桩基础变刚度调平设计量化控制指标研究  

Quantitative study on control indexes of optimized design of pile foundation stiffness to reduce differential settlement

作　　者：王涛 薛锐 褚卓 王旭 Wang Tao;Xue Rui;Chu Zhuo;Wang Xu(State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;Foundation Institute of China Academy of Building Research,Beijing 100013,China;China Construction First Group Construction&Development Co.,Ltd.,Beijing 100102,China)

机构地区：[1]建筑安全与环境国家重点实验室,北京100013 [2]中国建筑科学研究院有限公司地基基础研究所,北京100013 [3]中建一局集团建设发展有限公司,北京100102

出　　处：《东南大学学报（自然科学版）》2024年第5期1208-1215,共8页Journal of Southeast University：Natural Science Edition

基　　金：“十二五”国家科技支撑计划资助项目(2012BAJ07B01);住房和城乡建设部课题资助项目(2020-K-122,2021-K-081);北京市自然科学基金资助项目(8192050).

摘　　要：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<λ_(s)<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.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 summarized,and the calculation method for optimized design of pile foundation stiffness to reduce differential settlement and principles were proposed.Quantitative analysis and research on specific control indicators for variable stiffness leveling were conducted based on the results of large-scale indoor model experiments,and the reinforcement index was given at 1<λ_(s)<1.30.The standard settlement ratio and standard stiffness ratio are roughly linearly related to strengthening index within the range 1<λ_(s)<1.30.It is proposed that the strengthening 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 stiffness leveling pile raft foundation models in the field.Experimental results show that differential settlement significantly decreases,and the measured maximum differential settlement is less than the allowable value specified 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.

关 键 词：变刚度调平设计 强化指数 弱化指数 设计原则 桩基础 

分 类 号：TD853.34[矿业工程—金属矿开采]