The Research On Collapsibility Of Loess In Guanzhong Area

With the development of the national economy and the accomplishment of the strategy of the West exploiting , Guan-zhong area is more important as the economic center of the Shaanxi province and the West-north area . At the same time the area is in the distribution region of collapsible loess in China , which determinates the collapsibility distortion of loess is the inevitable question when infrastructures are built in the area . On the other hand , the collapsibility of Guan-zhong's loess is medium-scale , which is different with the area of the west and the east of Ganshu , the north of Shaanxi . This should be discriminated during building avoiding unnecessary waste . So the systemic study to the character of collapsibility distortion of Guan-zhong area is important in the theory and experience , which may provide the theory rule to the economic method during engineering design . The paper is based on the testing data of the collapsible loess' example of Guanzhong area , and assumes the collapsibility coefficient as the main line . And using qualitative and fixed quantity method to study systematically the collapsibility distortion of Guan-zhong area's loess step by step . First the paper divide the collapsible loess of Guan-zhong area into desk area and wide region of no relief . And using conventional test to get loess' mesh size and the content of soluble salt and their changing tendency , using X diffraction paternity test and chemical constitution test to get its mineral component and chemical constitution. Then on the base of individual analysis of influencing factors of loess' collapsibility, the equation of regression aiming at the collapsibility coefficient and vital data of loess of Guanzhong area is established, which includes pore-solids ratio, plasticity index, moisture content. The correlation verification and the comparison between calculation with reality prove its correct result . Last, constitutive equations of loess humectation collapsibility are established using secant module aiming at generalized collapsibility which is named humectation collapsibility . This module refrains from the influence of original pore-solids ration , which provides the evidence to the exact evaluation of collapsibility .