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针对现有理论方法没有考虑涵侧的外土柱体所受附加压力对涵顶垂直土压力的影响的问题,根据涵洞和填土实际受力状态,改进现有的涵顶垂直土压力计算理论方法,推导出涵洞垂直土压力计算式.将改进理论方法的计算结果、数值模拟和现有的试验结果进行对比,验证了改进理论方法的正确性.研究结果表明:涵顶铺设柔性填料能明显减小涵顶垂直土压力,涵顶土压力集中系数随填土高度、涵顶和涵侧填土变形模量、柔性填料厚度的增大呈非线性减小,随柔性填料变形模量的增大呈非线性增加,但最终均趋于稳定.
In view of the fact that the existing theoretical methods do not consider the influence of the additional pressure on the culvert on the vertical earth pressure on the culvert, the existing theory of vertical earth pressure on the culvert should be improved according to the actual state of the culvert and earth filling Method to derive the calculation formula of the vertical earth pressure on the culvert.Comparing the calculated results of the improved theoretical method with the existing experimental results to verify the correctness of the improved theoretical method.The results show that: With the decrease of the vertical earth pressure at the culvert, the concentration coefficient of the culvert pressure decreases nonlinearly with the filling height, the deformation modulus of the culvert and the culvert, and the increase of the thickness of the flexible packing. With the increase of the modulus of deformation of the flexible packing Large non-linear increase, but eventually stabilized.