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桩基础变刚度调平设计量化控制指标研究

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考虑到当前规范缺乏可以实操的桩基变刚度调平具体设计细则和方法,实际设计环节也尚无明确、可控的量化指标,对模型试验和设计实践成果进行分析,提出桩基变刚度调平设计计算方法和设计原则.通过室内大型模型试验成果对变刚度调平具体控制指标进行量化分析研究,得出强化指数在1＜λs＜1.30范围内时,标准沉降比、标准刚度比与强化指数大致成线性关系,进而提出核心筒区域强化指数宜为1.05～1.30,外框区域的弱化指数宜为0.70～0.95.采用上述控制指标进行野外大型变刚度调平桩筏基础模型试验设计研究.结果表明,不均匀沉降大幅减小,实测最大差异沉降均小于规范规定允许值.可见采用上述指标进行变刚度调平设计对于控制差异沉降效果显著.
Quantitative study on control indexes of optimized design of pile foundation stiffness to reduce differential settlement
Considering that the current standards lack practical design rules and methods for optimized design of pile foundation stiffness to reduce differential settlement,and there are no clear and controllable quantitative indicators in the actual design process,the results of model experiments and design practices were summa-rized,and the calculation method for optimized design of pile foundation stiffness to reduce differential settle-ment and principles were proposed.Quantitative analysis and research on specific control indicators for varia-ble stiffness leveling were conducted based on the results of large-scale indoor model experiments,and the re-inforcement index was given at 1＜λs＜1.30.The standard settlement ratio and standard stiffness ratio are roughly linearly related to strengthening index within the range 1＜λs＜1.30.It is proposed that the strengthe-ning index of the core tube area should be 1.05-1.30,and the weakening index of the outer frame area should be 0.70-0.95.The above control indicators were used for the experimental design of large-scale variable stiff-ness leveling pile raft foundation models in the field.Experimental results show that differential settlement sig-nificantly decreases,and the measured maximum differential settlement is less than the allowable value speci-fied in the specifications.It can be seen that using the above indicators for optimized design of pile foundation stiffness to reduce differential settlement has a significant effect on the control of differential settlement.

optimized design of pile foundation stiffness to reduce differential settlementstrengthening indexweakening indexdesign principlepile foundation

王涛、薛锐、褚卓、王旭

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建筑安全与环境国家重点实验室,北京 100013

中国建筑科学研究院有限公司地基基础研究所,北京 100013

中建一局集团建设发展有限公司,北京 100102

变刚度调平设计 强化指数 弱化指数 设计原则 桩基础

"十二五"国家科技支撑计划资助项目住房和城乡建设部课题资助项目住房和城乡建设部课题资助项目北京市自然科学基金资助项目

2012BAJ07B012020-K-1222021-K-0818192050

2024

10.3969/j.issn.1001-0505.2024.05.017

东南大学学报(自然科学版)
东南大学

东南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.989
ISSN：1001-0505
年,卷(期)：2024.54(5)