Test And Frost Heaving Technology For Subgrade Of Passenger Dedicated Railway In Severe Cold Region

In recent years, with the development of the national economic construction, tourism and national defense construction, and vigorously develop the full implementation of the infrastructure strategy, the state has increased investment in the construction of railways, highways. High-speed railway line for passenger, security and smooth running of the subgrade deformation more stringent requirements, the resolve and eliminate frost heave harm is an important consideration in the embankment design and construction. Carry out the roadbed test with anti-frost heave construction work aimed at the study of the subject, seasonal permafrost zone Passenger Line of the key construction technology to ensure the quality of construction projects and construction standards,To ensure the safety and the smooth completion of the project of Dedicated Passenger Line also provide guidance for future similar projects.In view of the seasonal frozen earth roadbed construction in key technologies and the difficulty, this topic has pointed carries on the experiment, the analysis research.The overall research route is:Collects in the domestic and foreign correlation data-room to experiment-the field test research-construction technology to summarize-the generalized analysis.The main research contents are:(1) roadbed padding room frost resistance experiment.Carries on the analysis to the roadbed padding microscopic structure; To under the different moisture content, the different silt carrying capacity and the different compactness roadbed padding heave quantity carries on the analysis, discovers smalls plasticity and heave relations which in the roadbed padding mixes in; And the intensity change carries on the analysis to the roadbed padding freezing and thawing test around. (2) roadbed padding field test.Mainly carries on the test to the ground temperature, determines frozen deep; And sinks to the embankment heave the distortion to carry on the observation friendly, carries on the observation to the roadbed pressure variation. (3) pair of passenger transportation special line roadbed complete set construction technology carries on the summary, in the key introduction construction difficulty and the solution, specially carry on the analysis to the roadbed anti-heave melting measure and the ground processing measure.In view of in the construction process, after how passes through a thaw-freeze cycle to guarantee the construction quality development research, proposes the guarantee roadbed frost resistance to be able technical measure.Summed through laboratory and field Subgrade and construction technology, design and construction of embankment bad foundation treatment cfg pile, phc piles and cement mixing piles several ground treatment can effectively control the deformation of foundation to improve the bearing capacity of foundation; while doing waterproof drainage measures to block the infiltration of surface water and groundwater, the use of a, b Filled Subgrade and strengthen the quality of transition segment filler, its moisture content control about the optimum moisture content, and in strict accordance with the maximum degree of compaction required for construction can effectively ensure the subgrade frost resistance, in order to ensure smooth and safe operation of the railway line embankment in seasonal frozen area.