砂作为路面材料,由来已久,但一般都是作垫层使用或作基层的掺合料嵌缝料,因砂是一种松散体,若无固定的四侧,顶面是不能承受任何压力的。近年来随着油路的发展,对基层材料的水稳性要求甚严,我省在缺乏石料的江汉平原等地区盛产河砂,利用这种材料作油路基层可以大大降低造价及提高质量,而且施工不受雨季影响,从1974年到现在,我省荆州及黄冈等地区铺筑试验路及扩大试验路十余公里,效果尚好,现有些地、县拟大规模推广,于是要求我们回答以下问题:纯砂作为基层材料,能适应多大的交通量?灰土封面的厚度与什么因素有关,其关系如何? Sand as a pavement material, a long time, but are generally used as a cushion layer or as the base of the admixture seams, because the sand is a loose body, without a fixed four sides, the top is not able to withstand any pressure of. In recent years, with the development of the oil passage, the water stability of the grassroots materials is very strict. The province is rich in river sand in areas such as Jianghan Plain that lack of stone materials. Utilizing this material as the base of the oil road can greatly reduce the cost and improve the quality. And the construction is not affected by the rainy season, from 1974 to the present, the province paved the test road and other areas of Jingzhou and Huanggang more than ten kilometers to expand the test road, the effect is good, some of the existing districts and counties to be large-scale promotion, and asked us to answer the following Question: What is the relationship between the thickness of the lime-soil cover and the factors that affect the amount of traffic that pure sand is used as the primary material?