公路路基回弹模量承载板测试方法改进研究

Research on Ameliorative Method for Testing Subgrade Rebound Modulus by Bearing Plane

针对承载板测试方法的不足,在进行路基顶面应力和位移分析的基础上,选择甘肃省、河南省和河北省的4条不同等级代表路段进行了不同荷载标准下的承载板试验,提出了不同等级公路路面结构下路基顶面产生的回弹弯沉以及压应力的变化范围;分析得出在不同等级公路进行承载板试验时的荷载标准:对于高等级公路(二级以上),荷载标准一般取为回弹变形0.5 mm对应的应力;对于三级以下公路,则采用控制回弹弯沉到1 mm时结束;同时提出了采用控制应力的测试方法,针对不同等级道路采用不同加载上限及荷载分级方法。

Aiming at many shortcomings in bearing plane testing method and on the basis ot analyzing stress and displacement on top of subgrade, this paper chooses four typical roads of Gansu Province,Henan Province and Hebei Province to do bearing plane experiments at different load Standards; presents the variation range of rebound deflection and compressive stress generated on subgrade surface in different scale highway pavement structure; concludes the load standards for bearing plane tests on highways of various levels： regarding high grade highway （second grade above）,loads standard commonly derives as the corresponding stress of rebound distortion 0. 5 mm, and regarding the highway following third class,then adopts controling rebound deflection to lmm; at the same time, puts forward the testing method of controling stress,coping with different scale road, adopts different loading upper limit and loads stage division.