摘要
通过对U形断面渠道的衬砌冻胀破坏特征、机理的分析,指出最优U形断面应是从结构和水力两方面考虑的,通过合理的假设,建立简单的力学模型,以衬砌体结构抗冻胀性能最优及水力最佳为原则,最终推出最优的U形渠道断面参数弧底圆心角和圆弧上部直线段的长度。同时,指出了U形衬砌渠道的冻胀力分析可以表达成最大冻结力的函数,而最大冻结力是反映土质、负温及水分状况的综合指标,只要根据经验或实验确定了最大冻结力,再结合渠道几何要素及衬砌材料的力学指标和衬砌结构的有关参数,就能计算出最优U形断面的参数,使问题简单化、定量化。该计算方法的结果表明符合工程实践的要求,而且安全合理,使用简单。
Thorough analysis of the damage mechanism of frost heaving on the concrete lining of the U-shape canal, this article points out that the optimal U-shaped cross section should be considered the structural and hydraulic. Through reasonable assumptions, and establishes a simple mechanical model. Optimal parameters of the U-shaped channel section, which are introduced by the principles of the lining of the optimal anti-frost heave structure and the best hydraulic. Finally, it obtains parameters about Arc bottom of central angle and straight line segment. Analysis of the damage mechanism of frost heaving on the concrete lining of the U-shape canal and they all can be expressed as the function of the adfreezing forces. Moreover the adfreezing forces is a comprehensive reflection of soil quality, negative temperature and the status of moisture, there by optimal parameters of the U-shaped channel section can be solved provided that adfreezing forces is determined according to the practical experience or experiment and consideration of the channel geometry essential factor and lining material mechanicstarget and parameters of lining work structure. Finally, its result shows safety, rationality, simpleness.
出处
《节水灌溉》
北大核心
2008年第2期36-38,45,共4页
Water Saving Irrigation
关键词
U形衬砌渠道
冻胀
水力最佳断面
受力分析
U-shape canal with concrete lining
freezing
hydraulic best section
analysis forces
