堤坝冻胀防护方法研究

Research on the protection method for dam frost heave

在我国高纬度寒冷地区,各类水工建筑物常常受到冰荷载的不同程度的冻害,其中冰层温度膨胀力是造成建筑物破坏的主要荷载之一。冰层温度升高体积膨胀,而膨胀受到建筑物的约束,则冰层内部会产生温度膨胀力,很可能影响水工建筑物的正常运行,导致人力和物力的损失。本文提出了一种梯形槽式堤坝防护型式,通过梯形凹槽将原有的静冰压力分散,从而减少静冰压力对建筑物的冻害损伤程度,延长使用寿命,提高经济效益。最后通过防护效果检验发现:增大防护板梯形角,适当增加防护板厚度以及调整下梯形面长度和各梯形面之间比例都可以减少静冰压力,达到良好的防护效果。

In the cold regions of high latitudes in our country,all kinds of hydraulic structures are often subjected to different degrees of freezing damage caused by ice load,among which the temperature expansion force of ice layer is one of the main loads causing damage to buildings.If the temperature of the ice layer rises and the volume expands,and the expansion is restricted by the building,the temperature expansion force will be generated inside the ice layer,which is likely to affect the normal operation of the hydraulic construction and lead to the loss of manpower and material resources.In this paper,a protection type of dam with trapezoidal grooves for anti-frost heave was proposed,which dispersed the original static ice pressure through trapezoidal grooves,thus reducing the frost damage degree of the building caused by the static ice pressure,prolonging the service life and improving the economic benefits.Finally,through the test of protective effect,it was found that:increasing the trapezoidal angle of the protective plate,increasing appropriately the thickness of the protective plate,adjusting the length of the lower trapezoidal surface and the proportion between each trapezoidal surface can reduce the static ice pressure and achieve good protective effect.