主要是由于局部凹陷在冲击瞬时就消耗了大量能量的缘故。
The cause is that during the course of local dent, a large amount of energy is dissipated at the moment of impact.
项目道路沿线普遍的路面破坏类型有车辙、沟壑、碎石、路面脱落及纵向间隔侵蚀、坑洼及局部凹陷等。
The prevalent pavement distress types along the project road are rutting corrugation stoniness and raveling and at intervals longitudinal erosion potholes and local depressions etc.
实验研究与数值模拟结果表明，砂垫平铺圆管的横向冲击变形主要为冲击点局部凹陷，结构的整体弯曲变形可以忽略。
The results show that the displacements of the procumbent circular tube under lateral impact are mainly local depression around the impact point and the global deformations can be neglected.
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