砂土体-桩在基坑开挖过程中变形特性研究

深基坑开挖过程中土与支护结构相互作用是岩土工程课题中一个难点.此文分析深基坑支护结构在抵抗坑外砂土压力时的变形规律,基坑变形对土压力的影响；总结国内外已取得的经验成果,以北京地铁房山线大葆台站为例,探讨深基坑砂土体与排桩支护结构变形特性；利用有限元计算软件PLAXIS对深基坑进行开挖与支护模拟,通过计算,得出不同开挖阶段围护结构水平变形和地表沉降规律,为工程设计与施工提供参考,对类似问题的求解具有较好的借鉴意义.

Study on Deformation Characteristics of Sand- pile During Foundation Pit Excavation

Interaction of pile and soil is a complicated engineering problem,sand is a cohesionless soil.In domestic and foreign,research about interaction of pile and sand even fewer.This paper has analyzed the regular rules of deformation of excavation bracing frame when resists the sand pressure from out of excavation,and the influences from deformation to sand pressure;explored the deformation behaviors between the row piles and sand,take the Dabaotai station of Fangshan Line of Beijing Subway as an example and on the basis of analysis on lots of relevant researeh at home and abroad,In order to study retaining structure and soil interaction in excavation,monitoring data(especially deformation of the wall,settlement of ground surface and earth pressure etc.) in the process of excavating and supporting was analyzed,And three-dimensional numerical method was used in simulating;Applied with the PLAXIS,a sort of huge finite element calculation software,the numerical modeling during the actual excavation proeess and bracing frame on this test have been done.