基于数值仿真的盐渍土路面结构力学响应分析

Analysis on Mechanical Response of Saline Soil Pavement Structure Based on Numerical Simulation

摘要:

对以碳酸盐渍土作为路基的路面结构进行力学响应分析，选取沥青路面和水泥混凝土路面两大类路面类型，分别建立路面结构力学响应分析模型，研究采用0~30 cm（工况1）以及30~80 cm（工况2）厚的加入不同石灰掺量改良后的碳酸盐渍土作为路基的路面结构在车辆荷载作用下的力学响应。结果表明：在沥青路面中，随着路基中石灰掺量的增加，2种工况下的竖向变形呈现先减小后增大的趋势；当石灰掺量为5%时，工况1和工况2下的竖向变形分别为1.35 mm和1.51 mm，相较于不掺石灰的情况分别减小了30.13%和17.89%；石灰掺量达到20%厚时，其对2种工况的变形和应力变化的影响基本相等。

关键词:盐渍土;路基;路面;力学响应;数值仿真

Abstract:

The mechanical response of pavement structure with carbonated soil as subgrade is analyzed. Aiming at two pavement types of asphalt pavement and cement concrete pavement, the mechanical response analysis models of pavement structures are established respectively to study the mechanical response of pavement structure under vehicle load by using the carbonate soil with a thickness of 0~30 cm (working condition 1) and 30~80 cm (working condition 2) with different lime content as the subgrade. The conclusion shows that in asphalt pavement, with the increase of lime content in the subgrade, the vertical deformations of the two working conditions show a trend of first decreasing and then increasing. When the lime content is 5%, the vertical deformations under the working condition 1 and working condition 2 are 1.35 mm and 1.51 mm respectively, which are reduced by 30.13% and 17.89% compared to not adding lime. When the lime content reaches 20% thickness, the impact on the deformation and stress changes of the two working conditions is basically equal.

Key words:saline soil;subgrade;pavement;mechanical response;numerical simulation