聚氨酯护坡结构静冰力学试验研究

Experimental Study on Ice Mechanics of PUR-Revetment Structure

碎石聚氨酯护坡是一种新开发的水利技术。其结构与碎石沥青护坡相似,不同的是碎石以聚氨酯黏合而不是沥青。为了研究碎石聚氨酯护坡在寒区工程中应用的特性,以大庆红旗泡水库的冰厚过程和温度过程为原型试验条件,开展了碎石聚氨酯护坡在冻胀力和冰推力联合作用下的稳定特性研究。通过分析碎石聚氨酯护坡结构内部温度变化过程、冰厚生长过程、变形过程以及受力过程得到如下结论:碎石聚氨酯护坡多孔的结果有利于其下基土温度场的均匀分布;在冻融周期内,会产生较大的竖向变形和较小的坡向变形,且均不会完全恢复,因此在设计过程中应考虑对护顶和固脚进行加固;冰在融化阶段产生的冰推力较大,应注意在春季融冰期冰推力对护坡结构的破坏。

PUR-revetment is a newly developed method for hydraulic engineering application. Its structure is similar to that of open stone asphalt revetment, but the crushed stones are glued by polyurethane（PUR） instead of bitumen. In order to study the characteristics of applying PUR-revetment in cold regions, an experimental research of the stability of PUR-revetment under the frost heave force and ice pushing was conducted based on the prototype test conditions of ice thickness and temperature proces- ses in the Hon4gqipao Reservoir of Daqing. The process curves of internal temperature, ice growing, deformation, and mechanical characteristics were analyzed to obtain the following conclusions： （1）the porous structure of PUR-revetment can result in the u- niform distribution of temperature field under the revetment; （2）during the freeze-thaw cycle, a larger vertical deformation and a smaller slope deformation of PUR-revetment occur, but both deformations cannot recovery completely, thus it is necessary to take reinforcement measures at the roof support and slope foot during the designing process; and（3）the maximum ice pushing occurs durin~ the thawing period, therefore appropriate icebreaking measures need to be performed to eliminate the effects of ice pushing on the revetment structure.