（中国建筑科学研究院 北京 100013）
【提要】 根据某深基坑工程实测的支护桩桩身钢筋应力，分析了在不同工况下支护桩的内力特性及其
变化规律，揭示了冠梁与支护桩之间存在的协同作用。根据实测应力推求的弯矩与按理论计算的弯矩对比发现，实测求得的弯矩与采用弹性支点法计算的结果吻合较好，与极限平衡法计算的结果差别较大。
【关键词】 深基坑 支护桩 冠梁 现场测试 内力 弯矩
Field Test Research on Internal Force of Retaining Pile for Deep Excavation/Wang Jianjun, Huang Qiang(China Academy of Building Research, Beijing 100013，China)
Abstract:Based on the measured reinforcement stress in the retaining pile for a certain d
eep excavation, behavior and changing pattern of internal force are studied under different conditions. Then cooperative action between top beam and retaining pile is disclosed. Contrastive analysis of bending moments of retaining pile shows that the results by using the measured rebar stresses coincide with those calculated through elastic fulcrum method, while are quite different from those obtained by limit equilibrium method.
Keywords:deep excavation; retaining pile; top beam; field test; internal force; bending moment