| 摘要: |
| 【目的】 推导出适宜于季节性冻土区弧脚梯形衬砌渠道的断面形式。【方法】 根据冻土力学、水力学、工程力学理论，分析弧脚梯形渠道砼衬砌冻胀破坏机理及破坏特征，指出对季节性冻土区弧脚梯形渠道最优断面的设计，要从结构抗冻胀和水力学两方面考虑，以砼衬砌体同时满足水力最佳及抗冻胀性能最优为原则，对弧脚梯形渠道断面的最优形式进行推导。【结果】 根据工程实践中常用的取值范围，在综合考虑水力最佳断面及砼衬砌板抗冻胀性能最优的基础上，得到最优断面的几何参数，即水力最佳和抗冻胀性能最优的弧脚梯形最优断面为：渠底宽是设计水深的0.53倍，坡脚圆弧半径是设计水深的0.3倍，坡脚圆弧中心角即边坡板的倾角为51°。【结论】 此断面形式不但能适应季节性冻土区渠道防渗抗冻胀工程的实践要求，而且便于机械化施工。 |
| 关键词: 弧脚梯形断面；衬砌渠道 冻胀破坏 水力最佳断面 受力分析 |
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| 基金项目:国家“863”高新技术研究与发展计划项目（2002AA62Z3191）；国家冻土工程重点实验室基金项目（9901） |
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| Analysis of anti-frost heaving and reasonable hydraulic section of the channel in trapezoidal section with curved slop toe |
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LU Qin,WANG Zheng-zhong,LIU Ji-liang,LIU Xu-dong
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| Abstract: |
| 【Objective】 The research was conducted to find out the section form of the trapezoidal section with curved slop toe of the concrete lining channel,which is suitable in the seasonally frozen area.【Method】 Based on the theory of soil mechanics，hydraulics，engineering mechanics,we analyzed the frost heaving destruction and destructive character of concrete lining channel in trapezoidal section with curved slop toe,pointed out that structure anti-frost heaving and hydraulics must be considered,because when designing the best trapezoidal section with curved slop toe in seasonally frozen area,it is the rule that the concrete lining structure must be the best hydraulic structure and have the best capability of anti-frost heaving.At the same time,this paper deduced the best form of the trapezoidal section with curved slop toe.【Result】 based on the common used area of the numeric value,the geometrical parameter of the reasonable cross section is obtained.【Conclusion】 This section is more suitable for the anti-frost demand and convenient for mechanic construction. |
| Key words: trapezoidal section with curved slop toe concrete lining channel frost heaving destruction the best hydraulic section press analysis |
