摘要
通过兰新高速铁路第二双线路基试验段戈壁土现场填筑试验及室内土工试验,研究了戈壁土的颗粒组成、颗粒级配、粗颗粒含量P5、细颗粒含量、含水率控制对压实效果的影响。结果表明,对于高速铁路路基填料,其不均匀系数:基床以下路堤Cu≥15、基床底层Cu≥20为宜;随着填料中粗料含量P5的增大,填料的干密度增大,当粗料含量在70%左右时达最大;含水率大小对粗粒土的压实效果的影响,主要由填料中细粒含量(d≤0.075 mm)的多少而定。
Through site filling test and indoor geotechnical test of desert soil in the second double-line section of Lanzhou-Xinjiang High-speed Railway,the influence of grain composition,graduation,coarse particle content P5,fine particle content and water content on compaction effect are studied.The results show that the uniformity coefficient Cu of high-speed railway subgrade filling should be no less than 15 for the embankment below subgrade bed and 20 for base course.Dry density of filling increases with the content of coarse particles P5.When the content of coarse particles is 70 %,dry density is the maximum.The influence of water content on compaction effect is mainly determined by the content of fine particles（d≤0.075 mm）.
出处
《路基工程》
2011年第4期31-33,36,共4页
Subgrade Engineering
基金
铁道部科技研究开发计划(2009G020-C)
关键词
戈壁土
粗粒土
高速铁路路基
填料颗粒组成
含水率
desert soil
coarse-grained soil
high-speed railway subgrade
filling composition
water content
