildings and podium, the key to foundation design is to control the differential settlement between the main building and the podium, and between the inner tube (or shear wall) and the frame column, the variable stiffness leveling design and the post-grouting technology for cast-in-situ piles of the Technical code for building pile foundations (JGJ 94—2008) provide a good solution to this problem. The foundation design of Phase Ⅱ of Guangqi Fortune Center was introduced. The design of the pile foundation enhanced the shear wall region of the main building with large vertical stiffness and vertical load concentration with the enhanced index of 1-21; the frame column region with distributed load was weakened with the weakening index of 0-91. The frame column area of the main building was considered as a composite pile foundation, and the podium area outside the main building adopted the natural foundation. The use of post grouting technique for cast\|in\|situ pile increased the bearing capacity of single piles by approximately 80%. Single pile static load test shows that the maximum test load settlement of top of each test pile is small and the value is close. The actual settlement test results show that the total foundation settlement and differential settlement of the building are far less than the permissible deformation values of the relevant specifications. The variable stiffness leveling design and post grouting technique for cast-in-situ pile saved considerable engineering costs for the project, resulting in significant economic benefits.
Keywords:variable stiffness leveling design; post grouting for cast-in-situ pile; differential settlement
作者簡介：安一清，本科，總工程師，高級工程師，一級注冊結(jié)構(gòu)工程師，Email：18007862@qq.com。
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