弧底梯形复合衬砌渠道冻胀破坏力学模型及其求解.PDF

第35卷第1期 水 利 水 电科 技 进 展 2015年1月 Vol.35 No.1 Advances in Science and Technology of Water Resources Jan. 2015 DOI:10.3880/ j.issn.1006 7647.2015.01.011 弧底梯形复合衬砌渠道冻胀破坏力学模型及其求解 郑摇 源,汤摇 骅,姜海波 (石河子大学水利建筑工程学院,新疆 石河子摇 832000) 摘要:针对弧底梯形断面渠道,考虑复合土工膜和渠基土壤的摩擦力,通过分析复合衬砌渠道的冻 胀破坏机理,指出弧底梯形复合衬砌渠道坡板可简化为在冻胀力、冻结力、摩擦力共同作用下的悬 臂梁,整个衬砌体属于压弯组合变形结构。 通过适当的假设和简化,建立了弧底梯形复合衬砌渠道 冻胀破坏力学模型,分别求出渠道坡板和弧形底板内力表达式,并对衬砌板的厚度进行验算。 对比 混凝土渠道,加入复合土工膜后,衬砌体产生允许范围内的冻胀位移量,使渠基土壤对衬砌体的有 效冻胀力和有效冻结力减小,改善了衬砌体本身的受力状态,起到防冻胀破坏的作用,揭示了复合 衬砌渠道防冻胀破坏的机理;对比梯形渠道,认为弧底梯形渠道坡板与底板整体结构性更强,反拱 作用明显,更有利于渠道的防冻胀破坏。 关键词:复合衬砌;弧底梯形断面渠道;冻胀破坏;力学模型;冻胀力 中图分类号:TV672摇 摇 摇 文献标志码:A摇 摇 摇 文章编号:1006 7647(2015)01 0061 06 Research on mechanics models of frost鄄heaving damage on composite lining trapezoidal canal with arc鄄bottom/ / ZHENGYuan,TANG Hua,JIANG Haibo(College of Water Conservancy andArchitecture Engineering,Shihezi University, Shihezi832000,China) Abstract:The composite lining canal is a kind of lining form which combine compound geomembrane and concrete lining structure. In order to improve the performance of the canal of anti鄄freezing expansion damage, aimed at the lining trapezoidal canal with arc鄄bottom, the friction of the compound geomembrane and the concrete lining structure are considered. By analyzing the damage mechanism of frost鄄heaving on the concrete lining of the channel with arc鄄bottom section,it has been indicated that the slope lining is seen as a cantilever beam under the function of frost鄄heaving force, frozen force and thefriction. Further,ithasbeenfoundthattheslopeliningplateandthebottomliningplatearecombined deformation members under the loads of bending and compressing. The mechanics models of frost鄄heaving damage of