土包砂路基施工技术应用分析

土包砂路基是指路基的中部用砂填筑，两侧用具有一定宽度和顶面一定厚度的定塑性指数的土包围填筑而成型的路基。结合哈尔滨绕城公路东北段土包砂路基施工的现场资料，按照施工规范要求和规定，对哈尔滨绕城公路东北段土包砂路基施工技术中影响压实度因素进行了比较分析，通过分析发现：（1）随着碾压编数的增多，压实度提高不明显；（2）松铺高度对压实度有很大的影响，当松铺高度接近28em时，压实度最大；（3）压实度随着含水量的增加而增大，当达到13％时，压实度随含水量的增加趋于平稳。

Analysis on Construction Technology Application of Soil Sand Subgrade

Soil Sand Subgrade is the subgrade which was filled with sand in the middle and surrounded by the soil of the plastic index with a certain width and thickness of the top on both sides. According to the construction specifications and regulations, the factors afffected compaction of the soil sand subgrade construction were compared and analyzed in the Ring Road northeast section of Harbin. The analysis results showed that （ 1 ） with the increasing of the number of rolling code, the compaction was not improved obviously, （2） soft paving height had a great impact on the soil compaction and the compaction reached the maximum degree while the soft paving height was up to 28 cm high, （ 3 ） the degree of com- paction became large with the addition of water content and the compaction stabilized with the increasing of water content when it reached 13%.