Study On Erosion And Protection Of Expressway Subgrade Slope

With the process of reform and opening up,China’s economy with rapid development and the transportation industry has made a leap forward.However,in rainy areas or flood storage and detention areas,road subgrade landslides,scours and other water damage problems are common,which pose a serious threat to road construction,traffic operation and people’s lives and property.Therefore,it is of great significance and practical value to carry out research on water damage and protection of highway subgrade slope.Based on the analysis of waterlogging problems’ data,this paper fully considers the influence of hydraulic and soil quality on the subgrade slope erosion from the factors that affect the erosion of the subgrade slope.At the same time,the erosion and erosion of subgrade slope are studied through software simulation and model test.The main research contents of this article are as follows:1.By analyzing and sorting out the data of highway water damage,the types of highway water damage are classified according to different standards,and it is concluded that the geographical conditions and highway characteristics are the internal factors of highway water damage,and the climatic conditions are the external factors of highway water damage.The conditions of highway water damage include geographical conditions,highway characteristics and climatic conditions,from the scour mechanism of subgrade slope and rainwater scour In this paper,the mechanism of flood damage of subgrade slope is analyzed.2.Using the discrete element PFC calculation theory to establish the subgrade slope model,the key point of the simulation model is the selection of the modeling process and parameters.Select the subgrade slope with the slope ratio of 1:1.5,the compactness is 80%,85% and 90%,and the water flow scouring speed is 0.1cm/s,0.16cm/s and 0.2cm/s respectively to carry out the slope scouring simulation,to clarify the impact of compactness,scouring speed and scouring time on the subgrade slope scouring depth Ring.3.On the basis of in-depth analysis of the scour mechanism of the subgrade slope,the subgrade slope with a slope ratio of 1:1.5 is selected to establish the test model,and the cohesive soil and sandy soil are selected for the model filling,and the compactness of the soil is 90%,85% and 80%.Through the analysis of the model test results,the influence of different soil properties,compactness,scour time and scour speed on the scour depth of subgrade slope is obtained.4.According to the current situation and characteristics of highway subgrade slope erosion,the drainage protection,engineering protection and vegetation protection in the slope protection technology are analyzed.Different protection schemes have different effects.The advantages and disadvantages of the protection schemes directly affect the effect of the whole subgrade slope erosion protection.The combined scheme of drainage engineering and reinforcement engineering is selected to simulate the protection of subgrade slope,GeoStudio simulation software is used to analyze the streamline distribution,stability and reliability of the slope after protection,to verify the prevention effect of the joint scheme of drainage engineering and reinforcement engineering,and to prove the effectiveness and feasibility of the scheme.Based on the K4 + 000-k4 + 600 of Tianjin west section of Jinshi expressway,the effect of the joint protection scheme applied to the subgrade slope protection in the flood storage and detention area is verified.According to the current situation and characteristics of erosion and erosion of highway subgrade slope,this paper analyzes the drainage protection,engineering protection and vegetation protection in slope protection technology.Different protection schemes have different effects.The advantages and disadvantages of protection schemes directly affect the effect of erosion and protection of the whole subgrade slope.The combined scheme of drainage engineering and reinforcement engineering is selected to simulate the protection of subgrade slope GeoStudio simulation software is used to analyze the streamline distribution,stability and reliability of the slope after protection,to verify the prevention and control effect of the joint scheme of drainage engineering and reinforcement engineering,and to prove the effectiveness and feasibility of the scheme.Based on the K4 + 000-k4 + 600 of Tianjin Expressway,the effect of the joint protection scheme applied to the subgrade slope protection in the flood storage and detention area is verified.