Study On The Moistening Deformation Of Chlorine Saline Soil

Chlorine saline soil is highly collapsible.water plays an important role in collapse. The properties of saline soil is studyed based on the difference value of compress deformation before and after saturated, but the properties in the soaking process is no in-depth study. Since the dissolution of saline soil and the collapsible loess has very similar characteristics, the method studying the properties of saline soil in the soaking process is reference to the Loess moistening test method.In this paper, Luoyang loess is choosen as the female parent soil form Jingbian, Yan'an, Yangling and Luoyang Loess, and sodium chloride is choosen as salt chloride. Making up five kinds of saline soil by fixing the female parent soil and salt according to different ratio. The basic physical properties, chemical properties and compaction properties of the five kinds of saline soil were studied. The results showed that: the relative density of soil with the increase of salt content reduced, basically is described a linear function. With the increase of salt content, liquid, plastic limit was decreasing trend. Before salinity reached 4 percent, the salt content has a great influence on the exchange of sodium. The greatest drying density is got when the salt content has reached eight percent. The optimum water content gradually decreased with the increase of salt content.The result of compression test of saline soil is analysised from rheological theory. The results showed that the creep behavior belong to decay creep within the testy consoldition pressure. The overall trend of deformation at various stress is the same. The relationship between deformation and time is described a hyperbolic function. And several major factors effecting the deformation, including dry density, consolidation pressure and salinity, are studied.Through grading soaking experiment, the moistening deformation process duaring the soaking is studied, the main factors ,including dry density, consolidation pressure, salinity and water content, effecting the moistening deformation is analysised. The results showed that: the soaking compression process can be divided into three phases: the diffusion of water, the development of mositening deformation and deformation stability.With reference to the test of moistening loess shear, the samples which are the same salt content and different density are experimented. The deformation of each step is gradually increased with time after the sample is immersing by step, and the growth rate are smaller and smaller, tending to zero, that is, the deformation is achieved a stable value in a certain time. The time achieved stability is effected by pressure and pressure ratio and water content. On the same conditions, the greater the pressure, the longer the stability time ; the greater the pressure ratio, the longer the stability time; the greater the water content, the longer the stability time. Dry density, shear stress ratio and water content are affected on mainly shear deformation.