Study On Safety Monitoring Technology For Weathered Granite Slope Construction Of Expressway

Weathered granite slope is by the weathering degree of different combinations of granite weathering zone and become a kind of geotechnical slope hybrid,poor stability,the construction safety influencing factors,risk control is difficult,to master the comprehensive technical conditions of the slope on the slope safety management plays an important supporting role.Highway slope safety monitoring as the most direct and the reflect the status of slope technology the most effective way,in all types of slope are widely used in the construction and operation,and is of great significance for highway construction operation safety.This paper focuses on the construction safety risk management of weathered granite slope of expressway,carries out the construction safety risk assessment and construction safety monitoring of weathered granite slope,and studies the dynamic assessment of construction safety and dynamic regulation of construction safety risk of weathered granite slope combined with the focus of monitoring.The main research results are as follows:(1)Weathered granite were analyzed by using finite element software of the slope safety factor,stress,displacement and strain change rule in the construction process,analyzes the construction process,the change rule of slope stability,slope deformation and failure forms and areas of potential security risks of the main inducing factors and may lead to the slope safety accidents,etc.,as the weathering granite slope construction safety risk monitoring and control of main basis.(2)The weathering degree of the weathering zone of granite varies continuously without obvious interface.It is difficult to determine the soil layer and scope of the internal slip of the weathered granite slope.The key points of the construction safety monitoring are the surface displacement of the slope,the internal slip of the slope,the stress of the anchor cable(rod)and the deformation of the slope protection facilities.(3)By using attribute recognition theory and mathematical statistics method,the evaluation criteria of attribute normality for construction safety monitoring unit of weathered granite slope are established.The dynamic evaluation of attribute normality of slope construction safety monitoring unit is realized,which provides a basis for the analysis of slope construction safety risk and the regulation of safety risk.(4)Analytic hierarchy process(AHP)is used to construct the relationship between the monitoring indicators and the safety state of the slope.According to the attribute recognition theory model,a dynamic evaluation model of the construction safety of weathered granite slope based on automatic safety monitoring is established.Combined with the variation rule of slope safety state in the process of slope construction,the dynamic evaluation of slope construction safety based on automatic monitoring is realized,which can provide a basis for dynamic control of slope construction safety risk.(5)In view of the abnormal state of slope safety and the unexpected risk of slope construction safety,based on the dynamic assessment of the construction safety of weathered granite slope,the corresponding risk control measures are adopted.By comparing the results of the construction safety assessment before and after the risk control,the effect of the slope construction safety risk control is analyzed and evaluated.(6)According to the safety risk assessment of weathered granite slope construction before construction,the automatic safety monitoring of the slope during construction,and the dynamic safety assessment and control measures of weathered granite slope construction based on safety monitoring,the safety control system of weathered granite slope construction of expressway is preliminarily established.The dynamic management of construction safety of weathered granite slope of expressway is realized through automatic safety monitoring.