For the hidden trouble in road subgrade stability by the influence from rainfall the paper puts forward the measure for treatment so as to ensure the normal use of roads.

Qinghai-Tibetan Railway roadbed being building will go through large area of the high-temperature and ice-rich permafrost, so the problem of roadbed stability will be an austerity challenge.

The design also eliminates the negative effect of rainwater on roadbed stability.

Influence of reservoir operation of Shuhe hydraulic power plant on roadbed stability of Zongxi section;

Based on the unsaturated soil strength theory and limit equilibrium method,this paper obtains the calculating formulae for the roadbed stability under the effect of seepage force of rain.

Factors analysis of subgrade stability due to rainfall infiltration;

Analyzing the subgrade stability of K2732+335～K2732+385 upper section on national highway 205;

Based on the laboratory tests,the influences of two subgrade compaction controlling index to the subgrade stability were compared,and a conclusion was obtained that it is feasible to control the quality of subgrae compaction by air rate.

Simulative analysis on heat stability of embankment in high temperature permafrost district of eastern Tibetan Plateau;