Correlation Of The Collapsibility Of Loess And The Physical Index

Collapsibility that can not be ignored is an important property among many engineering properties of loess. How to effectively use quick, simple and economical method to analyze and solve the Collapsible issue in line with the rapid development of infrastructure is an important measure to save engineering manpower, material and financial costs.That are all of great significance.This paper is based on the Loess that were sampled of three base stations of Ledu County, Haidong city, Gansu Province.Through indoor test, the data of physical and mechanical properties and collapsibility of collapsible loess were analyzed.The relationship of collapsibility coefficient and physical indicators of loess were studied. Build the analysis model of loess collapsibility. Finally, it was proved that the feasibility of the model. The main work and achievements of this paper were as follows:(1) The influencing factors and the mechanism of loess collapse were analyzed. The method of multiple linear regression analysis based on SPSS was proposed.(2) The physical properties of collapsible loess were studied. Through analysis of data of the physical properties, water rationality, mechanical properties and Collapsibility of loess that changes with depth, indicating that the average natural moisture content of approximately 16%,an average dry weight of the 15.0kN / m3,and an average density of gravity in 15.0kN / m3,the average dry severe below the 15.0kN/m University, the average void ratio of about 0.900,the average density of gravity at around 15.0KN/m University, average pore than around 0.900, porosity with depth of gradual decreasing trend; the average saturation of about 32.7%. Average reduction coefficient collapsible loess changes little.Collapsibility coefficient increases with the depth gradually have smaller trend.(3) The relationship between the collapsibility and physical index of loess were studied. The relationship between the collapsibility coefficient and the physical index of collapsible loess showed that: there is a good negative correlation of collapsibility coefficient and the dry weight of gravity density, natural water content, saturation. Have a good positive correlation of collapsibility coefficient and the void ratio, porosity, natural water content. The correlation is not obvious with collapsibility coefficient and compression coefficient, compression modulus.(4) A prediction model of the collapsibility coefficient based on SPSS was established. Use Experimental data to prove the feasibility of analysis model of loess collapsibibility.