Controlling of Moisture in Subgrade Backfilling Sand

Moisture content in the sub grade will be affected by the external water level or rain after the moisture of sub grade reach to the equilibrium. According to the unsaturated flow, two-dimensional finite element method models of sub grade were established. Slope protection and blind drainage was used to study the influence to moisture of sub grade of backfill sand, the results indicate that the combination of slope protection and blind drainage was an optimal method, which can effectively reduce the moisture of sub grade.