桥头楔形柔性搭板作用性状的仿真

在分析高等级公路路桥过渡段桥头跳车病害现状的基础上,提出了土工格室楔形柔性搭板处治方法。运用Marc软件,通过模拟地基沉降和桥头脱空区,仿真分析路堤应力和位移的变化规律,研究了楔形柔性搭板处治桥头跳车的作用性状。结果表明,楔型柔性搭板一方面由于其固定于桥台,利用其较大的压拉强度、抗剪强度和大刚度的特性,减小了路堤的应力和地基的附加应力;另一方面楔型柔性搭板具有分散竖向应力和限制路堤侧向位移的作用,从而很好地过渡了桥台与路堤之间的沉降差,消除了桥头跳车现象。

Simulation of active mechanics of wedge flexible approach slab at bridge abutment

On the basis of analyzing the jump disease at bridge abutment in the high-grade highway, the treatment method of the flexible approach slab that is consisted of geocell was put forward. With the help of Marc program, through simulating the foundation condition and loose area under the flexible approach slab, the changed rule of stress and displacement was analyzed, the active mechanics of the flexible approach slab in dealing with the jump was discussed. The result shows that the flexible approach slab can decrease the stress of subgrade and additional stress of foundation because it is fixed on the abutment and it has character of major tensile, shear strength and big stiffness, and that it can disperse stress and restrict lateral displacement to control the different settlement between abutment and subgrade, so the jump disease can be eliminated.