Study On The Corrosive Influence Of Slope And Control Techniques Considering Gansu Loess Area Of Climate Change

Many highway is constructed in the Loess Plateau where serious soil erosion and geological disasters issued. As geologic and hydrological environment in loess area is very sensitive to meteorological disasters, research on highway Slope erosion damage and slope protection and control technology under conditions of climate change in Gansu loess region, which is of great significance on the loess area highway construction and safe operation.Based on the loess of Gansu province highway slope erosion damage type of investigation, analysised the erosion damage features of freeway slope in Gansu loess under the influence of different meteorological factors, studied the variation of soil temperature and humidity inside loess slope under different weather conditions;By different rates of loess slope field rainfall experiment, analysised the formation process of the loess area freeway slope runoff and gully erosion and damage. Depending on loess slope shallow soil moisture changes in different rainfall intensity, raised the regression formula on soil cohesion and internal friction angle changed with the water content.Slope before and after freezing and thawing through the physical and mechanical testing, analysised Dingxi and Pingliang's variation of loess shear strength after repeated freeze-thaw cycle. In the same situation of freeze-thaw cycles, analysised the loess slope stability safety factor of sensitivity according to the soil shear strength, soil moisture content and slope of initial rate of change in slope,derived loess slope stability safety factor injury model in cold areas.According to the erosion characteristics of loess slope, three new board revetment slope protection type were proposed such as sowing straw reinforced soil protection technology, plant-flexible plate revetment and multi-stage small platform. Through the field rainfall testing and numerical simulation,analysised the mechanism on different slope protective types of.Given slope vegetation and plant fiber board's design and construction of slope protection method, which is provided the necessary technical support for the selection of a reasonable style on engineering practice forms of protection and slope protection system.