路堤荷载下双向增强体复合地基桩土应力比计算  

CALCULATION OF PILE-SOIL STRESS RATIO OF TWO-DIRECTION REINFORCEMENT COMPOSITE FOUNDATION UNDER EMBANKMENT LOADS

作　　者：赵明华[1] 刘猛[1] 龙军[1] 顾美湘[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《岩石力学与工程学报》2012年第A01期3286-3290,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51078138)

摘　　要：根据路堤–垫层–桩土加固区相互作用的特点,将加筋垫层视为弹性薄板,将桩与桩间土体视为刚度不同的弹簧体系,基于弹性地基上的小挠度薄板理论模拟加筋垫层的挠曲变形,同时考虑路堤土拱效应,建立路堤荷载下双向增强体复合地基桩土应力比的计算模型,根据应力与位移的连续性条件,求解桩土应力比。最后将工程实测结果与计算结果进行对比,二者吻合较好,表明该方法的可行性。研究成果能够为工程实践提供参考。According to the characteristics of interaction among embankment, reinforced cushion and pile-soil reinforced area, the reinforced cushion is regarded as an elastic thin plate, and the soil and pile are simplified as a series of springs with different rigidities. Based on the theory of small deflection thin plate on elastic foundation, with consideration of soil arching effect in the embankment, the deflection deformation of the cushion is simulated. The calculation model for two-direction reinforcement composite foundation under embankment loads is established. Based on the model and the continuous conditions of stresses and deformations, the solution to pile-soil stress ratio can be obtained. Finally, the result calculated by the proposed method is compared with the observed one of a project. It is shown that the calculated result is close to the observed one. It verifies the feasibility of the proposed method and the results can larovide references for engineering practice.

关 键 词：桩基础 双向增强体 土拱效应 弹性薄板 桩土应力比 

分 类 号：TU473[建筑科学—结构工程]