公路路基拓宽结合部工程技术研究

Research into the technology on the joint of roadbed expansion

我国高速公路始建于上世纪80年代，至2007年底，通车里程已接近6万公里，大部分为4车道设计，通车年限在10年以上的占24％，5年以上的占36％。随着我国国民经济的快速发展．早期修建的高速公路的交通量大大增加．双向4车道高速公路已不能满足交通量持续发展的需要，今后一段时间将有许多主干线4车道高速公路加宽成6车道或8车道高速公路。

With the rapid development of China’s national economy, the traffic volume on the expressways constructed early is increased significantly, and the two-way four-driving- lane expressway can’t meet the demand of the sustainable development of traffic volume and many four-driving-lane expressways will be updated to six-driving-lane or eight-driving- lane expressways. But in the expansion rebuilding, the road cracking and even large-area damage may happen if there's uneven sedimentation in the construction of the new roadbed or the joint of the old and new roadbed and solutions to tackle this question shall be seriously studied