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| Experimental Study on Improvement of Filling Material for Subgrade of Harbin-Dalian Passenger Dedicated Line |
| WANG Xiao-ming |
| China Railway 13th Bureau Group Corporation, Changchun, Jilin 130033, China |
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Abstract Research purposes：Generally speaking, high-speed railway is very long and its space span is big, so the shortage of the filling materials for the subgrade often does exist in some sections. In order to reduce the construction cost and protect the environment, it is necessary to improve the subgrade filling materials that can not meet the graded requirement in the course of the construction. This research tries to improve the gradation of river pebble with mixing fine-grained soil and fly ash to make the river pebble becoming the qualified subgrade filling material.
Research conclusions：In order to study the feasibility of this method, a lot of tests were done to the tests ample, such as gradation test, compaction stroke test and in-site compacting test. In addition, the different compaction methods were used to the in-site compacting test for seeking a scientific and reasonable compaction technique. The tested result of technique showed this improvement method improved the grained gradation of filling material and enhanced the effective strength and compactness, which could meet the requirement of the code for the filling material. This method not only brought about obvious economic profits, but also brought out the huge social and environment-protective profits.
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Received: 17 September 2009
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2010, Vol. 27 
