可控刚度桩筏基础在不均匀地基中的应用研究
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摘要
福建省厦门市某项目地基为典型的不均匀地基,经多次论证,基础形式拟采用可控刚度桩筏基础,通过桩顶设置不同刚度的变形调节装置调节桩基支承刚度,控制桩筏基础整体沉降差。数值分析结果显示,整块筏板呈典型"碟形"沉降,差异沉降仅1cm,总沉降量与差异沉降控制良好,避免建筑物出现倾斜。区域Ⅰ中地基土承载力得到充分发挥,桩顶反力均满足设计要求,表明本工程可控刚度桩筏基础设计方案合理可行。
A typical uneven foundation in Xiamen,after many demonstrations,the foundation form is to adopt a controllable stiffness pile-raft foundation,and the deformation support device with different stiffness is set through the top of the pile to adjust the support stiffness of the pile-raft foundation. Control the overall settlement difference of the pile-raft foundation. The numerical analysis results show that the whole raft has a typical "dish-shaped"settlement,and the differential settlement is only 1 cm. The total settlement and differential settlement are well controlled to avoid the tilting of buildings. The bearing capacity of the foundation soil in Zone I is fully exerted,and the reaction force of the pile top meets the design requirements, which indicates the rationality of the design scheme of the controlled pile foundation.
A typical uneven foundation in Xiamen,after many demonstrations,the foundation form is to adopt a controllable stiffness pile-raft foundation,and the deformation support device with different stiffness is set through the top of the pile to adjust the support stiffness of the pile-raft foundation. Control the overall settlement difference of the pile-raft foundation. The numerical analysis results show that the whole raft has a typical "dish-shaped"settlement,and the differential settlement is only 1 cm. The total settlement and differential settlement are well controlled to avoid the tilting of buildings. The bearing capacity of the foundation soil in Zone I is fully exerted,and the reaction force of the pile top meets the design requirements, which indicates the rationality of the design scheme of the controlled pile foundation.
引文
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[2]林树枝,周峰,屈伟.端承桩复合桩基在岩溶地区的工程实践[J].福建建筑,2014(9):1-4,17.
[3]周峰,屈伟,郭天祥,等.基于沉降控制的端承型复合桩基工程实践[J].岩石力学与工程学报,2015,34(5):1071-1079.
[4]林树枝,郭天祥,冯新建,等.两阶段变刚度桩筏基础承载力可靠度分析及其在高层建筑基础的应用[J].福建建设科技,2013(2):1-4.
[5]宰金珉,宰金璋.高层建筑基础分析与设计[M].北京:中国建筑工业出版社,1993.
[6]尹红,张旷成,吕永清.深圳市某32层高层建筑采用天然地基的探讨[J].岩土工程技术,2002(5):302-306.
[7]金云平,顾晓鲁.高层建筑天然地基基础形式的运用[J].岩土力学,2001(2):189-191.
[8]宰金珉,周峰,梅国雄,等.自适应调节下广义复合基础设计方法与工程实践[J].岩土工程学报,2008(1):93-99.
[9]宰金珉.复合桩基理论与应用[M].北京:知识产权出版社,2004.