Research Of Law And Design Standard Of High Fillback Embankment Deformation In The Mountainous Area Of Guizhou

Relying on the subject of Guizhou Province Department of Transportation projects "Law and mountainous Guizhou Province roadbed design criteria Expressway mixed high cut and fill subgrade engineering,research Guizhou rock-soil filled high Situation foundation fill embankment using,select the line Guizhou Guizhou white rock Mixtures of indoor tests,analyze the correlation between the intensity of each index and percentage of rock between.For Guizhou typical Rock Mixtures of different heights,different than Rocky,Rocky different degree of compaction case mix large-scale geotechnical centrifuge test and Abaqus finite element modeling and analysis,research subgrade settlement law under different circumstances.The main findings are as follows:Guizhou highway most of the sections of roadbed filler is typical metamorphic limestone filler high fill roadbed filler.This article Rocky mix of stone according to the intensity of the low class easily weathered,wind strength and capabilities middle class,high strength of the strong wind etc.classified according to the percentage of rock made of different construction techniques and quality control indicators.Earth Mixture percentage of rock with unconfined compressive strength,the California Bearing Ratio(CBR),resilient modulus and percentage of rock were tested positive relationship.Earth Mixture unconfined compressive strength between 26 ~ 59.8Mpa;California Bearing ratio between 14.2 ~ 50.6(CBR value)between;soaked expansion amount between 0.01% to 0.2%;resilient modulus the amount is between 25.8 ~62Mpa.Through the indoor centrifugal model tests and numerical simulation,proportional to the height of subgrade settlement and models.Rocky centrifuge test model for the next 30:70 ratio,the model is stable,there was no landslide or pro package phenomenon,indicating better performance and Rock Mixtures.Proportional to the height of subgrade settlement with the model,the maximum rate of change appears in the roadbed height 1/3 to 2/3.Is closely related to the case with a high stone content and Embankment subsidence and compaction,subgrade soil in the lower part by an upper pressure significantly increased sedimentation,subgrade surface settlement is the largest settlement of subgrade at the midline,midline by road gradually reduced to the road shoulder,was "concave" shape.20 m,30m,40 mdifferential subgrade settlement were 0.25 cm,0.428 cm,0.886 cm.With the increase of the content of filling material stone embankment settlement reduced.With respect to the prime soil packing the stone embankment can effectively reduce the settlement.When the content of the stone increased to 30%,reducing the effect of subgrade settlement obviously;As the content of the stone continues to increase,the value of the settlement is still being reduced,but the settlement value decreases to a lesser extent.