不同基层类型沥青路面裂缝的长期发展规律

Cracks Long-term Development Law of Asphalt Pavement with Different Base Types

为探讨基层类型对沥青路面裂缝长期发展规律的影响,针对山西某高速公路3种基层类型(柔性基层、半刚性基层、刚性基层)、2种基层厚度(50,55cm)的6段沥青路面试验路,于铺筑后连续4年、加铺后连续4年测定了路面裂缝数目和分布规律的发展情况。结果表明,半刚性基层沥青路面的裂缝数目、开裂面积及其发展速度均明显大于刚性和柔性基层;增加基层厚度可以减少半刚性基层沥青路面裂缝数目和开裂面积,但对于刚性基层和柔性基层路面作用有限;加铺后路面裂缝的发展规律与新建路面相似,加铺对于柔性基层路面意义更大。

In order to determine the effect of base structures on cracks long-term development law of asphalt pavement,the number and distribution of cracks of six test freeways in Shanxi province were investigated.It contains three base types （flexible base,semi-rigid base and rigid base）and two base thicknesses （50cm and 55cm）.The investigating time was four years after construction and four years after overlay.The results showed that：number,area and development speed of asphalt pavement with semi-rigid base were significantly bigger than pavement with flexible base and rigid base.In-creasing thickness of semi-rigid base can reduce the number and area of cracks,but it was limited for rigid and flexible base.Cracks development law of pavement after overlay was similar to new pave-ment.Overlay is more valuable for pavement with flexible base.