Abstract:  Pressure pumped CFG pile by continuous auger drilling is a new technology of CFG pile composite foundation.However,there appear a series of environmental geotechnical engineering problems and pile quality problems when this technology is applied and popularized in Zhengzhou and its peripheral regions.Therefore,it is urgent to study the mechanism and causes of the above problems as well as the solution to the problems and to assess their adaptation.Change of pore water pressure is the precursor of change of soil intensity.By burying pore water pressure gauges at the side of the piles,the variation discipline of the pore water pressure in saturated powder soil around piles is studied,and the mechanism of deformation displacement of soil body around piles caused by constructions during the process of construction of the pressure pumped CFG pile by continuous auger drilling is discussed.So it provides an important basis for deep analyses of the environmental and geotechnical engineering problems caused in construction.Effective measures should be taken to avoid engineering accidents.