Study On Safety Risk Assessment Method Of High Carbonaceous Shale Slope Construction

The carbonaceous shale swelling soft rock is a low strength,easy weathering and disintegration,the excavation of the carbonaceous shale cutting high slope exposure in the air,with the passage of time and water erosion,mechanical properties of rock mass will change gradually,prone to softening and disintegration,the initial carbon shale mechanics the strength decreases sharply,causing the project construction process in the construction of a landslide or collapse instability,caused a huge hidden trouble to the national property and people’s life safety.Therefore,it has important theoretical significance and practical value to study the safety risk assessment method of high slope construction of carbon shale.The stability of the carbonaceous shale slope is the result of a variety of factors,and there is a very complicated uncertainty among various factors.Based on the background of a carbonaceous shale high slope on the Longchuan Huaiji highway in Guangdong Province,the safety risk assessment method of carbon shale high slope construction is studied by AHP and fuzzy theory.The main research results are as follows:(1)A detailed review of the theory and methods of risk assessment is made.This paper introduces the existing risk assessment procedures,risk assessment theory,evaluation methods,research status quo and development trend at home and abroad,and analyzes the shortcomings of evaluation methods.(2)The construction safety risk assessment index system of high cutting slope of carbon shale cutting is set up.Through consulting the industry experts from the geological factors,engineering factors,construction factors,environmental triggers,exploration and design factors,the safety risk of carbonaceous shale slope construction is analyzed,and finally,the safely risk assessment index system of carbon shale cutting high slope is obtained.(3)Using analytic hierarchy process(AHP)to calculate the weight of each factor of carbon shale cutting high slope,using expert survey method and experts’ opinions as calculation parameters to compare indexes.The weight of the factors suitable for the high side slope of the cutting of carbonaceous shale is obtained.By using the theory of fuzzy theory and adopting fuzzy theory evaluation method,we establish the corresponding evaluation factor set,evaluation grade and membership function through fuzzy theory evaluation,and then use the weight vector obtained by AHP to get the fuzzy judgement matrix,so as to carry out fuzzy operation.Through the analysis,the safety risk assessment index system of high cutting slope of carbon shale cutting is obtained.