Filling technology research for high liquid limit soil roadbed(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年01期
- Page:
- 44-50
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Filling technology research for high liquid limit soil roadbed
- Author(s):
- DAI Liang-jun; ZHU Da-yong
- School of Civil Engineering, Hefei University of Technology, Hefei 230001, Anhui, China
- Keywords:
- road engineering; high liquid limit soil; improved by sand; water content; compaction degree; CBR; compaction times
- PACS:
- U416.1
- DOI:
- -
- Abstract:
- To solve engineering problems of compaction difficulty and poor water stability of high liquid limit soil when it was directly used as subgrade filling, the relationship among several parameters of compaction degree, water content, compaction times, and CBR value before and after sand improvement was studied though California bearing ratio test and field rolling test. The change rules were analyzed from two aspects of intensity attenuation and expansion deformation. The results show that compaction degree first increases greatly and then decreases slightly with increasing of compaction times, and water content at maximum CBR value is generally greater than optimal water content. CBR value of high liquid limit soil are controlled by water content and degree of compaction, but the influence of water content on CBR value is more significant than that of compaction degree. Different level of inflation leads to different characteristics of CBR value of high liquid limit soil before and after sand improvement. High liquid limit soil can be used as direct filling material in the upper embankment while water content should be controlled during the range of 2.0% lower and 2.0% higher than the optimum water content after using the surrounding conduction and reducing the standard of degree of compaction. High liquid limit soil modified by 20% sand can be used in upper and lower embankment after water content is controlled during the range of the optimum water content and 6.0% higher than the optimum water content.
Last Update: 2016-01-29