负摩阻力作用下基桩竖向承载特性分析

ombining with practical engineering, this paper established a single pile numerical model using FLAC3D to simulate pile foundation stress and displacement field under the action of preloading. Respectively using numerical simulation method and specification method to calculate the ultimate bearing resistance of individual pile and the negative skin friction resistance of pile, both calculated results were coincident. The numerical simulation got pile top draft settlement under five different kinds of working condition, and simulated the static test under preloading and non preloading. Studies have shown that the pile top haul down settlement and the pile stack were relevant to the order of pile top load, The pile top final settlement was not pile top settlement's simple superposition which was generated by solely action of pile top load and the pile stack; The worst working condition was stacking large load to haven been imposed pile top load pile, it should be avoid in engineering. It should be highly valued if ultimate bearing capacity of single pile was probably much larger, which was gained by first load and then according to the existing pile foundation inspection methods.