Analysis on influencing factors of Shear strength of Saline soil roadbed in the process of normal melting
The direct shear tests of three compaction degrees and 10 temperature nodes in the forward melting process of unsaturated saline soil in northern Hebei were carried out.The temperature de-velopment and pore water phase transition of soil during the forward melting process were recor-ded by a soil parameter rapid measurement platform,and the influences of unfrozen water and compaction degree on its mechanical properties were analyzed.The conclusions are as follows:1.The higher the degree of compaction,the faster the change rate of soil temperature,and the fas-ter the growth rate of unfrozen water content,and compared with the salt crystal water loss stage,the growth rate of unfrozen water content is also faster.2.When the degree of compaction is small and the temperature is low,the stress-strain curve shows the characteristics of brittle failure.With the increase of the compaction degree of the saline soil,the decline rate of the specimen strength is accelerated,and the increase of the cohesion is obviously greater than the internal friction Angle.3.The cohesivity of soil decreases significantly with the increase of temperature,while the internal friction Angle increases slightly,both of which show transient hysteria between-2℃and 1℃.
saline soilnormal thawing processcompactnessshear strengthunfrozen water contentfreezing temperature
NETL
NSTL
万方数据
