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(一)波浪出现和车辆密度及速度有关。所以首先应该注意到回沙次数和车辆通过数量是否相适应。如车辆密度大,回沙次数跟不上,那么就会出现波浪。根据一般经验,大致每通过了100车次,就必须回沙一次。 (二)由于路段情况不同,车辆行驶的速度不可能是一致。在车速大的路段,波浪出现机会较多,车速受到限制的路段,波浪出现机会就少。因此像凹形竖曲线地段就比凸形竖曲线地段容易出波浪。在这些容易出现波浪的地段,我们应该适当增加回沙次数。
(A) Waves appear related to vehicle density and speed. Therefore, we should first notice whether the times of sand return and the number of passing vehicles are compatible. Such as vehicle density, back to the sand can not keep up, then there will be waves. According to the general experience, it is necessary to go back to the sand once every passing of 100 train trips. (B) Due to the different road conditions, the speed of vehicles can not be the same. In the section with large speed, there are more chances for the wave to appear and the speed limit is limited. Therefore, like the vertical section of the concave curve than the vertical curve of the convex section prone to waves. In these areas prone to waves, we should appropriately increase the number of backslides.