- 摘 要
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（1 南京工業(yè)大學(xué)交通運輸工程學(xué)院, 南京 210009； 2 南京水利科學(xué)研究院巖土工程研究所, 南京 210024； 3 廈門市建設(shè)局, 廈門 361003)
［摘要］在土巖溶組合地層的高層建筑設(shè)計中，由于地基土支承剛度不均勻，導(dǎo)致建筑物基礎(chǔ)的承載力不足或不均勻沉降較大，常規(guī)設(shè)計方法無法保證建筑物安全。以典型工程為例，詳細(xì)論述樁筏基礎(chǔ)主動控制技術(shù)應(yīng)用于該項目的設(shè)計計算過程，并通過有限元模型與現(xiàn)場監(jiān)測數(shù)據(jù)驗證其合理性與可靠性。該工程在黏土分布區(qū)采用樁側(cè)和樁端后注漿摩擦樁，在基巖區(qū)域通過削弱基巖支承剛度，采用在樁頂設(shè)置剛度調(diào)節(jié)裝置的樁（墩）基礎(chǔ)，保證了黏土分布區(qū)支承剛度與基巖區(qū)支承剛度相匹配，滿足承載力的同時有效地控制了基礎(chǔ)的差異沉降。同時數(shù)值計算結(jié)果也表明，此工程基礎(chǔ)設(shè)計方案是合理的，實測結(jié)果顯示建筑物的不均勻沉降和總體沉降量均較小，驗證了在樁頂設(shè)置剛度調(diào)節(jié)裝置在土巖溶復(fù)雜地質(zhì)條件下的適應(yīng)性，取得了顯著的經(jīng)濟效益。
［關(guān)鍵詞］沉降控制； 剛度調(diào)節(jié)裝置； 地基土支承剛度； 樁土共同作用； 變剛度調(diào)平； 復(fù)合地基
中圖分類號：TU473-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)06-0116-06
Design of controllable stiffness pile-raft foundation in soil-Karst composite area
Zhou Feng1, Zhu Rui1, 2, Wang Xudong1, Lin Shuzhi3
(1 College of Transportation Science and Engineering, Nanjing Tech University, Nanjing 210009, China; 2 Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China;3 Xiamen Construction and Administration Bureau, Xiamen 361003, China)
Abstract:In the design of high-rise building in soil-Karst composite area, the foundation soil bearing stiffness is not uniform, which often leads to weak bearing capacity or larger uneven settlement. The conventional design method cannot guarantee the safety of buildings. A typical project was used as an example to describe the design and calculation process of the application of active control technology of pile raft foundation. The rationality and reliability of the application were verified through the field monitoring data and finite element analysis. This project used the friction pile with grouting technique of lateral and tip in the clay area. The supporting stiffness of the clay region was matched with the supporting stiffness of the bedrock area by weakening the support stiffness of the bedrock area and setting the stiffness adjustment device on the top of pile by pier foundation. All these effectively controlled the differential settlement of the foundation and satisfied the requirement of bearing capacity.Meanwhile numerical results show the rationality of the design scheme and the measured results show that the uneven settlement and the total settlement of the building are small, which verify that the stiffness adjustment device on the top of pile is adaptable to the complex geological condition of Karst region and remarkable economic benefit has been obtained.
Keywords:settlement control; stiffness adjustment device; supporting stiffness of foundation soil; pile-soil interaction; variable stiffness leveling; composite foundation
*國家自然科學(xué)基金面上項目（51778287）。
作者簡介：朱銳，博士研究生，Email: yzzhurui@163.com。
