Analysis And Research On The Settlement Of The Subgrade In The Saline Soil Area Of Inner Mongolia

Inner Mongolia area contains a large area of saline soil area.In recent years,with the factory moved from coastal to inland policy,the government has stepped up its efforts in infrastructure construction.Highway construction is the first place in the investment.Most of these roads go through the saline soil area,so the analysis of the saline soil area roadbed are necessary.The settlement of the subgrade in the saline soil area is affected by many factors,including the nature of the filler,the slope gradient,the hydrological condition,the design standard,the compaction of the roadbed,and the state of the salt in the soil.Based on the analysis of the formation of saline soil causes,the classification of salinity soils was carried out.The types of salts were determined by the laboratory of readily soluble salt chemistry.The optimum moisture content and maximum dryness of soil samples were determined by compaction test.The effects of different salinity and water content on the compressive properties and bearing properties of soils were studied.Based on the results of the indoor test,the finite element analysis model was established by comparing the D-P model with the near field condition,and the plastic deformation of the saline soil subgrade was carried out by arranging the site subsidence observation scheme to analyze the causes of the settlement during the construction.The finite element analysis is carried out,and the reliability of the finite element simulation settlement is explained by the observation results of the subsidence.