Abstract
Bei'an to Heihe highway is being widen to expressway at present in Heilongjiang province, some sections are located in ancient landslide bodies, influenced by the landform, rainfall, freeze thawing and anthropogenic factors, are in unstable states, bring great difficulties to construction. Took the Bei'an to Heihe expressway expansion project K177 landslide as the research object, employed the field investigation, geological drilling, field monitoring, indoor experiment and numerical simulation methods to carry an integrated study on the formation mechanism of the landslide. The research results show that: topographical, geological conditions and the water content change of slope rock and soil is the main reason causing landslide; atmospheric precipitation, seasonal freezing and thawing of the shallow soil and the island permafrost which scattered in the mountain valley melting provide a continued water source for landslide, thermal contraction cracks of slope surface and high permeability of surface rock and soil provide passage for water infiltrating, completely weathered mudstone above the aquifuge which is influenced by infiltration water to be soften forms rupture surface.
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