Abstract: When the pile foundation in subway substation is designed,if the construction sequence of substation pile foundation and subway tunnel cannot be determined,the influence of different construction sequence on substation and subway tunnel should be considered. Taking 110kV Sheng’an substation in Wuxi metro as the example,on the condition that the construction sequence of substation pile foundation and subway tunnel cannot be determined,the influence of pre-stressed high strength concrete pipe pile ( PHC pipe pile) and bored pile on the structure of substation and tunnel under different construction sequence is compared,the bored pile is selected for pile foundation in substation. Based on the characteristics that the engineering geological feature and the equipment are sensitive to settlement,the pile raft foundation is adopted.

Key words: PHC pipe pile, bored pile, compaction effect, bearing capacity

摘要： 在地铁变电站桩基设计时,若不能确定变电站桩基施工和地铁隧道的施工顺序,就需考虑不同施工顺序下对变电站和隧道结构的影响。文中以无锡地铁110 k V盛岸变电站为例,在设计时,未能确定地铁变电站桩基和地铁隧道的施工顺序的情况下,通过对比预应力高强度混凝土管桩(PHC管桩)与钻孔灌注桩,在不同施工顺序下对变电站和隧道结构的影响,确定了桩基施工方法采用钻孔灌注桩;并结合工程地质特征和设备对沉降敏感的特点,确定桩基采用桩筏基础。

关键词:  , PHC管桩, 钻孔灌注桩, 挤土效应, 承载力