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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。
Based on the analysis of the stresses and displacements on the top surface of roadbed, four different grades of representative sections of Gansu, Henan and Hebei provinces were selected to test the load-bearing plates under different loading standards. The springback deflection and the range of compressive stress caused by the top surface of roadbed under different grades of highway pavement structure are analyzed. The load criteria are obtained when the bearing plates are tested on different grades of highway: For the high-grade highway (level 2 and above), the load standard Generally, it is taken as the stress corresponding to the springback deformation of 0.5 mm; for the road below the third grade, the control deflection ends when the deflection is 1 mm; at the same time, a test method of controlling the stress is proposed. Different loading limits are adopted for different grades of roads Load classification method.