ABSTRACT
ABSTRACT: The cavities under the asphalt pavement cause unexpected collapse accidents due to repeated traffic load or the influence of temperature. So, the early detection and rapidly repair of cavities under the pavement are essentially to ensure the safety of user. In the usual case, the cavity is often found around the underground structure. The mechanism of cavities under the pavement has been investigated from site to site based on ground conditions and influence of the underground structure. But the detail mechanism is not well known.
