Study On The Sliding Soil Of The Loess Landslides

Based on collecting abundant information, the sliding soil is studied with field investigation and soil mechanic test. After referring to the information at home and abroad, using many vary theoretic means, the research outcomes of sliding soil in loess landslide is systemically analyzed and induced. At first, according to the formation condition and the various physic mechanics property of the loess landslide, the author systemically analysis and sums up the approaches and test means of sliding soil on loess landslide, and the characters of the slip soil's microcosmic and macroscopic. In the light of flied sampling, whetting the slice and the microscope observation, the character of the microcosmic structure is gained, then proves its deformation and destruction mode. Secondly, the destruction mechanism of the sliding soil is analyzed qualitatively, and further proves that the dissolving salt ion density change to turn the influence of the soil strength through hydro-chemical experiments and direct shear test from the ration attitude. The results indicate that the shear strength of the slip soil reduces as the dissolving salt ion density falls down. Combing a great of information, the engineering geological investigation and indoor experiments, the destruction regulation of sliding soil is summed up. Finally, as a typical example, with the field investigation, the author come down to the loess landslide that happened in a second class highway toll station of Leichai in Tongchuang, Shaanxi Province .On the base of the character of this sliding soil, using of optimization proceeding of fuzzy information to establish a model on shear strength and water content, and then use generate limit equilibrium method and FEM to calculate the stability of the slip soil. The writer finally suggests a measure that the support of french drain is main method and the method of chemical Solidification is supplement.