Impact Compaction Technology Applied Research In The Loess Roadbed Construction

Based on the investigation and study of impact compaction technology in civil and abroad, this paper discusses the impact compaction working sections that include XiNing ~ HuangYuan, MaChangYuan~ PingAn , XiNing ~ TaErSi and PingAn ~ADai expressways. Through contrast analysis and generalization of the working sections' test data and aggregate analysis of expressways' test result, this paper studies construction process , construction effect test method and efficiency of loess subgrade construction applied by impact compaction technology in QingHai Province .Conclusions as following have got through test study:(1)When impact compaction technology is applied to treat collapsible loess subgrade, the effect depth may be treated generally can not override 80 cm and impact compaction pass is optimum at 30 times .(2)For stratified impact compaction of subgrade, when compactness of each level reaches codeslstandards loose laying depth of 80 cm fits 40 impact compaction pass is the optimum combination of subgrade construction. When average compactness in each level reaches codeslstandards loose laying depth of 80 cm fits 30 impact compaction pass is the optimum combination o(3)The quality control method may request impact compaction pass as the main control index and at the same time the final division settlement is less than 10% of total settlement as large area subgrade is constructed .(4)If construction organization itself have impact compactor, impact compaction technology compared with traditional construction methods can not only economize on fund but also obviously shorten construction period.