Method for analyzing the shallow sliding stability of an expansive soil slope based on complete softening strength

Abstract

The invention discloses a method for analyzing the shallow sliding stability of an expansive soil slope based on the complete softening strength, which comprises the following steps: on-the-spot investigation and investigation are carried out on the expansive soil slope to obtain soil sample and hydrogeological data; physical and mechanical parameters of expansive soil are obtained by strength test of expansive soil. Fracture depth and saturation line height are determined according to hydrogeological data. According to the physical and mechanical parameters, crack depth and infiltration lineheight, the seepage analysis model of expansive soil slope is established. The stability of the first landslide is analyzed by the seepage analysis model and the stability results are obtained. The seepage analysis model is used to simulate the tractive failure process and the results of landslide characteristics are obtained. Based on the analysis results of stability and landslide characteristics which can reflect the instability mechanism of expansive soil slope, the design and construction of expansive soil slope can be guided. Beneficial effect: The method can correctly describe the failure process of the actual expansive soil slope, and can reflect the instability mechanism of the expansive soil slope.

Description

technical field [0001] The invention relates to a stability analysis method, in particular to an expansive soil slope shallow layer sliding stability analysis method based on complete softening strength, and belongs to the field of geotechnical engineering soil slope stability, especially the application research field of expansive soil slope stability analysis. Background technique [0002] Due to the sensitivity of expansive soil to changes in environmental factors, expansive soil expansibility and shear strength are complex and changeable, the failure mechanism and landslide characteristics of expansive soil slopes are different from those of ordinary soil slopes. When using conventional slope stability analysis methods such as the slice method to analyze the stability of expansive soil slopes, the calculation results are often quite different from the actual situation in terms of safety and landslide forms, so it is determined to be suitable for expansive soil slopes. Th...

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Problems solved by technology

Although the strength under dry-wet cycle conditions can reflect the strength characteristics of expansive soil, the number of dry-wet cycles in the actual environment cannot be defined and can only be artificially controlled indoors; when analyzing the stability of expansive soil slopes, the surface force or physical strength is directly used. The expansion force is introduced in the form, and the expansion force is applied to the slope as an external force. The expansion force is an internal force. This way of considering the expansion force is inconsistent with the actual situation; landslides on expansive soil slopes are shallower than ordinary soil slopes. Moreover, the landslide is caused by the gradual upward traction after the local failure of the slope toe, and the current stability analysis method of expansive soil slope cannot correctly describe the failure process of the actual expansive soil slope; for the safety evaluation of expansive soil slope, there are currently The study only takes the safety factor at the first sliding as the safety evaluation standard of expansive soil slopes, but in fact expansive soil slopes have multiple sliding surfaces from bottom to top, and the process of expansive soil traction landslides needs to be studied

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