Abstract
ABSTRACTTo systematically evaluate the risk grade of stability of expansive soil slope during construction, the recognition model is established by using the fuzzy recognition theory and the analytic hierarchy process (AHP). Based on the characteristics of shallow slide of 22 expansive soil road sections constructed in China, the condition of slope body, swell–shrink grade, hydraulic and meteorological characteristics, supporting and improvement measures and other factors such as the construction technology and management level, vegetation coverage, soil layer, and drying–wetting cycles are selected as the evaluation indices, and the corresponding criteria of risk assessment system of expansive soil slope stability are also established. The weights of evaluation indices are obtained by using AHP method, and the measure functions are established to assess single index measurement and synthetic measurement. The maximum membership degree criterion is adopted to discern the risk grade of expansive soil slope stability. Based on this, the stability of expansive soil slope with different condition located in Nanyou highway and Beijing west 6th ring highway of China are analysed to verify the reliability of the present method. For practical purposes, the present risk assessment methodology can be used to systematically assess the slope stability in expansive soil zones.
Highlights
Expansive soil is a kind of geological body formed in the natural geological process which can have physical and chemical reactions with water, causing its own volume change
This paper presents a recognition model by using the fuzzy recognition theory and the analytic hierarchy process (AHP) to systematically evaluate the risk grade of stability of expansive soil slope during construction
Based on the characteristics of shallow slide of 22 expansive soil road sections, the condition of slope body, swell–shrink grade of expansive soil, hydraulic and meteorological characteristics, supporting and improvement measures and other factors such as the construction technology and management level, vegetation coverage, soil layer, and drying–wetting cycles during construction are selected as the evaluation indices, and the corresponding criteria of risk assessment system of expansive soil slope stability are established
Summary
Expansive soil is a kind of geological body formed in the natural geological process which can have physical and chemical reactions with water, causing its own volume change. Based on the Fuzzy- analytic hierarchy process (FAHP) method, recognition model of risk assessment of expansive soil slope stability is established with comprehensive consideration of influence factors. This paper presents a recognition model by using the fuzzy recognition theory and the analytic hierarchy process (AHP) to systematically evaluate the risk grade of stability of expansive soil slope during construction. Based on the characteristics of shallow slide of 22 expansive soil road sections, the condition of slope body, swell–shrink grade of expansive soil, hydraulic and meteorological characteristics, supporting and improvement measures and other factors such as the construction technology and management level, vegetation coverage, soil layer, and drying–wetting cycles during construction are selected as the evaluation indices, and the corresponding criteria of risk assessment system of expansive soil slope stability are established. The stability of expansive soil slope located in Nanyou highway and Beijing west 6th ring highway of China were analysed to verify the reliability of the present method
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