中文摘要：

在涵洞-填土-地基共同工作机理基础上,分析了加筋减载法的减载机理。通过理论分析建立了加筋减载涵洞的力学计算模型,推导了格栅所受土压力的计算公式。考虑格栅下部填料的支撑作用,对格栅受力与变形进行分析,推导了格栅在填土荷载作用下的挠度计算式,进而对涵顶松散填料进行受力分析,得到了涵顶土压力的计算表达式。并与有限元计算结果和文献中现场测试结果进行了对比,结果与有限元结果及现场测试结果较为接近,尤其是在填方较高时此方法计算结果更加准确。最后,依据此理论计算方法,对涵顶填土高度、松散填料模量、格栅刚度等影响涵顶压力的主要影响因素进行了参数分析。

英文摘要：

Based on the collaborative working mechanism of culvert-filling-foundation,the load reduction mechanism of a culvert with reinforcement is analyzed.Mechanical model of the culvert with reinforcement is established through theoretical analysis,and the expression of earth pressure acting on geogrid is derived theoretically.Considering the support effect of filling under the geogrid,the stress and deformation of goegrid are analyzed to derive deflection calculation formula of geogrid under load of filling,and then the pressure acting on the top of the culvert is calculated by force analysis.The calculated results by the presented method are in good agreement with those by finite element methods and the field test results recorded in literatures,especially when the fill is high.Finally,based on the presented method,parametric analyses are performed to study the main factors which affect the pressure on the culvert such as embankment height,modulus of loose fillings on the culvert and stiffness of geogrid.