嵌岩桩荷载传递函数及非线性桩刚度确定方法  

Method to obtain load transfer function and non-linear pile stiffness of rock socketed pile

作　　者：王明珉 刘攀 余冠民 朱立刚 WANG Mingmin;LIU Pan;YU Guanmin;ZHU Ligang(Arup,Shanghai 200092,China)

机构地区：[1]奥雅纳工程顾问,上海200092

出　　处：《建筑结构》2023年第23期46-50,共5页Building Structure

摘　　要：以桩基荷载传递理论为基础,结合杭州恒隆广场试桩静载荷试验数据,开展了深埋岩层钻孔灌注桩力学特性研究。分析了土层与岩层桩基侧阻力及岩层端阻力随荷载增加的演进过程和发展趋势,并建立了具有场地代表性的荷载传递函数组。研究表明,深埋岩层钻孔灌注桩适合采用荷载传递函数描述其单桩力学特性;通过选择合适的函数形式,可以根据试桩数据拟合得到同一场地不同岩土层的桩基荷载传递函数组;进而可建立不同位置、不同嵌岩深度桩基的桩顶荷载-位移曲线和桩顶荷载-桩刚度曲线。通过与实测结果对比,采用荷载传递法得到的桩刚度曲线与实测结果较为吻合,可用于计算群桩基础反力及嵌岩钻孔灌注桩的变刚度调平设计。Based on the pile load transfer theory and combined with the static load test data of trial piles of Hang Lung Plaza in Hangzhou,the study of mechanical characteristics of bored piles socketed into deep buried rocks was conducted.The evolution process and development trend of side friction resistance and rock end resistance with loads increasing were analyzed,and a group of representative load transfer functions with site characteristics was established.Research shows that load transfer functions are suitable for describing the single pile mechanical characteristics of bored pile which is socketed into deep buried rock;by selecting appropriate function forms,a group of load transfer functions which describes different rock and soil layers in the same site can be built by fitting on trial pile data,and then the pile top load-displacement curve and pile top load-pile stiffness curve can be established for piles at different positions and different depth of rock embedment.By comparing with the measured results,the pile stiffness curve obtained by the load transfer method are generally consistent with the measured results,hence those curves can be used to calculate the reaction force of pile group,and to carry out the variable rigidity design for balance settlement design of bored piles socketed into rocks.

关 键 词：嵌岩桩 荷载传递法 荷载传递函数 桩刚度 变刚度调平设计 

分 类 号：TU473.1[建筑科学—结构工程]