北京市109中学人行天桥桩基托换有限元分析

FINITE ELEMENT ANALYSIS OF PILE FOUNDATION UNDERPINNING OF THE 109TH HIGH SCHOOL'S PEDESTRIAN OVERBRIDGE IN BEIJING

北京地铁天坛东门站穿越109中学人行天桥桩基础,采用地面扩大承台并施作新桩与既有桩共同承担上部荷载,在洞内采用直接截桩的桩基托换方案,就此方案对其施工过程进行了数值模拟,通过数据整理与分析,总结出桩基托换引起的承台沉降规律,并根据计算结果与实测结果的比较证明了该托换方案的合理性、可行性。

Based on the Tiantan East-station of Beijing Subway which goes through the pile foundation of the 109th high school's pedestrian overbridge,the underpinning scheme that the newly built pile and the old pile support the upper load is constituted,and in the scheme truncating the pile in the tunnel is also determined. Then the construction process is simulated by FEM software,by means of the data reduction and analysis,summarize the rule of the settlement of cap that is produced by pile foundation underpinning.At last,it is proved that this underpinning scheme is rational and feasible by the comparison of the imitation result and the measured result.