梯形复合衬砌渠道冻胀破坏力学模型研究

Research of Mechanics Models of Frost Heaving Damage of Composite Lining Trapezoidal Canal

近年来复合土工膜与混凝土板相结合的复合衬砌防渗渠道得到了广泛应用。复合土工膜是一种薄型、连续、柔软的防渗材料,其防渗特性已有大量研究成果,但对复提合衬砌渠道的力学特性还缺乏研究。针对梯形断面渠道,建立了复合土工膜混凝土衬砌渠道的冻胀破坏力学模型,提出了衬砌板内力表达式及厚度验算公式。分析梯形复合衬砌渠道冻胀破坏的影响因素,结果表明,加入复合土工膜后削减了冻土对衬砌板的切向约束力,能起到防冻胀破坏的作用。

The composite lining seepage control canals combined with compound geomenbrane and concrete plate are widely used in recent years. As a kind of seepage control material which is thin,continuity and soft,the research of seepage control characteristics of compound geomenbrane has obtained many achievements. But the mechanics characteristics of the composite lining canals also lack of research. In this paper,the mechanics models of frost heaving damage of composite lining canal combined with compound geomenbrane and concrete plate were established for the trape-zoidal section canal,the internal force of the lining plates are solved and the thickness of the concrete plates were checked. The influencing factors of frost heaving damage of composite lining trapezoidal canal were analyzed. The results indicate that the tangential force of constraint of the lining plate is decreased by augment composite geomembrane. So it can play the role of anti-freezing expansion damage.