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simulation analysis for O-cell test of pile and the interaction of upper pile and lower pile

Journal of Harbin Institute of Technology(New series) 2009年第4期16卷 541-547页

作者：郑英杰张克绪张尔其 school of Civil Engineering Harbin Institute of Technology

In this paper,the soil-pile system of O-cell test of pile is simplified as an axi-symmetric *** using aggregation of quadrilateral isoparametric elements to simulate pile and soil,setting Goodman's elements between pile and soils,a method of numerical simulation analysis on O-cell test of pile is presented with the consideration of nonlinear mechanical behavior of soils and pile-soil *** method is applied to the analysis of a case of O-cell test of *** load-displacement curves and axial force curves of upper pile and lower pile obtained from the O-cell test of pile are fitted,and parameters of the mechanical model of soils and interface are *** results validate that the numerical simulation analysis method put forward in this paper is ***,the interaction and influence of upper pile and lower pile in the O-cell test are also studied with the *** result shows that if load box is located in a soil layer with fine mechanical behavior,the interaction of upper pile and lower pile in O-cell test can be ignored generally.

关键词： O-cell test of pile simulation analysis nonlinear behavior p-s curve interaction

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EXpERIMENTAL sTUDY ON WHOLE TREE VERTICAL TENsILE sTRENGTH

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International Journal of sediment Research 2004年第2期19卷 154-160页

作者： Lihua CHEN, Xinxiao YU and Dongsheng ZHANG prof., Doctor, College of soil and Water Conservation, Beijing Forestry University, E-mail: c_lihua@*** prof., Doctor, College of soil and Water Conservation, Beijing Forestry University, E-mail: yuxinxiao@*** postgraduate for doctorate, College of soil and Water Conservation, Beijing Forestry University College of soil and Water Conservation Beijing Forestry University

This paper studies the vertical tensile strength of whole tree roots under the same soil and landformconditions. The experiments show that the shape of a root system’s distribution affects the verticaltensile strength of roots. Rhododendron trees have horizontal root systems, so the whole roots werepulled out in the experiment process. populous purdomii has vertical roots, so the experimentcontinued quite a long time. Abies fabric has both vertical and horizontal main roots, so the p--scurve shows a multi--peak shape.

关键词： Vertical strain Root system configuration p-s curve

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