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有人以为用砂土做路堤总觉得不大可靠,其实是一种错觉。苏联公路路基施工技术规范中曾经提到:“透水性良好的土壤准用以修筑路堤,不受任何限制。”又说:“路堤上层应使用不因潮湿及冻融而变更其体积的优良土壤。”优良土壤即指砂及近于最佳级配的粗粒砂土质(土户)坶。其所以提倡用砂做路堤之主要原因为可增加路堤的稳定性。由于采用了这种优良土壤做路堤,还可相应地减薄路面厚度,节省路面工程费用。在容易获得砂、砾的地段,实有尽量采用的价值。祖国有许多地方,河中冲积着无穷无尽的砂、砾,河岸则为高产值的农地,我们把河中砂、砾填筑路堤,既可以少挖农田,减征用地,还可以结合水利上的要求,开挖一部份河道。
Some people think that embankment with sand always feel not reliable, in fact, is a delusion. It has been mentioned in the technical specification for roadbed construction of the Soviet Union that “a well with good water permeability shall be used for embankment construction without any restrictions.” He added: “The upper embankment should have excellent soil that does not change its volume due to moisture and freezing and thawing ”Fine soil refers to the sand and near the best graded coarse sand soil (soil) 坶. Therefore, the main reason for promoting embankment with sand is to increase the stability of the embankment. As a result of this excellent soil embankment, but also a corresponding reduction in thickness of the road, save on pavement costs. In the easy access to sand, gravel lots, the actual use of the value as much as possible. There are many places in the motherland, where endless alluvial sand and gravel are alluvial in the river and high-value agricultural land is in the river bank. We can fill the embankment with sand and gravel in the river so that we can cut less farmland, reduce land requisition, and combine water conservancy Request, excavation of part of the river.