Study About Influence Of Strong Weathering Intercalated Thickness Of Batholith On Performance Of Pile-Raft Foundation

The pile-raft foundation has good entirety, vertical bearing capacity of the foundation settlement, small, adjust the uneven settlement, and can withstand wind load or the seismic load caused by level, resistive overturning ability. In soft soil area has become an important high-rise building foundation forms. So, study on pile-raft foundations of high-rise buildings has great society benefit and economical domino offect. In this paper, the behavior and influence of pile-raft foundation in batholith with severely-weathered intercalated layer are studied systematically and deeply.(1) Theory of computation on Winkler foundation model is introduced in detail, deducted the relationship of the thickness of severely-weathered intercalated layer in pile tip resistant layer and the vertical displacement,internal force of raft. Combined with the engineering practice, gaining the influence of the vertical displacement and internal force of raft. The outcome indicates: with the increased thickness of severely-weathered intercalated layer in batholith, the vertical displacement and the shearing force in border of the raft is increased linearly, the moment,the shearing force in inter and the moment in border is decreased;(2) The pile-raft foundation is simplified to be four times of equilibrium. Using Structural mechanics theory, deducted the relationship of the thickness of severely-weathered intercalated layer in batholith and the internal force of raft. The results calculated by Structural mechanics theory and Winkler foundation model are generally conformed;(3)Using FLAC^3D to imitate the pile-raft foundation analyzed the influence on the settlement of pile-raft foundation,internal force of raft and the thickness of severely-weathered intercalated layer in batholith. The results calculated by numerical simulation and theoretical analysis are generally conformed;(4) Field test data will be calculated with the theoretical and numerical simulation results were compared. The results calculated by theoretical analysis,numerical simulation and field test are generally conformed. It says that an analytical method in this paper is applicability.This initial exploratory research results of this paper hold great guiding significance and enrich theoretic research of pile-raft foundation.