Study On The Mechanism Of Coupled Freezing And Thawing Characteristics Of Highway Tops In Seasonal Frozen Soil Areas

Heilongjiang river embankments will be affected by seasonal climate,every year by freezing injury of different level,such as the body of soil freezing and thawing of uneven settlement,a new highway because of the frost heave amount of crack,bulge,destruction of embankment in use process happen not only affects the efficiency of engineering play their at the same time also can increase the maintenance cost of engineering,so the research in seasonal frozen embankment damage problem is necessary,this article selects the representative soil samples in Hei he city love xin hui district township horse field pile number 6 + 500.First of all to retrieve soil samples to determine the basic physical properties,then theoretical analysis is made on the mechanism of freeze-thaw damage,the use of moisture migration test,triaxial shear test and freeze-thaw characteristic test for further study,the following conclusions are drawn:(1)the Heihe river belongs to the low liquid limit soil sample grading fine sand,in compaction,the engineering properties of stability,settlement after the completion of the W small;Eight bifurcation belongs to the low liquid limit soil sample grading undesirable sand,poor engineering properties,not easy compaction,after the completion settlement.(2)produce freezing and thawing is the outcome of combined action of temperature,power and water,the temperature is a driving force of moisture migration,water is the root causes of freezing and thawing,the load is the main influencing factors of the outside world,a new concrete highway destroyed mainly by gravity,strong support,caused by the force of frost heave and the uneven load.(3)introduced a new type of research of moisture migration test device,and the determination of the Heilongjiang river levee sand soil temperature field,moisture field and stress field of space,temperature along the depth has obvious hysteresis.