Risk Analysis Theory And Application For Slope Engineering

Ranking only second to earthquake and debris flow, slope instability is the third geological hazard. Issues, such as, evaluations of slope instability and geological hazards of collapse, landslide and debris flow have been hot research topics in academic circles. As an engineering material with large variability, rock and soil mass, involved in slope engineering, is of great instability in various parameters and internal and external agencies in practical work. Compared with traditional analyzing methods, such as, risk analysis theory, based on various instabilities of engineering project, giving comprehensive consideration to probability and loss, presents new ideas and methods for evaluation of slope engineering. This paper, based on basic theory of risk analysis, combining technology project of the Ministry of Communications "Study on Monitoring and Forecasting Technology of Geological Hazards of Highways in Western Area (2003-318-802-01)" and the fund project of national nature science " Study on Evolution Mechanism of Earth-rock Mixture Landslides Based on Fluid-solid Coupling Interaction of Gradual Dissipation of Energy (50878213)", studies the following issues in respect of risk analysis and application of slope engineering:(1) Based on the collection of existing literature as well as the summary and analysis of slope instability mechanism, study the main deformation mode, the main failure pattern and the basic geomechanical model of slope. Defined five steady-state of slope, the risk source of slope engineering's evaluation index system contains eight elements of the three aspects, and the establishment of the evaluation system based on the math model-genetic level evaluation model using fuzzy mathematics to solve engineering problems.(2) Based on discussion of possibility analysis of slope failure with the main analytical method, set up evaluation system based on the T-S fuzzy neural network. Generate the sample by use of uniform distribution method as well as interpolation of slope stability standard data. Implement training with MATLAB software and test the error between the predicted value and actual output value.(3) Study the failure mode and affected object category of slope instability failure, and discuss the accounting method of assets and natural resources as well as statistical method of density and distribution of affected object. Study the basic symbol of damage extent and damage level. Carrying out a risk assessment of the affected body through two fuzzy comprehensive evaluation model based on AHP analysis to determine the corresponding relationship of the affected body damage grade, the rate of loss of value the strength of the geological disaster hazards and the reference standard of landslide affected body values hierarchy(4) Established the matter element comprehensive evaluation model, and analyze the risk of the slope.Summarize the concepts and theories of slope engineering risk characterization and acceptable risk level, and develop FN curves based on China's national conditions, which is the social risk and economic risk standard of landslide, providing quantitative criteria for the control and management of slope risk.(5) Relying on project of the unstable slope of Ying Punshan Primary School in Li County, Sichuan Province, and on the basis of geographical, hydrological and geological exploration, Discussed the danger source of slope, put forward the source of the risk of slope engineering evaluation index system and quantitative criteria. Meanwhile, with slate as the study object, hydraulic characteristics of rock is experimented and studied as well. Analyzed the risk of slope engineering and adopt preliminary research results in risk analysis and governance of the slope engineering.