Research On Settlement And Deformation And Stability Of Reinforced High Steep Embankment

In recent years,with the widespread application of embankment reinforcement technology,more and more problems accompany it,especially for steep high embankment.For the construction of subgrade on high and steep slopes,because of its high filling height,steep slope,increasing service life and complex topography and geology in mountainous areas after completion and operation,problems of settlement and deformation of embankment and stability of embankment often occur.Reinforcement can significantly improve the overall stability of high embankment on steep slopes.Therefore,the settlement of high embankment on reinforced steep slopes can be significantly improved.The study of deformation reduction and stability is particularly important.In this paper,the PFC^2D particle flow software is used to simulate the pull-out test of reinforced soil,and the interface characteristics of reinforced soil contact interface are studied from a mesoscopic point of view.Then the displacement and stress monitoring tests of the reinforced steep slope high embankment model are carried out.Finally,the deformation and stress distribution of the reinforced steep slope high embankment are analyzed by FLAC^3D finite difference software,and the stability of the reinforced steep slope high embankment is made.The main research contents include the following aspects:?1?The pull-out test of reinforced soil is simulated by PFC^2D particle flow software.Four kinds of normal stresses,25kPa,50kPa,100kPa and 200kPa,are used to analyze the relationship between pull-out force and displacement under different normal stresses,and the relationship between pull-out displacement and shear stress.?2?This paper studies the interface characteristics of reinforced soil drawing from the mesoscopic point of view,including three aspects:firstly,by recording the evolution process of particle displacement vector,the formation and development process of the interface is studied;secondly,the variation law of the thickness of the pull-out shear zone in the process of drawing is studied,and the influence area of the interface is studied;thirdly,the mesoscopic parameters in the circle are measured.Variation rule and characteristic particle trajectory.?3?The horizontal stress and displacement of each monitoring position of geogrid are monitored and recorded under the normal stresses of 25 kPa,50 kPa,100kPa and 200 kPa respectively through the pre-selected monitoring position of geogrid.The distribution law of horizontal stress and displacement of each monitoring position of geogrid under different normal stresses is studied;the horizontal stress of different types of geogrid is studied by changing the parallel bonding parameters.Distribution of displacement and displacement.?4?From the experimental point of view,the influence of reinforcement on the settlement and deformation suppression ability and stability improvement of steep high embankment is studied.First,a series of silty clay foundation tests were carried out to measure the physical and mechanical properties of silty clay.Then,silty clay embankment model and silty clay reinforced embankment model were made respectively.Finally,the horizontal displacement and internal stress of the slope of the unreinforced embankment model and the reinforced embankment model were monitored respectively.?5?FLAC^3D finite difference software is used to simulate the high embankment on reinforced steep slope.The deformation distribution law of the slope surface and the interior of the embankment without reinforcement and the reinforced embankment is studied.At the same time,the internal stress distribution law of the unreinforced embankment and the reinforced embankment is analyzed.Among them,nine different types of reinforcement are analyzed,and the effects of different reinforcement positions on the deformation and stress of steep high embankment are compared and studied.?6?The stability of reinforced steep slope high embankment is studied,and the variation of embankment safety factor and maximum tension of geogrids under different single-layer reinforcement positions is studied.By comparing the maximum shear strain increment equivalence nephogram,embankment safety factor and slip surface distribution map of nine different types of reinforcement,the influence of different types of geogrids on embankment safety factor and edge is studied.The influence of reinforcement on the stability of high embankment on steep slope is analyzed.?7?The numerical simulation of preset cracks in reinforced high embankment with steep slope is carried out.The shear slip and expansion of cracks are analyzed,and the restraining effect of reinforcement on the development of cracks in embankment is explored.