在湿陷性黄土地区修建要求较高客运专线必须要消除湿陷性和改善土体各项力学指标。以新建兰州西客站作为试验工点,采用水泥土柱锤冲扩桩处理地基。结果表明:水泥土柱锤冲扩桩复合地基能够满足地基承载力的要求,消除黄土湿陷性,降低桩间土的压缩系数达到50%以上,并提高桩间土的干密度达到22.5%以上。 In the collapsible loess area requires the construction of higher passenger dedicated line must be to eliminate collapsible and improve soil mechanics indicators. Lanzhou West Railway Station as a pilot test site, the use of cement soil column hammer piling pile foundation treatment. The results show that cement - soil column hammer - expanded piles composite foundation can meet the requirement of foundation bearing capacity, eliminate the collapsibility of loess, reduce the compressibility of soil between piles to more than 50%, and increase the dry density of soil between piles to more than 22.5%.