低液限粘土路基的现场试验

Field test of low liquid limit clay subgrade

结合靖边—延安高速公路工程实际及大量的现场试验结果，分析了低液限粘土路基的施工工艺、质量控制要点及现场试验方法，并对低液限粘土压实的机具选择、路堤填土合理分层厚度、压实质量控制和检测技术进行了研究。结果表明：选用虚铺厚度为30cm、填土含水量（质量分数）超过最佳含水量＋1％左右时，采用振动羊脚碾碾压6～7遍、20t振动压路机振压4～5遍、静压1遍收面，土层内各分层压实度均已达到要求，压实效果最佳；低液限粘土是路堤施工的适宜填料，可在其普遍存在地区充分利用。

Based on engineering practice of Jingbian-Yan＇an freeway and a large amounts of field experimental datum. The paper discussed the construction craft, quality control, the field test means of low liquid limit clay, studied the machines choice for the compaction of the clay, the reasonable laminated thickness of roadbed filling, the compaction effect control and the measuring technique. The results of show that the reasonable laminated thickness of roadbed filling is 30cm, the water content of roadbed filling is more ＋1% than the optimal water. The number of rolling by sheep-foot roller is about six or seven times, the number of rolling by 20 t vibrating roller is about four or five times, the static surface compactness; This notes that the low liquid limited clay is the appropriate filler of embankment construction, and should be fully utilized in its plentiful area. 4 tabs, 10 figs, 8 refs.