The Research Of Moistening Modulus And Deformation Of Loess Subsoil

Owing of the special structure of the loess, the moistening deformation of varying degrees is on show with the result of the pressure and water, causing a lot of projectal accidents. At present the subsoil is designed in Norm with the collapsible coefficient, which displays the saturated deformation of immersing and doesn't display the moistening deformation, relatively wrong compared with the fact, leading to the unnecessary waste and judging mistakes under some conditions. This text realizes the deficiency of research currently and thinks it necessary to study the moistening modulus and the method to calculate moistening deformation on loess subsoil.The moistening deformation is a additional deformation of increasing water content after it is steady under the pressure. The key to calculate the moistening deformation is to work out the variation of modulus of the loess subsoil.Through a plenty of data of compressal tests with a lot of samples which are different in moisture content and voids ratio , the relation between pressure,moisture content, cavity ratio and pressural modulus is disclosed in the paper,a table that is suitable for xi'an district is also made based on the data .Furthermore the text selects the stress path method to calculate the moistening deformation with compressing modulus after taking cavity ratio and moisture content into account.The compressing modulus can be picked up from the table .Thus,we can put forward a convenient method to calculate the moistening deformation.Use above-mentioned theory, analyze the project example of collapsible loess subsoil and validate it.