悬臂式支护桩内力分布规律试验研究  

Field test research on distribution characteristics of internal force for cantilever retaining piles

作　　者：黄雪峰[1,2] 陈帅强 马龙[1] 

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]后勤工程学院建筑工程系,重庆400041

出　　处：《四川建筑科学研究》2015年第1期172-175,共4页Sichuan Building Science

摘　　要：通过对西宁火车站深基坑支护桩内力进行现场实测,研究分析了不同工况下悬臂式支护桩的受力特性及其变化规律。监测结果表明,悬臂式支护桩桩身钢筋应力实测值远小于钢筋强度设计值;冠梁与支护桩有明显的协同作用,使得桩顶部分受力特性完全不同于上端自由的直立杆件;支护桩嵌固深度过长,并不能改善支护桩的受力特性;实测桩身最大弯矩位于基坑底面及其以上1.5 m的区域内,小于理论计算弯矩。本次测试结果可为悬臂式支护桩的设计提供可靠的依据。Through the measured internal force of the retaining pile for the deep excavation in Xining railway station, behavior and changing pattern of internal force are studied under different conditions. The test results suggested that the measured reinforcement stress of cantilever retaining piles should be less than designed value. There is obviously synergy between the capping beam and the retaining piles, which makes the behavior of the retaining piles under lateral pressure is quite different from that of the upright free head shaft. The behavior of retaining piles can＇t be improved though deepening the embedded depth of the retaining piles. The measured maximum moment of the retaining piles he in the area between the foundation pit bottom and over 1.5 m, and its value is less than the theoretical value. This test results can provide reliable basis for the design of cantilever retaining piles.

关 键 词：深基坑 支护桩 内力 弯矩 

分 类 号：TU473[建筑科学—结构工程]