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| Experimental Research on the Proposed Standard for Subgrade Compaction Quality with E，d Evaluation |
| ZHAO Wen1，XIE Qiang1，Yongping Chen2 |
| 1. Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. Imaging GeophysicistCGGVeritas 10300 Town Park Dr.Houston,TX 77072,USA |
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Abstract Research purposes: Evdtest is a new fast and nondestructive testing method for subgrade quality and is widely used in theworld. But to the variety of fillingmaterials used in china railway, no systemic study has been done on the test standard for the subgrade quality withEvd, so the test standard for subgrade quality withEvdhas notbeen worked out 9 typical filling materials are selected for large -scale tests in laboratory. Under different compaction conditions, the ground coefficientK30, degree of compactionK(orvoid ratio n) and dynamic deformationmodulusEvd are tested. Through study of the relation betweenEvdandK30,K, n, the proposed teststandard forsubgrade qualitywith Evdis put forward, and the proposed testing standard is verified by field tes.t
Research conclusions: The proposed valuesof testing standardwithEvdsuitable for"Interim DesignProvisions foraNew 200 km /hMixed Passengerand FreightRailway" are offered. The field verification of the proposed testing standardwith Evdfor subgrade quality presented in this paper is rational and can be as the reference to revising the relative norms.
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Received: 23 June 2009
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2009, Vol. 26 
