Settlement Calculation Method And Control Measure After High Embankment On Steep Slope

In the Fujian region,high-steep slope embankment with high filling height,complex fillers,and steep slopes has been formed due to the valley ravines.Compression creep properties of embankment fillers,calculation methods for post-construction settlement of embankments and control measures for post-construction settlement,there are still some issues that need further study.This paper studies the creep characteristics of high embankment fillings on typical steep slopes in Fujian Province,the regularity of post-construction settlement of embankments with different steep slopes,steep slope high embankment measured settlement predicting method,post-construction settlement simplification formula,steep slope high embankment settlement control technology after construction.The main conclusions are as follows:1.A case study of typical filling and soil-rock mixed in Zhangzhou Section of Xiarong expressway,compression creep experiment,describe creep characteristics of filling material and soil-rock mixed filler by using power function and logarithmic function creep equation;and separately calibrate the creep parameters of filling materials and soil-rock mixed fillers.2.Extended D-P and creep coupled constitutive model was used to analyze the numerical analysis of the 2D and 3D shut-off type and wide-mouth type soil steep fill high embankment model show:embankment settles at 20 years and tends to stabilize;fully-filled embankment model displacement with a height of 40m,from the largest to the smallest are 2D,3D shut-off type and 3D wide-mouth type;fully filled 30m and 40m semi-digging and half-filled embankment models with a height of 30m,from the largest to the smallest are 2D,3D wide-mouth type and 3D shut-off type;get the formula for estimating the post-construction settlement and filling of roads under 2D conditions.3.Linear viscoelastic constitutive model was used to analyze the 2D and 3D shut-off type and wide-mouth type soil-rock mixed steep slope high embankment model,the results show:the embankment settles basically stable at 1000 days;displacement of fully filled and half-filled embankment model,from the largest to the smallest are 2D,3D shut-off type and 3D wide-mouth type;get the formula for estimating the post-construction settlement and filling of roads under 2D conditions.4.Based on a large number of settlement data analysis,poisson curve,hyperbola,logarithmic curve,power curve and exponential curve can all predict the measured settlement,the poisson curve is the most suitable,analysis and prediction of measured settlement data of a monitoring section of Xiarong expressway using the poisson curves.5.Based on the empirical formula for the evaluation of the settlement of high-fill embankments at home and abroad,through a large number of measured high fill data regression analysis,proposed new simplified formula for post-construction embankment settlement and verification.6.For a certain foundation condition,the engineering example of bedrock is used to calculate the settlement by three methods and compared with the measured data,the precision is in turn numerical calculation method,curve fitting method and simplified formula.7.The finite element analysis of three post-construction settlement control measures can known:for 2D and 3D soil-rock mixed fillers steep slope high embankment,the control effects of post-construction settlement of fully filled and half-filled embankment are powerful technology,geogrid technology and retaining wall technology;for 2D and 3D filling materials steep slope high embankment,the control effects of post-construction settlement of fully filled and half-filled embankment are geogrid technology,powerful technology and retaining wall technology;geogrid technology has better effect on the horizontal displacement of embankment filled with soil than that of embankment soil-rock mixed filler.