Field study and analysis of reinforced earth wall for expansive soils

The field tests have been done in order to study factors which affect the stability of reinforced earth wall.The results show that earth pressure increases quickly and vertical earth pressure in situ is greater than soil weight of unit area and coefficient of earth pressure is gradually enhanced when the filling height is low.Along with the increase of filling height,vertical earth pressure is convergent and less than soil weight of unit area.In the mean time coefficient of earth pressure is gradually decreased.The rainfall decreases vertical earth pressure and lateral earth pressure,but coefficient of earth pressure increases.Reinforced earth wall would happen not in shallow coast but in deep wedgy coast according to strain results of reinforced strips.The compact degree for expansive soils within 1.5 meters should be consistent with outside,otherwise it would induce uneven settlement and reinforced would't be strips effective.At last some suggestions have been put forward for construction of reinforced expansive earth wall in situ.