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纵向裂缝是北方寒冷地区道路结构的重要灾害之一,它严重的影响了路面结构的性能和功能。该文基于扩展有限元方法对于路面在发生不均匀土基沉降时纵向裂缝的扩展进行了研究,通过数值模拟对比发现,虽然重载荷导致了纵向裂缝产生,但是实际控制路面纵向裂缝产生与发展的是土基的沉降量和路面结构的边界约束。同时该文使用了一种弹性模量衰减的方式模拟了土基随时间的不均匀沉降,通过这一方法,可以将土基随时间的沉降量转化到力学计算当中。该文研究成果为预测路面纵向裂缝扩展提供了一种工程参考。
Longitudinal cracks are one of the major disasters of the road structure in the cold northern area, which seriously affects the performance and function of the pavement structure. In this paper, based on the extended finite element method, the longitudinal crack propagation in the pavement under uneven soil foundation settlement is studied. The numerical simulation shows that although the longitudinal cracks are caused by the heavy load, the actual longitudinal cracks in the pavement are controlled and developed Is the settlement of the soil foundation and pavement structure boundary constraints. At the same time, this paper uses a method of elastic modulus attenuation to simulate the uneven subsidence of soil foundation over time. By this method, the settlement of soil subgrade over time can be transformed into mechanical calculation. The research results provide an engineering reference for predicting longitudinal crack propagation in pavement.