交通荷载作用下低路堤累计永久变形试验研究

Experiment Research on Permanent Strain Accumulation of Low Embankment under Traffic Load

采用低路堤高速公路设计方案时,交通荷载会对路基的应力和变形产生较大的影响。文章通过破坏轴向应力试验与累积永久应变试验,模拟了交通荷载对路基的循环作用,研究了不同频率、不同围压、不同应力水平下交通荷载引起的路基变形特征,提出交通荷载作用下低路堤产生沉降的主要因素,供低路堤的设计和处理参考。

When adopting low embankment design method in the expressway, the effects of traffic load on the deformation and tress of the subgrade are large. Through failure axial stress test and cumulative permanent strain test, this paper simulates circulation effect of traffic load on subgrade, studies distortion characteristics of subgrade caused by traffic load with different frequencies, different confining pressure and different strain level. The major reasons for low embankment settlement under traffic load are given, which could be taken as reference for design and dispose of low embankment.