Study On Protection Of Subgrade Slope Of Passenger Dedicated Line In Combined Effects Of Wind And Rain

In recent years, a large number of road and railway construction projects generate a lot of slope protection works. With the increased awareness of environment protection, slope protection works should not only meet the engineering requirements, but also pay attention to the greening to minimize traces of artificial carving and harmonize with the surrounding environment. A prominent problem encountered of Chinese coastal slope is the impact of heavy rainfall and strong typhoons, which may produce slope erosion, even affect the normal operation circuit, and now studies referring the effects that wind and rain acting on the slope is not that deep, the design and construction tend to rely on previous experience and follow a set pattern with a lot of blindness, so systematic study is urgently needed. In this paper, embankment slope protection of Hainan East Central Railway was taken as an example, by using numerical simulation, model text and field test,issues like the role of the wind and rain acting on the soil subgrade slope and reasonable forms of slope protection under wind and rain conditions were studied.(1) The wind field distribution of the windward and leeward embankment slope under the effect of the wind were studied, recommendations about the choice and protection of embankment slope plants for strong wind case was proposed. Rain and slope soil properties affecting the slope erosion was analyzed. Some preliminary discussion about the slope soil erosion under the interaction of wind and rain was carried out.(2) The biotechnical was particularly introduced and mechanism of biotechnical was verified by artficial rainfall simulation tests, the vegetation slope not only beautified the environment, but more importantly had a strong slope protecting impact, which could effectively reduce the wind and rain erosion on the slope, and the protective form of engineering protection combined with Vegetation Protection was considered reasonable for strong typhoon and heavy rainfall.(3) Field tests were conducted and subgrade slope disease was found due to the substandard construction quality and heedless routine maintenance work, as well as slope protection measures not playing its sufficient performance. Thus in slope protection project, construction quality and routine maintenance work should be regarded seriously enough to achieve the desired results.