Study on Construction Technology of Drainage Prestressed Pipe Pile for Foundation Composed of Alternative Soft and Hard Soil Layers

The soft soil foundation is widely distributed in our country, with the features of high moisture content, high compressibility, low strength and poor water permeability, among which the geological condition of alternate soft and hard soil layers is also common, and the constructions built on such foundation always encounter the problems of excessive total subsidence volume, obvious subsidence difference, later subsidence beyond limits, and inadequate carrying capacity, which would affect the normal use and safety of the constructions. Therefore, this paper developed an innovative construction technology of drainage prestressed pipe pile for foundation composed of alternate soft and hard soil layers, and introduced the process principles, scope of application, technical features, process flow and operating points of the technology.