农业工程学报2011，Vol.27Issue(1)：29-35,7.DOI:10.3969/j.issn.1002-6819.2011.01.005
基于数值模拟的双层薄膜防渗衬砌渠道抗冻胀机理探讨
Exploration on anti-frost heave mechanism of lining canal with double films based on computer simulation
摘要
Abstract
To prevent frost heaving damage, double plastic films can be laid under lining plate which can unbind adfreezing constraint between lining and frozen soil. This kind of canal is just called lining canal with double films. In order to explore its effect and mechanism, finite element software ADINA was applied to simulate canal heaving process and the rules of stresses and deformations of lining plate were also analyzed. Compared with the normal lining canal,lining canal with double films can get an obvious effect of anti-frost heave, because it can make frost heaving distribution and force more uniform to reform stress states remarkably. For mean square deviation and extremum of tangential adfreezing force on shady slope, bottom and sunny slope, the decreasing amplitude is greater than that of normal frost-heave force. And this fact demonstrates that lining canal with double films can weaken the constraint to make frost heaving distribution uniform and reform stress states, which is the mechanism of anti-frost heave. Compared with trapezoidal section, the trapezoidal with arc-bottom is suitable section for lining canal with double films. And its elastic joints between arc-bottom plate and that on slope should be managed elaborately, or integral structure should be applied to avoid sliding instability of plates on slope. The results can provide scientific references for further research and extended application of lining canal with double films.关键词
数值分析/渠道衬砌/计算机模拟/双层薄膜防渗衬砌渠道/抗冻胀机理Key words
numerical analysis/ canal linings/ computer simulation/ lining canal with double films/ anti-frost heave mechanism分类
农业科技引用本文复制引用
刘旭东,王正中,闫长城,李甲林..基于数值模拟的双层薄膜防渗衬砌渠道抗冻胀机理探讨[J].农业工程学报,2011,27(1):29-35,7.基金项目
国家"863"计划(2002AA62Z3191) （2002AA62Z3191）
国家冻土工程重点试验室基金资助项目(9901) （9901）
