Model Test Study on Stability Factors of Expansive Soil Slopes with Different Initial Slope Ratios under Freeze-Thaw Conditions

Expansive soil is widely distributed in seasonally frozen areas worldwide. Due to the special expansion and shrinkage characteristics of expansive related water content, there are potential engineering disasters subgrade slope engineering. To investigate physical mechanical changes within slope, four freeze-thaw cycles tests were performed on models an environmental chamber with ratios 1:1.5, 1:1 1:0.5. Nuclear magnetic resonance (NMR) technology used explain pore during freezing thawing. Model carried out monitor cracks, moisture temperature, displacement pressure model. The results show increase ratio may give rise more intense temperature changes, promote development cracks model, gradient migration rate Following cycling, structure destroyed reassembled, decreases as increases. Combined model NMR test results, can maintain a stable state after multiple freezing–thawing under specific content ωs.