特高压输电线路支盘桩群桩受力性能及经济性分析

通过有限元数值模拟,研究了支盘桩群桩在竖向荷载作用及竖向和水平荷载共同作用下基桩荷载-位移曲线、桩身应力分布、桩身轴力变化规律及桩间土体受力情况等,并结合具体工程,对支盘桩的技术经济性进行了分析.结果表明:支盘桩群桩在竖向和水平作用下的受力特点与单独承受竖向荷载作用时有所不同;同等条件下,相对于普通等径灌注桩,挤扩支盘桩群桩基础的设计尺寸、材料用量、施工造价及工期均有减少,具有较大的经济效益.

Mechanics Performance and Economic in Squeezed Branch Pile-Group of UHV Transmission Line

The study on the load displacement curve,the stress distribution of pile,the axial force variation law of pile,and stress situation of soil between piles under vertical load and vertical and horizontal load was carried out through the field static load test and the finite element numerical simulation.And the technical and economic performance of squeezed branch pile was analyzed combined with the specific engineering examples.The results show that the mechanical characteristics of group-pile under vertical and horizontal load are different from that of group-pile under vertical load.Under the same conditions,the design size,material consumption,construction cost and construction cost and duration are decreased compared with the ordinary equal diameter pile,which have great economic benefits.