| Slope, the geological body of the nature,is the most common geographical environment of human production and life, and closely related to the various activities of human beings. Because its stability is affected by many factors constraining, such as strata characteristics, topography, geological structure, groundwater, earthquake, human activities,etc.,the performance of slope stability turns out dynamic, non-deterministic.So its stability analysis of geotechnical engineering has been an important research topic, occupying an important position in engineering practice.Loess slope is particularly prominent in the region. Due to the arid and semi-arid climate, loess slope essentially is classified into unsaturated soil slope.With regard to controlling physical properties of unsaturated soil, matricsuction plays an important role.In the case of rainfall infiltration,water infiltration so narrows unsaturated zone at the top of slope, and local temporary saturated zone presents, leading to decreased matricsuction of slope soil body, and weak shear strength, thus a decline in slope stability. It can be concluded that rainfall infiltration is the main factor contributing to slope instability, which is the focus of this study.There are many different ways to analyze the slope stability, and their characteristics differ under certain conditions of application. So it is believed to be exceptionally important to adopt reasonable and effective methods suitable to give one appropriate analysis on slop stability according to engineering geological conditions, the specific purpose of analysis and accuracy. Slope-stability-analysis methods currently fell into two categories:certain analysis and uncertain analysis.This paper is to employ slope stability analysis on unsaturated soil under the influence of rainfall infiltration, introducing motion equation of water molecular from unsaturated soil for the solution to moisture content in slope soil under the rainfall infiltration, but also taking into account the relationship between it and shear strength of non-saturated soil.So this paper firstly adopted the limit equilibrium method, the most typical one of the certainty analysis to value non-saturated loess slope stability;Since engineering is a complex open system, influenced by many factors and with considerable random, fuzzy and uncertainty, the traditional mechanical method of calculation had many problems and shortcomings,therefore, this article is devoted to providing an evaluation on loess slope stability with artificial neural network in response to the same conditions,and evaluation results of the two methods were compared.
|
PDF Full Text Request