The Study On Slope Consolidation Of Different Soil Bioengineering Technology

Soil bioengineering has been widely used as a good ecological restoration measure for river Banks.The development characteristics of plants and their effect on slope reinforcement are important indexes to evaluate the application of soil bioengineering technology in slope rehabilitation.This study based on the investigation of plant growth suitability under different cutting conditions and soil biological engineering measures,further study the time and space distribution characteristics on cutting measures and different soil bioengineering measures.The finite element rainfall infiltration models of different soil bioengineering slopes were established by ABAQUS finite element analysis software,Four kinds of soil bioengineering measures of cuttings 、 brush layering、brush mattress、living fascine were obtained under different rainfall intensity conditions and different ratio of slope,research shows:(1)When the cutting method is adopted as the soil bioengineering technical measure,the 1.5~3cm dry willow branches should be selected,the cutting depth is 30 cm,and the cutting is performed perpendicular to the ground.At this time,the plant growth performance is the best.(2)The growth characteristics of the above ground parts of the four measures were significantly better in 8 to 12 growth months than that of 12 to 18 growth months.At 18 months,the root number of brushmatress and living fascine were significantly larger in the shallow soil of 0~30 cm than that of cutting and brush layering measures.Overall,the cuttings performed best,its roots mainly growth in 30~40cm soil combined with brush layering.(3)Within the increase of soil depth,At begin the shear strength of root-soil composites with different soil bio-engineering measures increased and then decreased.And The moisture content of root-soil composites showed a decreasing trend.The shear strength of different soil bioengineering measures is ranked as the cuttings >brush mattress>brush layering>living fascine.(4)Different soil bioengineering measures are resistant to the displacement of slopes: cuttings >brush mattress>brush layering>living fascine.Under different rainfall conditions,soil bio-engineering measures were used to reduce the displacement of shallow soils from 0 to 50 cm in slopes.As the rainfall intensity increases and the slope of the slope increases,the soil bio-engineering measures increase the safety factor of the slope more obviously.When the rainfall intensity reaches 60mm/h,the safety factor of the slope decreases to less than 1.0.