摘要
通过对具有完整桩侧阻力测试资料的153根试验桩的分析,将在使用荷载(桩基承载力特征值)下诸多复杂侧阻分布形式分类概化为蒜头形、凹谷形、锥头形、正梯形4种,同时对基桩桩端平面下投影截面内竖向附加应力进行均化,并对受之影响基桩在投影截面内竖向附加应力进行均化处理。依据概化和均化成果进一步提出桩基均化附加应力分层总和法计算常规桩基和复合桩基沉降的具体方法和细则。通过6组室内大比例尺模型试验和8项应用此法的实际工程案例测试、分析、计算表明,推荐方法计算桩基沉降值在不经修正的情况下,与工程实测值较为接近。
Based on the test results of 153 field test piles,various complicated and different shaft resistance distributions under working loads(characteristic values of bearing capacity of piles)are generalized into four types:regular trapezoid,cone head,garlic head and concave valley,and the additional stress coefficient within the projection range of pile section is homogenized.At the same time,the additional stress coefficient of the affected piles in the range of section projection is homogenized.Based on this,the concrete steps and detailed rules for calculating the settlement of conventional and composite pile foundations by the method of layered summation for the homogenized additional stress of pile foundations are put forward.Through 6 groups of model tests and 8 practical engineering cases,it is shown that the settlement value of pile foundations calculated by the proposed method is close to the measured one without correction.
作者
王涛
赵志鹏
褚卓
王旭
WANG Tao;ZHAO Zhipeng;CHU Zhuo;WANG Xu(State Key Laboratory of Building Safety and Built Environment,Beijing 100013,China;China Academy of Building Research Foundation Institute,Beijing 100013,China;Beijing Engineering Technology Research Center of Foundation and City Underground Space Development and Utilization,Beijing 100013,China;National Engineering Research Center of Building Technology,Beijing 100013,China;China Construction First Group Construction&Development Co.,Ltd.,Beijing 100102,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2023年第11期2227-2237,共11页
Chinese Journal of Geotechnical Engineering
基金
住房和城乡建设部课题(2020-K-122,2021-K-081)
北京市自然科学基金项目(8192050)
国家科技支撑计划项目(2012BAJ07B01)。
关键词
附加应力系数
基桩均化附加应力
概化
沉降计算
变刚度调平设计
additional stress coefficient
additional stress of pile homogenization
conceptualization
settlement calculation
optimized design of pile foundation stiffness to reduce differential settlement
