Based On Finite Element Analysis Of Silt Sub Grade Slope Stability

The plain region produces large amounts of natural sand because of the river alluvial, after a long and black clay sedimentation formed with special properties of silt soil, silt soil composed of fine sand and silt particles, compared with fine clay filler, low cohesion. Plain area of sub grade filling construction cost considerations generally use the local silt soil, bare silt sub grade slope affected by various factors are prone to failure caused by embankment collapse, to bring huge economic loss. In order to improve the silt sub grade slope stability, need uses clay edge processing. At present, lack of the silt sub grade slope stability evaluation theory research, construction stability analysis dependent on experience, with the actual state of silt sub grade slope there is deviation.In order to accurately grasp the practical engineering of various structural section and silt soil mechanics strength factors on silt sub grade slope stability influence, chose to representatively silt sub grade sample, in the light of soil physical property, water physical and mechanical property for test, according to the test results research based on ABAQUS strength reduction slope stability analysis model, on the basis of, study the influence of finite element software setting parameters on slope stability analysis and calculation; combination of silt sub grade slope finite element model,taken a evaluation of the effect of protective measures that improve the structural stability and chooses the optimal scheme; understanding silt sub grade slope washout mechanism, comparison of scour size to determine the best anti-erosion measures. The results show that:By using the strength reduction method is established and the ABAQUS finite element model analysis of silt sub grade side slope stability is feasible. Analysis of process should be using shoulder node occurring transverse displacement as the slope failure criterion; Different silt sand embankment filling height has certain limit, should use1:1.5slope; claying filler soil could lower the liquid level inside sub grade and erosion effect, Width should be in lm-2.5m, soft ground base thickness more than3m will make the sub grade side slope lose stability, when powder sand excavation, should taking attention of slope bottom soil stress release on the stability influence; Silt sand embankment with high soil cohesion slope stability is well; When the sub grade soil cohesion is low, Powder angle of internal friction of sand and soil friction angle should be greater than a certain limit to ensure that the new embankment slope stability meet the requirements; Masonry protection can be used as further strengthening silt sand roadbed slope effective measures. Three dimensional vegetation soil fixed grid is optimal anti scour protection measures. Research results can be used for silt sub grade and similar soil sub grade construction, and provide the theory support for slope protection.