摘要
针对自平衡试桩简化转换方法和传统的自平衡试桩精确转换方法的不足进行了改进,提出了基于桩身位移测量的确定试桩极限承载力的自平衡试桩测试方法,推导了基于桩身位移测量的自平衡试桩精确转换公式。结合工程实例,确定相关参数的合理取值范围。由于使上段桩中点附近桩身的位移与平衡箱下侧点向下的位移相等,也与等效受压上段桩的平均位移相等,考虑了平均位移的协调性,减少了转换系数的离散性,加上桩身位移测量的准确性比桩身应变测量要高,因而文中的方法更加合理、可靠和实用。
According to the disadvantages of simplified conversion method and the traditional accurate conversion methods used in the self-balancing pile, they are improved in the paper, and the trial method determining the self-balan- cing pile＇s ultimate bearing capacity based on the pile displacement measurement is put forward, the accurate conversion formula of self-balancing pile based on the pile displacement measurement is derived. Combined with the engineering practice, the reasonable value range of related parameters are determined. Because it is set the displacement near the mid- dle of upper pile equal to the downward displacement of the inferolateral point of balance box, and equal to the average displacement of the equivalent compression on the upper pile, and the coordination of average displacement is considered, the discreteness of conversion coefficient are reduced, and pile displacement measurement is more accurate than pile strain measurement, so the proposed method is more reasonable, reliable and practical.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2013年第8期103-107,共5页
Journal of Wuhan University of Technology
基金
国家自然科学基金(51278216)
关键词
自平衡试桩
极限承载力
精确转换法
桩身位移测量
位移协调
self-balancing pile
ultimate bearing capacity
accurate conversion methods
pile displacement meas- urement
displacement coordination
