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依托岢临高速公路,选取一填土高度为39.2m的超高填方路堤试验段,建立了FLAC3D数值分析模型,分析填筑过程中黄土地区超高填方加筋路堤作用机理。采用分级加载的方式模拟路堤的填筑过程,对路堤边坡坡脚、坡顶及变坡点等位置的沉降、水平位移和格栅轴力的变化规律进行监测分析。结果表明:路堤沉降随着填土高度增加而逐渐增加,且路堤中部沉降相对较大;路堤水平位移随填土高度增大而逐渐减小,且其方向逐渐由正向变为负向,路堤坡脚附近水平位移相对较大;路基横断面方向上的土工格栅轴力在一定长度范围内为零,此后呈先增大后减小的抛物线形变化,且格栅上覆填土高度越大,格栅轴力越大。
Based on the Yinglin expressway, a test section of embankment with embankment height of 39.2m was selected to establish FLAC3D numerical analysis model to analyze the mechanism of embankment reinforced by ultra-high embankment in loess area during filling. The grading loading method was used to simulate the filling process of embankment. The settlement, horizontal displacement and grid axial force variation of slope foot, slope top and slope changing point of embankment were monitored and analyzed. The results show that the settlement of embankment increases with the increase of fill height, and the settlement of the middle part of embankment is relatively large. The horizontal displacement of embankment decreases with the increase of fill height, and its direction gradually changes from positive to negative. The horizontal displacement near the foot of the slope is relatively large; the axial force of the geogrid in the direction of the cross section of the embankment is zero within a certain length range, and then increases parabolically first and then decreases; Large, grille axial force greater.