Testing Study On Deformation Softening Characteristics Of Loess-Like Soil

The engineering geologic property in the region of Harbin is commonly well, but for many reasons there is loess-like soil distributing on different physiognomy elements. Because the scale of this kind of soil is not large, the embedding deepness and thickness is shallow, and the collapsibility is less or little, people don't regard the characteristics and collapsibility of this soil as important. It is different from the traditional collapsible loess, few people specially research on it. In case the structure is built on this kind of collapsible subsoil, it potentially produces large, fast and irregular deformation, at last, the structure cracks, even breaks down. Consequently, it has great practical significance to study on this soil.The paper is based on the testing data of the loess-like soil samples from Harbin, assuming the collapsibility coefficient as the main line, and combining qualitative analysis with quantitative analysis to study systematically the collapsible deformation of the loess-like soil in Harbin step by step.First carry out an experiment on undisturbed loess-like soil samples of different humidity content from Harbin area with both single line method and double line method compression tests, then contrast and analysis the test results of the two methods, in order to reflect the moistening or drying deformation characteristics of loess-like soil better.And then, comprehensively analysis the collapsibility of the loess-like soil in Harbin area.At last, constitutive equations of loess-like soil collapsibility deformation are established on secant modulus method aiming at generalized collapsibility which is named moistening collapsibility. This model refrains from the influence of original void ratio, which provides the evidence to the exact evaluation of collapsibility.