多年冻土区抛石护坡路基室内试验研究

多年冻土区道路病害主要是由路基下冻土温度升高融化下沉引起。由于阴阳坡差异引起路基不均匀沉降而导致的路面纵向裂缝病害严重影响了路基的稳定性。通过室内试验研究了在相同温度边界条件下普通路基和抛石护坡路基的温度分布特征,对比分析了两种路基结构的温度差异。结果表明:普通路基的阴阳坡两侧温度分布极不对称;铺设抛石护坡后,这种状况得到了很大改善,并且抛石护坡下土体温度明显降低;抛石护坡能够降低路基温度和调节路基阴阳坡的温度差异;抛石护坡是多年冻土区防治路基融沉和纵向裂缝病害的一种可行措施。

Experimental study on ripped-rock revetment embankment in permafrost regions

Engineering damages of embankment in permafrost regions are mainly caused by thaw settlement of permafrost.Its stability is destroyed with longitudinal cracks of embankment caused by asymmetric settlement of permafrost.The temperature properties conditions of a traditional embankment and a ripped-rock embankment were contrasted by laboratory experiments.Results showed that the temperature distribution of the traditional embankment was asymmetrical;the asymmetrical status was changed after ripped-rock revetment was installed and the soil under the ripped-rock was cooled obviously;the ripped-rock revetment could cool embankment and adjust the temperature difference between the north-facing slope and the south-facing slope;the ripped-rock revetment was an available technique to protect embankment from thawing settlement and longitudinal cracks in permafrost regions.