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根土相互作用关系对树干振动特性的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2013年06期
Page:
77-81
Column:
研究论文
publishdate:
2013-11-27

Article Info:/Info

Title:
Effects of root-soil interaction on trunk vibration characteristics
Article ID:
1000-2006(2013)06-0077-05
Author(s):
TAO Siwei ZHAO Dong*
School of Engineering, Beijing Forestry University, Beijing 100083, China
Keywords:
trunk vibration root-soil stiffness connection root-soil friction fixed end numerical simulation
Classification number :
Q947.6
DOI:
10.3969/j.issn.1000-2006.2013.06.016
Document Code:
A
Abstract:
In order to explore the mechanical relationship between roots and soil when trees vibrated under external loads, and then analyze the lodging-resistant mechanism of roots, this study measured the natural frequency of four Chinese white poplars grown in nursery of Beijing Forestry University. Trunk vibration tests were conducted in three different circumstances respectively, which include in-situ growth and root-soil friction and fixed end. The root-soil stiffness connection model, root-soil friction model and fixed end constrained model had been constructed to simulate three circumstances mentioned above. After that the natural frequency of the models had been calculated. Based on a comparison between the simulation values and the experimental values, the effect of interaction between roots and soil on vibration properties of trees had been analyzed. The results show that:(1)the natural frequency of trees in three different root-soil interaction constrained circumstances had obvious difference, the size order was “fixed end>in-situ growth>root-soil friction”.(2)the size order of three finite element models was “fixed end>root-soil stiffness connection>root-soil friction”, it was in accordance with the test result. Root-soil stiffness connection model which was used to simulate trees in-situ was more accurate than other models;(3)Along with the increasing of the external force, the influence of soil on tree vibration properties enhanced gradually.

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Last Update: 2013-11-30