极限状态及变形量控制下自平衡试桩承载力分析

结合卡纳夫里三桥S10试桩的自平衡试验，对强度极限状态、极端事件极限状态下的基桩承载力进行了分析，并与按桩顶变形量控制的承载力进行对比，说明基于结构受力分析的变形量控制与极限状态下的极限承载力结果相接近；基桩极限承载力的桩顶沉降控制值应根据结构的极限状态分析确定，只要结构相邻基础沉降差引起的结构内力控制在设计范围内，就有利于超长桩承载力的发挥。介绍了确定桩身刚度的计算方法，研究表明：所提方法比传统的刚度估算法更为准确、实用。

Bearing capacity analysis of self-balanced load test pile under the control of limit state and deformation

Based on the self-balanced test of S10 pile in the Third Karnaphuli Bridge, the ultimate bearing capacity under extreme event and limit state is analyzed; and it is compared with the bearing capacity controlled by pile deformation. The results are similar between deformation control under structure stress analysis and ultimate bearing capacity under limit state, the limit top settlement for the ultimate bearing capacity should be determined according to the limit state of structure, which is helpful for playing the bearing capacity of super-long pile as long as structure internal force caused by settlement deference can be controlled in design range. The calculation method of determining the pile stiffness is introduced, which is more accurate and useful than traditional one.