Freezing And Thawing On The Physical And Mechanical Properties Of Loess And Engineering Applications

Loess widely distributed in the Northwest and North China, which is in seasonally frozenregions. In these areas, with the outside world of seasonal climate alternating, thephenomenon of soil will alternately appear frost heave and thaw. The freezing and thawing isone of the important reasons for the seasonal frozen soil of loess structures engineeringproperties deterioration, so it is necessary to study the impact of freezing and thawing of loessnature.In this paper, the study analyzed the impact of freezing and thawing on the physical andmechanical properties of loess with the indoor test method. And founding that, after afreeze-thaw cycle, the fine particles of Loess particles has increased, the void ratio hasincreased, the plasticity index has increased, and soil density has decreased. Also the loess andmechanical properties of shear strength has decreased, which the cohesive force has reduced,and the internal friction angle has increased. The Loess compression has increased. Throughcomparativing and analysising loess microscopic electron microscopy scanning photos afterdifferent freeze-thaw cycles, founding that after a freeze-thaw cycle, the arrangement of soilparticles, particle size, contact us, pore size has changed.According to the climatic conditions of the actual Luochuan, using Geo-Studio softwaresimulation to analyze the maximum freeze depth and the impact of the range of differentfreeze-thaw cycles of freezing and thawing in slope soil. Analysising the affect of freezingand thawing to the loess slope stability from the numerical and found that topsoil loess slopestability has greatly reduced after a freeze-thaw cycle.