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甘肃西部位于蒙新沙漠及青藏高原的接触地带,东部为黄土高原,境内多山,地形复杂。各地区气候差异悬殊,土质复杂,随地区差异呈现带状分布的规律。在全省公路中,主干经约占五分之一,路基填土高度一般低于现行规范要求,夯压也不够密实,路面多系通过养护逐年加铺砂砾材料所形成,每次铺的厚度较薄,在行车作用下,多数老路的路基顶部形成10～20厘米厚的硬层,强度多在600公斤/平方厘米以上。有些路段的路基路面亦无截然划分的界限,路面厚度很不一致。另外,路面材料规格零乱,结构强度不匀,级配不好,大颗粒多,粘结力低,以致路面平整度差。所有这些因素对于搓板的产生都有一定的影响。
The western part of Gansu is located in the contact zone between Mongolia and Xinjiang and the Qinghai-Tibet Plateau. The eastern part of the Gansu Plateau is a loess plateau with mountainous terrain and complicated terrain. The regional climate disparities, soil complexity, with the regional differences showed a banded distribution of the law. In the province’s highway, the backbone of about one-fifth, the subgrade fill height is generally lower than the current standard requirements, ramming pressure is not enough dense, multi-pavement by paving gravel material maintenance pavement year after year, the thickness of each shop Thin, under the action of traffic, most of the old roadbed top to form a hard layer of 10 to 20 cm thick, more than 600 kg / cm2 in intensity. There are also some sections of subgrade and road surface without clear boundaries, the road thickness is very inconsistent. In addition, the pavement specifications messy, uneven structural strength, gradation is not good, large particles, low adhesion, resulting in poor road surface roughness. All of these factors have a certain impact on the production of washboards.