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POTHOLES IN FLEXIBLE PAVEMENTS
| 题名： | POTHOLES IN FLEXIBLE PAVEMENTS |
| 正文语种： | eng |
| 作者： | P. M. DESHPANDE |
| 摘要： | The paper discusses reasons of potholes development in flexible pavements and measures to be taken to prevent their formation. It examines flaws in mechanistic models being used for designing of flexible pavement. Wary of potholes, CIDCO had carried out some experimentation in design and construction of flexible pavements in order to prevent damages to roads. On the basis of the outcome of the experiments, the author have noticed some inadequacies in modeling of pavement mechanism presently being used as basis of design. The major inadequacy is seen in ascribing value of Resilient Modulus to unbound layers of flexible pavements. It is difficult to imagine elastic recovery of strain caused by wheel load in unbound layers of the pavement. In practice the recovery is caused by further movement of wheel load. So it is proposed to term it as Virtual Resilient Modulus (VRM) instead of Resilient Modulus for Granular base and Sub-base. The VRM takes in to consideration contribution of moving wheel load to recovery of pavement strain resulting from wheel load. It has the potential of making the design fully analytical using design inputs of loading and speed of traffic, inter-granular friction, environmental variations in material properties, etc. It also suggests need to make use of HDPE geo-grids to ensure smooth functioning of the mechanism in extreme environmental conditions like temperature variation, rainfall, weak sub-soil, flooding, presence of other services etc in the design for pothole free roads. |
| 出版年： | 2021 |
| 期刊名称： | Indian Highways |
| 卷： | 49 |
| 期： | 2 |
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