The Research On Structure And Performance Of Rubber Powder Modified Asphalt Pavement Of Shangdeng Expressway

As one of the three global geological disasters alongside volcanoes and earthquakes,landslides have been highly concerned.According to statistics,more than 90%of the many landslides are induced by rainfall,and rainfall-induced landslides are characterized by sudden strong,wide distribution and high frequency.Rainfall-induced landslides severely constrain the social and economic development of disaster areas and pose a serious threat to people's lives and property.This paper is mainly based on the K142 landslide at Jiankun Expressway,which is complex in geology.Through the inspection of relevant materials,literature and on-the-spot investigation,combined with the indoor soil water characteristic curve and permeability coefficient test of slope soil materials,the GEO-STUDIO numerical simulation software was used to carry out different rainfall intensity on the K142 slope of Jiankun Expressway.Simulation of seepage and slope stability under rainfall duration conditions.The main work and conclusions of this paper are as follows:(1)The topic selection and research significance of this paper are elaborated in detail,and the effects of unsaturated soil characteristics,rainfall induced landslide mechanism and stability analysis methods on slope stability are three aspects of rainfall-induced landslide.The research status is summarized and summarized.(2)The natural environment and geological profile of the study area were identified and the detailed drilling exploration of the K142 slope was carried out to find out the structural characteristics of the slope.The layered structure of the landslide body is mainly composed of gravel soil and full-strong weathered argillaceous sandstone.The staggered complex of the landslide stratum is mainly composed of moderately weathered sandstone,strongly weathered argillaceous sandstone and moderately weathered carbonaceous shale.Combined with the monitoring data and detailed survey data,the slip zone is the fracture zone of the local cutting carbon shale and the strongly weathered argillaceous sandstone,and the weak zone of the full-strong weathered argillaceous sandstone.(3)Through the generalization of the calculation model,using the Seep/w software simulation,it is concluded that the permeability coefficient determines the flow path of the seepage field;the variation of the pore water pressure is affected by the rainfall duration and the rainfall intensity,and the groundwater level is simultaneously It also increases with the change in rainfall intensity and rainfall duration.The results of the different rainfall conditions of the Seep/w simulation are coupled to the Slope/w module,and the safety factors at different times are obtained.(4)The formation of K142 landslide body has certain internal factors(lithology,topography,structure)and external factors.The triggering factor is mainly rainfall.The mechanism of rainfall-induced landslide is mainly manifested in three aspects:1 Rainwater falls to slope body As a result,the bulk density of the soil increases and the sliding force increases;2 the rain causes the slope foot to soften and destroy the slope stability;3 the rainfall infiltration leads to the decrease of the mechanical properties of the soil,the increase of the groundwater level,and the increase of the pore water pressure,which eventually leads to the instability of the slope.