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Technique experiment using Xigeda stratum as expressway subgrade materials

ZHOU Hong-fu1,NIE De-xin2,ZHONG Hua-jie3 1.Chengdu Center of China Geological Survey,Chengdu 610081,China; 2.State Key Laboratory of Geo-hazard Prevention & Geo-environment Protection,Chengdu University of Technology,Chengdu 610059,China; 3.Chengdu Institute of Geo-environment Monitoring,Chengdu 610041,China  
The article researches the optimum technique of construction using the especial Xigeda stratum as roadbed fillers of an expressway by using the compaction degree,CBR,resilience modulus and deformation modulus,and based on the Xichang-Panzhihua expressway and a lot of test results.The optimum loose paving thickness is 30~35 cm.The optimum mode of compaction is from strong vibration to weak vibration.The optimum number of compaction is 5~6.The article researches the correlation between the indoor saturated CBR and non-saturated CBR based on a large number of experiment results.The results indicate that the correlation is very good and correlative coefficient is 0.966.It can shorten the time of strength test for the Xigeda fillers.
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