（中南林业科技大学土木建筑与力学学院  长沙 411201）
［提要］  深基坑开挖过程中，由于土体内应力重新分配，导致支护桩的内力也产生重新分布，影响基坑及周围建筑的安全。建立了深开挖条件下基坑简化分析模型，采用非线性有限元法，计算了动荷载作用下支护桩的弯矩和剪力，并对考虑和未考虑动荷载时的内力进行了对比分析，得出了具有工程意义的结论。
［关键词］  深基坑开挖  支护桩  内力重分布  动荷载
Analysis on Internal Force Redistribution of Piles Considering Dynamic Load/Duan Shaowei(College of Civil Architecture and Mechanic, Central South University of Forestry and Technology，Changsha 411201, China)
Abstract:In the process of excavation of deep foundation pits, the internal force of piles will be changed due to soils stress new distribution, so the security should be considered. The simplified analysis model of foundation pits is established by using nonlinear FEM, and the bend moment and shearing force are calculated. After making a comparison between internal force considering dynamic load or not, some valuable conclusions for engineering are drawn.
Keywords:excavations of deep foundation pits; supporting pile; internal force; dynamic load
*湖南省自然科学基金项目(06JJ50080)；湖南省科技计划项目(04SK3070)；中南林业科技大学青年科学研究基金项目(05026B)。