Study On Safety Risk Assessment,Monitoring And Reinforcing Measures For High Slope Of Xinhuang Toll Station In Huaixin Expressway

There are many expressways in mountainous areas of Hunan province.The high slopes of mountainous and hilly areas are widely distributed,and the landslide accidents occur frequently due to bad geology and weather;The influence of high slope instability in operation period is more serious。This paper is aimed at the high slope of the expressway during the specific operation period of the slope of Xinhuang toll station in Huaixin Expressway were carried out in following studies,The major content and conclusions of this thesis include::(1)According to "Guidelines for Safety Risk Detection and Evaluation of High Slopes of Expressways in Hunan"(Trial Implementation)listed steps and recommended methods,The safety risk assessment of the slope was carried out during the operation period,Through the three steps of static basic information collection,on-site dynamic information inspection and high risk slope stability investigation and analysis,selecte and weight the basic index,The risk assessment level was calculated as level IV.According to the corresponding level,the next steps are implemented to avoid the purpose of the malignant security accident.(2)By making a monitoring plan and monitoring on the stability of the slope was carried out,through the analysis of the monitoring data of rectified found that first,three,five slope surface displacement respectively is 56.95 mm,43.5 mm and 39.5 mm,all of them are more than the alert value,the first level of slope displacement change especially,displacement change is more significant in heavy rain weather,there are mutations,there may be a sliding surface,but considering the particularity of the location of the slope and the local actual conditions,in order to ensure that under adverse weather such as heavy rainfall during the operating period safety accidents such as slump,the stability of the need for further analysis.(3)The safety and stability of the slope subjected to two general conditions and severe rainfall conditions were simulated by using Midas/GTS finite element analysis software.By analyzing the safety factors of slope,displacement,strain,Stress and other results were compared and found that the slope under strong rainfall conditions,the displacement increased significantly stress and strain increased significantly,there will be a significant potential sliding surface,the safety factor is less than the standard value,the slope will be in an unstable state.(4)In view of the fact that the slope is unstable under simulated heavy rainfall conditions,the most suitable reinforcement scheme is obtained by analyzing the existing slope reinforcement methods from engineering aspects and reinforcement effects.By combining different engineering parameters through transformation,Finite element software calculates a total of twenty-five conditions in the strong rainfall conditions,the reinforcement effect than the final selection than the best reinforcement program:the length of anchor L=llm,the inclination of anchor α=15°,the spacing of anchor S=3m,and through the finite element simulate the program,The safety factor is improved,verify the effect of the reinforcement scheme is feasible,provide a data reference for the subsequent development of the actual slope reinforcement program,have a good reference value for the project.