Instability Mechanism And Disaster Prevention Of Highway High-filled Embankment Slope On The Mountainous Area

High fill embankment slope as a complex topography and geology conditions of the main form of mountain area highway roadbed,the deformation damage,stability and disaster prevention and control has attracted much attention in recent years.In this paper,based on highway sanming xia sha period of high fill embankment construction of engineering practice,the summary proposed high fill embankment slope of three typical damage type,and analyze the influence factors of deformation and failure,and combined with engineering example analysis,the finite element method to simulate the instability mechanism of typical high embankment deformation is studied,and advances some countermeasures for disease prevention and control of the corresponding high embankment.The main work and research results were as follows:(1)Based on mountainous area highway roadbed fill the summary of engineering geological model and case analysis,put forward pingos deformation,foundation deformation and sliding base sliding deformation such as three kinds of typical failure mode of high fill embankment slope.(2)Discussed the embankment filling slope rate,filling thickness and vehicle load,the influence of factors on the deformation of pingos mode;The thickness of the soft ground is analyzed,weak base,weak foundation mechanism of slope sliding of foundation deformation pattern;Basal stagnant layer formation mechanism is studied and stagnant water strength parameters change on the influence law of basal slip deformation mode.(3)Consider short-term heavy rainfall condition,the rain to fill roadbed,roadbed slump deformation instability,due to the embankment filling in a relatively flat,on the foundation of the upper filled soil roadbed along the two side sliding deformation trend.(4)Under the effect of embankment load,the weak foundation bearing capacity is insufficient,lead to the upper filling body cut through the lower soft ground,whole sliding deformation.(5)Upper weak subgrade base surface drainage,rainwater infiltration to the basal surface discharge in basal formation of stagnant water softening basement rock mass,the upper integral sliding along the basal surface of embankment deformation destruction caused.(6)Based on the analysis results in the study of the typical deformation instability mechanism from foundation treatment,retaining wall reinforcement,subgrade drainage and monitoring measurement and so on high fill embankment slope disaster prevention and control countermeasures are put forward.