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为了有效预防或减轻青藏公路路基路面的不均匀变形病害问题,大大提高路面的使用性能和行车的安全舒适性,通过前期的现场调研数据结果,分析了青藏公路路基路面不均匀变形的现状和病害机理,在此分析基础上建立对称的路基单元模型为平面应变问题的ABAQUS二维有限元模型。通过ABAQUS有限元模型计算进一步分析了路基路面的横向不均匀变形引起的附加应力,研究了纵向不均匀变形与路基高度、路基填土模量、季节活动层模量、融化区模量及融化区深度的相关关系。最终从结构破坏角度提出了横向不均匀变形处治时的控制指标,从行车舒适性和安全性的角度提出了纵向不均匀变形处治时的控制指标。
In order to effectively prevent or alleviate the uneven deformation and deformation of subgrade and pavement of Qinghai-Tibet Highway, the service performance of pavement and the safety and comfort of driving are greatly improved. Based on the field survey results of the previous period, the present situation and disease of uneven deformation of subgrade and pavement of Qinghai-Tibet Highway are analyzed Based on this analysis, a symmetrical subgrade element model is established as ABAQUS 2D finite element model of plane strain problem. Through the ABAQUS finite element model calculation, the additional stress caused by the transverse inhomogeneous deformation of subgrade and pavement is further analyzed. The effects of longitudinal inhomogeneous deformation and subgrade height, subgrade fill modulus, seasonal active layer modulus, modulus of thawing zone and melting zone Depth of the correlation. In the end, the control indexes for treatment of transverse inhomogeneous deformation are proposed from the perspective of structural failure, and the control indexes for treatment of longitudinal uneven deformation are proposed from the perspective of traffic comfort and safety.