Research On Saline Soil Subgrade Treatment Technique In Turpan-Hotan Tie Line

With the rapid development of China's economy and the "western development" policy in-depth implementation,the construction of the western transport infrastructure is proceeding in an orderly manner.Turpan-Hotan tie line G3012 Mo Yu and Hetian section for the "national highway network planning" "71118" network in the seventh horizontal line G30 second contact line,the surface water is abundant along the surface,the daily difference is large and the sunshine time is long,the local silt,clay strength is low,the maximum frost depth is 67 cm seasonal soil exists,and most of the road surface to sulfuric acid(sulfite)mainly make the surface of the road salt content,capillary strong,easy to lead to roadbed soil salt swelling,melting and corrosion damage.In this paper,based on the local materials,the use of inorganic binder to stabilize the sulfuric acid soil for roadbed filler.The project team first tested the geotechnical properties of the Suean-Hetian line G3012 Mohe and Hetian area.According to the soil along the road,the lime and lime fly ash were used to reinforce the soil samples according to different proportions.On this basis,The effects of unconfined compressive strength,bearing capacity,salt burning performance,frost resistance,water stability and compressive modulus of elasticity were studied.In the case of frost resistance,the freezing and thawing stability times and the frost resistance coefficient of the project area are put forward.According to the main failure modes of the dissolution,salt expansion and corrosion of the saline soil subgrade in this area,the inorganic binder is used to stabilize the saline soil And combined with the need to improve the roadbed,dynamic compaction of soil,set the fault layer and other technologies combined approach to comprehensive management of saline soil along the area of the problem,to ensure the durability of roadbed pavement and good road performance.The content of this study can effectively solve the problem that the sulphated soil can not be directly applied to the local roadbed filling.By using the stabilizer for the improvement of the saline soil,it is not only effective to use the local saline soil resources,but also find the best stability Agent mix ratio,but also greatly improve the road in the design life of the durability and safety,with significant social and economic benefits.