STUDY ON DISTURBANCE OF SOIL SQUEEZING BY STATIC DRILLING GROUNDED PILE

At present, there is still a lack of theoretical analysis on the application of green static drilling rooted pile technology in the vicinity of subway or sensitive buildings. Based on the construction characteristics of static drilling rooted pile, the physical model of disturbance analysis and basic assumptions are given. Then, based on the theory of circular hole expansion, the stress and strain of soil around pile caused by pile planting construction are derived, and the relationship between the limit reaming pressure and the plastic zone range is established in combination with continuous conditions. On the basis of the comparison between theory and actual measurement, the reliability of the method is tested. The results show that: compared with the traditional prefabricated pile construction method, the limit reaming pressure of pile planting is reduced by 48%, and the influence range of soil plastic zone around pile is reduced by 57%. When the friction Angle and cohesiveness of cement soil on the side of pile are increased, the limit reaming pressure of pile construction is increased, and the range of disturbance plastic zone is reduced. The research results provide a theoretical basis for fine evaluation of disturbance effect of static drilling rooted pile construction.