Study On Stability Of Residual Soil Slope Under Wind Load

Due to terrain and economic constraints,most of China’s inland mountain wind farms are located on flat tops,and the margins of wind turbine foundations are limited from the edge of the site.During the operation process,slopes will be disturbed and slope slippage will increase.risks of.Especially in the mountainous areas of southern China,there is a large amount of residual soil cover.The slope itself is extremely unstable,and landslide disasters are very likely to occur under the disturbance of the wind turbine foundation.To this end,this article takes the residual soil slope in Huangjialun area as the research object and carries out a series of experimental studies.Firstly,the soil was qualitatively and classified according to the origin of the residual soil in Huangjialun area and the physical properties of the soil,and its soil properties were studied.Subsequently,the base pressure data in the field monitoring and scale model were compiled,and the dynamic load input data in the dynamic triaxial test was obtained.Then,the indoor triaxial test was performed on the remolded soil samples,and the residual soil samples in different working conditions The shear strength,internal friction angle,cohesion,dynamic modulus of elasticity and damping ratio were studied.Finally,the obtained dynamic parameters were sorted out,and the wind power foundation-slope model of Huangjialun was established using FLAC3D software,and the slope stability was analyzed.(1)The mass of soil particles with a particle size greater than 0.5 mm in the soil body accounts for 73.5%of the total mass of the soil body,which is greater than the limit value of 35%,and belongs to the gravel soil;the results of the liquid-plastic limit test indicate that the soil body The liquid-plastic limit index is 12.44,10<IP<17,the residual soil is cohesive soil,and the bedrock under the soil layer according to the drilling revealed that the bedrock is sandstone,so the residual soil in Huangjialun area is sandy gravel cohesive mud sandstone residual soil.(2)The confining pressure will affect the improvement of the consolidation strength on the shear strength of the soil,and the greater the confining pressure,the more obvious this weakening;and due to the compression of the particle spacing,the attraction between particles is greatly increased.The cohesion of the sample was greatly improved.(3)The pore water pressure will support the soil in the early stage of dynamic loading.However,due to the lubrication of pore water,after the test stress reaches the threshold value,the sample will appear unloaded and the microstructure will be accelerated;The change of confining pressure has little effect on the dynamic elastic modulus of the residual soil in the Royal Lunlun area.The elastic modulus of soils at different depths can be the same value by default.(4)The slope displacement under the wind turbine foundation vibration is mainly in the x direction,and is distributed along the center of the foundation toward the central axis of the slope edge;the way of expanding the slope top surface to increase the distance between the foundation edge and the slope surface can To a certain extent,the slope displacement is limited,but the effect is limited;the geogrid can well constrain the displacement of the slope,and can change the force state of the entire slope soil,but the geogrid is affected by its mechanism Near the top of the slope,the position where the overlying soil is less and the interaction force of the soil is small,and it cannot play a good supporting role.