论文部分内容阅读
根据已有的涵土体系相互作用机理,在原涵洞上加减载块,形成一种新的涵洞结构。并在此结构上对土工格栅加筋减载机理进行分析,得到格栅加筋减载作用下涵洞顶部土压力的计算表达式,然后通过数值模拟对涵顶土压力进行参数分析。研究结果表明:(1)有减载块的加筋减载模型的理论值与有限元值比较接近,误差在10%以内,表明了理论计算结果的正确性;(2)减载块高度对涵顶土压力有显著影响,且随减载块高度增加其影响效果减弱;(3)受筋材特性影响,减载块宽度对涵顶土压力的影响不明显;(4)柔性材料压缩模量对涵顶土压力和格栅变形有较大影响,且模量取值也宜适中。
According to the existing interaction mechanism of culvert system, add or reduce load blocks on the original culvert to form a new culvert structure. And on this structure, the mechanism of geogrid reinforcement loading and unloading is analyzed, and the expression of earth pressure at the top of culvert under the effect of grid stiffener and load shedding is obtained. Then, the parameters of the culvert earth pressure are analyzed by numerical simulation. The results show that: (1) The theoretical value of the model with and without load block is close to the finite element value, the error is within 10%, which shows the correctness of the theoretical calculation results; (2) The influence of culvert top pressure is significant, and the effect is weakened with the increase of shedding block height; (3) The influence of tendon properties on the pressure of culvert roof is not obvious; (4) The amount of soil pressure on the culvert and deformation of the grille have a greater impact, and modulus values should also be moderate.