原文传递
A frosty reception
| 题名： | A frosty reception |
| 正文语种： | eng |
| 摘要： | Around Christmas last year, certain roads in East Riding were subject to movement, degradation and collapse. Long cracks appeared in the centre of one road, almost as if a mini earthquake had occurred. Before recently moving to East Riding, I worked at City of York council for 25 years and I had never seen anything like this. The only thing I had seen that could compare in terms of damage was a burst utility I worked on once, but, unlike then, in this case there was no clean water pushing through. As the teams started digging to have a look underneath the top surface, we saw a lot of water coming into the holes we were excavating. After some detective work, we started to piece together the most likely explanation - frost heave. The three basic requirements for frost heaving are: 1) a freezing plane in the soil; 2) a fine grain soil through which moisture can move and 3) a supply of water. The frost heave of the subgrade soils occurs due to the formation of an ice lens from an accumulation of moisture in the soil during the freezing period. These ice lenses expand perpendicular to the direction of heat flow and push the pavement up, often causing severe cracking. In some areas of England, a chalk aquifer increases the likelihood of frost heave by retaining water, which can then be drawn to the surface under the right conditions. It can become a key mechanism involved in the high degradation rate of flexible pavement. |
| 出版年： | 2023 |
| 期刊名称： | Highways |
| 卷： | 92 |
| 期： | 5 |
| 页码： | 26-26 |
检索历史
应用推荐
