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中文摘要：
研究目的：高速铁路沿线距离长,空间跨度大,不少地段路基填料匮乏,为了降低建设成本,保护自然环境,对于施工过程中不能满足级配要求的路基填料,往往需要进行改良。本研究尝试在原河卵石填料中掺加细粒土和粉煤灰的方式改善填料级配,使之成为合格的路基填筑材料。研究结论：为探讨方案的可行性,分别对配制试样进行了级配试验、击实试验和现场压实检测试验,在现场压实试验过程中分别采取不同的压实方法以探讨科学合理的压实工艺。工艺试验的测试结果表明,这种改良方式改善了填料的颗粒级配,有效提高了路基的强度和密实度,能够使填料满足规范要求,不但具有明显的经济效益,还具有较强的社会效益和环保效益。
英文摘要：
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 test sample,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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