砂砾填筑及土工格栅改善桥头跳车机理研究

The Mechanism of Bridgehead Jump Improved by Gravel Filling and Geogrids

采用有限元计算的方法,分析了桥梁台背回填砂砾和粘土的受力状态的差别;并分析了不同层距土工格栅加筋路堤的受力变形特性。得到以下主要结论:①土体的材质对沉降有十分明显的影响,对于弹性模量、内摩擦角、粘聚力相对较大的砂砾而言,其整体性能比粘土要优良,更适合做路堤填土;②土工格栅加筋作用能够有效减小路堤沉降量,提升路堤的整体性和竖向变形均匀性,且格栅层距越小效果越明显;③格栅有利于改善路面结构和搭板的受力和变形特性,从而延长路面使用寿命。

Finite element calculation method was used to analyze the difference between gravel and clay backfilling bridge abutment, and the deformation characteristics of geogrids reinforced embankment in the different layers distance was analyzed also. The following conclusions can be obtained：①the soil characteristics impacts significantly for embankment settlement, and gravel is a more suitable to be embankment, because of its excellent overall performance than clay, such as larger elastic modulus, internal friction angle, and cohesion; ② geogrids reinforcement effect can effectively reduce the embankment settlement and enhance the integrity and vertical uniformity deformation of embankment, besides, the layer distance is smaller the effect is more obvious ; ③ characteristics of the pavement structure and the slab, geogrids could improve the force and deformation thus extend the pavement life.