冻融循环条件下土的融沉性质试验研究

Experimental study on thawing subsidence characters of permafrost under frost heaving and thawing circulation

多年冻土地区路基病害主要由冻土土体在季节变化条件下的冻融循环造成的。因此,本文结合青藏铁路清水河、北麓河试验段土质条件,通过室内试验探讨和研究了不同土质在不同含水率、密实度、荷载条件下,反复冻融过程中的融沉特性。并探讨了循环融沉系数与融沉系数的关系及表达式,为进一步深化对融沉特性的认识提供了参考。

The disease of subgrade in permafrost region was mainly induced by frost heaving and thawing circulation of frozen soils because of change of seasons. Considering the different soils in different test sections of Qinghai-Tibet railway from Golmud to Lhasa, the thawing subsidence characters of frozen soils with different water contents, densities and loads under frost heaving and thawing circulation were studied. The relationship between thawing subsidence coefficient and cyclic thawing subsidence coefficient and the formula were discussed too. All these works were beneficial for deep understanding about thawing subsidence characters.