Abstract: Xigeda soil as roadbed filling was studied in the paper． The influence of moisture content，gradation composition， effect of construction process on degree of compaction was studied． The results demonstrated that: degree of compaction was the best as the moisture content of Xigeda Filling was 12% ～ 17%; Cu and Cc of Xigeda Filling could meet the needs before and after compaction，therefore it was a good-grading filling; loose laying depth of Xigeda Filling was 30cm ～ 35cm under 16T road roller rolling and 35cm ～ 40cm under 18T road roller rolling; higher degree of compaction was achieved when firstly applying strong vibration and then weak vibration with road roller; it should be compacted six times with 16T road and five times with 18T road roller．

Key words: Xigeda Filling, moisture content, gradation composition, construction process, degree of compaction

摘要： 以昔格达土作为路基填料，进行了该填料的含水量、颗粒级配、施工工艺对压实度影响的相关性试验。试验 结果表明:昔格达土填料含水量在12%～17%之间时，路基的压实效果最佳;压实前后其Cu和Cc均满足要求，昔 格达土填料是一种级配好的填料;16t压路机碾压方式下适合昔格达土填料的松铺厚度为30～35cm，18t压路机 碾压方式下为35～40cm;2种压路机均以采用先强振后弱振的碾压方式压实度效果较好;16t压路机最佳的碾压 遍数为6遍、18t压路机为5遍时，效果最好。

关键词: 昔格达土填料, 含水量, 颗粒级配, 施工工艺, 压实度