| Xi'an fissure is a unique city geological disaster, and it bring huge economy losses to city construction of xi'an. It is since 20th century 70s the mid-end era organiced investygation to xi'an fissure, the seismic department, the terra mine department, the geography department, the investigation department and universities of our country has got abundant accomplishments in fissure disaster reduction. But there are very little research datas about the effect of fissure settlement to pile bahavior and the design method and theory of pile. So to carry out the research of fissure settlement to stress and strain field of pile and soil around pile and behavior of soil around pile has very importment academic research and project application meaning, consider of recently the fast department of high-rise buildings and the fashion of concrete friction pile in loess soil field.The artic against on the major friction pile in Xi'an clay field, consider of the affect of fissure activities to pile behavior, proceed the analysis of behavior of pile and soil around pile.The artic present a new calculation idea, that is in conformity to the estimation settlement curve of furture fifth years act on superstructure, through the change of load on pile bolck to externalization afect of fissure settlement to pile and soil around pile behavior. Primary use the calculation of numerical simulation, applicate the ANSYS finite element software establish consider contact and don't consider contact single-deck soil models, don't consider contact three-layer soil models of little high-rise frame construction, and compare the calculation results of common field and 14m, 9m 5m three monitoring spots in fissure influence area, and present a feasibility theory method about avoidance distance according to the stress field distribute of soil around pile, which provide a theoretical basis for the design of pile in fissure influence area and the determination of avoidance distance.
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