Analysis of the Influences on CBR Value of Improved Phyllite as a Fill

doi:10.3969/j.issn.16740696.2017.02.08

Abstract

Abstract: The phyllite as a the raw material was taken from the eastern Ankang section of ShiyanTianshui highway and used in series experiments. The results show that phyllite is a type of weak rock of low strength, poor stability and vulnerable to disintegration and thus cannot be directly used as fill of subgrade of highlevel highway. Phyllite can only be used in subgrade as fill after it is modified. Based on the CBR test results, cement addition and coarse particle grading influenced a lot on CBR value of phyllite. But considering the constraints of economy and engineering properties , through analysis, the mix of cement addition of 3% and coarse particle content of 55% is the optimum combination.

Key words: highway engineering;phyllite, cement modified;gradation;variance analysis theory;CBR

摘要： 选用十堰至天水高速公路安康东段的千枚岩为原材料，进行了一系列的实验。千枚岩属于软岩的一种，强度低、稳定性差且易崩解，不宜直接作为高等级公路路基填料，需要对其进行改性后填筑路基。同时基于CBR测试结果，结合方差分析理论分析了不同水泥掺量与不同粗粒料级配对千枚岩填料CBR的影响。结果表明：水泥掺量与粗粒料级配对千枚岩CBR值影响都比较显著；但在考虑到经济和工程特性要求时，通过分析选择水泥掺量为3%与粗粒料含量为55%级配组合为最佳组合。

关键词: 道路工程, 千枚岩, 水泥改良, 级配, 方差分析理论, CBR

CLC Number:

U416.1

MAO Xuesong, ZHU Fengjie,HUANG Zhe,WANG Liyun，CHEN Yanqin. Analysis of the Influences on CBR Value of Improved Phyllite as a Fill[J]. Journal of Chongqing Jiaotong University(Natural Science), 2017, 36(2): 43-48.

毛雪松, 朱凤杰，黄喆，王莉云，陈燕琴. 改良千枚岩填料的CBR值影响因素分析[J]. 重庆交通大学学报（自然科学版）, 2017, 36(2): 43-48.

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