The Settlement Of The High Under The Coupled Action Of Freeze-Thaw Cycle And Dynamic Load

High-speed rail network is about to unfold in the country, and a large number ofhigh-speed railway is facing embankment ploblem caused by seasonally frozen groundand the thawing of frost. The passenger line from Harbin to Dalian in seasonal frozensoil areas which is an important part of the Chinese high-speed, and design speed is350km/h, because buiding in the seasonally frozen zone, dynamic load and frost heave isone of the important issues, and high-speed railway embankment settlement is verystrict that requirementing the final settlement is less than15mm, reinforcement is alsovery important on the frozen rail base. The high permafrost base of the railway is still inits infancy. Therefore, this paper is as follows:At first, doing a series of triaxial tests, results show that: on the soil frozen, the soilwill occur settlement during the1st loading, and the settlement will increase with theincrease of axial compression, and the settlement will also decrease with the axialpressure decreases during the1st unloading; the process of frozen soil damage in themelting is slower than in the unfrozen; the impact of the dynamic stress is very small inthe beganing, the sedimentation rate is increase after the soil begins to melt; thefreeze-thaw settlement is the result of the coupling of frozen subgrade and dynamicstress.Further freeze-thaw cycle test results show that: with the increaseing freeze-thawcycles, soil structure is destroyed gradually, freeze-thaw characteristics apparentgradually.Finally, simulated the railway settlement based on the Harbin-Dalian by the ADINAfinite element software, simulation of the freeze-thaw cycle by freezing temperature,freezing temperature, melt temperature, melt temperature which to be considered as acycle; the CFG piles can improve the railway-based settlement, and its a high-effectivemeasure, and then silement with changing the CFG piles parameter by using finiteelement software, the parameter such as: cushion plans, cushion thickness, the length ofpile, the distance of pile, the diameter of pile, and so on. It is guidance to frozen soilsubgrade.