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为了完善桩承式加筋路堤中土工格栅应变的计算方法,在德国规范EBGEO的基础上,考虑桩帽及土工格栅刚度对格栅应变计算的影响,提出考虑等效桩径系数的修正计算方法,同时依托桩承式路堤现场试验,监测记录了路堤沉降、桩土压力和格栅应变的变化规律,并将实测结果与计算结果进行了对比。研究结果表明:格栅类型对路堤填筑期沉降影响不显著;桩土间的荷载传递随着格栅模量的增大而得到进一步加强;路堤荷载传递形式因采用不同类型的格栅而存在差异;填筑期内钢塑格栅应变随路堤填筑高度的增大而增加,且观测到了徐变性;钢丝格栅在填筑期内的应变变化不明显,但在填筑期结束后观测到了应变突变现象。通过现场试验与理论计算结果的对比,验证了采用等效桩径系数法计算格栅应变的合理性,并建议当采用钢丝格栅等高强刚度格栅时,可采用考虑等效桩径系数的修正EBGEO法进行格栅应变与应力计算。
In order to improve the calculation method of geogrid strain in piled reinforced embankment, on the basis of German standard EBGEO, considering the effect of pile cap and geogrid stiffness on the calculation of geogrid strain, the correction of equivalent pile diameter coefficient Based on the on-site test of pile-supported embankment, the variation rules of embankment settlement, pile-soil pressure and grating strain were recorded and recorded. The measured results and the calculated results were compared. The results show that: the type of grille has no significant effect on the settlement during the embankment filling period; the load transfer between pile and soil is further strengthened with the increase of the modulus of embankment; the load transfer forms of embankment exist due to different types of grille The strain of steel-plastic grid increases with the increase of embankment filling height during the filling period, and the creep is observed. The strain of steel grid during filling period is not obvious, but after the filling period, To the phenomenon of strain mutation. Through the comparison between the field test and the theoretical calculation, the rationality of using the equivalent pile diameter coefficient method to calculate the grid strain is verified. It is suggested that when using the high-strength grating such as steel wire grid, Correct the EBGEO method for grid strain and stress calculation.