针对多年冻土地区的宽幅公路路基变形及稳定性模拟分析

Simulation Analysis of the Deformation and Stability of Wide Highway Subgrade in Permafrost Regions

针对多年冻土层地区公路路基易发生沉降变形、裂纹等问题。以某工程项目为对象,通过现场实测数据和有限元法建立不同温度场合宽幅下的公路路基模型,分析公路路基的变形、位移状态。研究结果表明:随着温度降低,宽幅复合式基层路面结构的路基高温区和0℃冻结线逐渐下移,在11月份的路基整体结构层均处于冻结状态,低温作用下导致结构脆性增加,易产生开裂。宽幅复合式基层路面具有显著的"吸热、保温"效应,在路基内部形成范围较大的高温区,导致多年冻土路基结构稳定性下降,在水、热和交通荷载作用下产生结构变形和路基沉降明显大于窄幅基层路面,因此在实际施工过程中,采用窄幅公路路基具有更高的结构稳定性。

highway roadbed in permafrost area is prone to settlement, crack and so on. Taking a project as an object, the road roadbed model under different temperature and width is established by field measured data and finite element method, and the deformation and displacement of highway subgrade are analyzed. The results show that with the decrease of temperature, the embankment high temperature area and freezing line of wide width composite base pavement structure gradually move down, and the whole structure layer of roadbed is frozen in November, which results in the increase of structural brittleness under the action of low temperature. It is easy to crack. The wide compound base pavement has obvious "heat absorption, heat preservation" effect, and it is in the subgrade.The structure stability of permafrost subgrade decreases, and the structural deformation and subgrade settlement under the action of water, heat and traffic load are obviously larger than that of narrow base pavement, so in the actual construction process, The use of narrow road subgrade has higher structural stability.