Rapid On-Site Improvement of Over-Wet Fluvioglacial Deposits Filler for Highway Subgrade Construction
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-2223-3
Geotechnical Engineering
Rapid On-Site Improvement of Over-Wet Fluvioglacial Deposits Filler for Highway Subgrade Construction Cheng Luoa, Mingjing Fang
b
, Shicong Zhaia, Xiangping Oua, and Yang Pua
a
School of Transportation, Wuhan University of Technology, Wuhan 430063, China School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
b
ARTICLE HISTORY
ABSTRACT
Received 5 December 2019 Accepted 14 June 2020 Published Online 4 September 2020
The compaction of over-wet fluvioglacial deposits filler is difficult due to its high moisture content. This paper presents an easy but effective improvement method to treat over-wet fluvioglacial deposits using quicklime. Firstly, several tests are conducted to figure out the properties of the over-wet fluvioglacial deposits. Then, the relationship curves between the difference of natural-optimal moisture content and compaction degree are established. Finally, field test is carried out and the compaction degree of the subgrade soil is evaluated by sand cone method. The field test in the case study shows that the moisture content difference of filler is 10.9%, and the optimal quicklime content is 6% according to the curves. Results indicate that the average compaction degree of subgrade soil is 94.90% (>93%) and the value of CBR is much higher than required 3%, which proves that the method using quicklime works well to improve over-wet fluvioglacial deposits filler for rapid construction of highway embankment. Considering the inadequacy of stiffness of quicklime-treated filler, the rapid increase of stiffness for the upper roadbed using over-wet fluvioglacial deposits filler needs further research.
KEYWORDS Subgrade engineering Fluvioglacial deposits filler Moisture content Rapid improvement construction Field evaluation
1. Introduction Subgrade is the connecting element between foundation and pavement, which directly influences the long-term stability of highway. The properties of subgrade mainly depends on the filler’s characteristic. Fluvioglacial deposit is a special and widely distributed subgrade filler in southwest China. Due to long-term washing, handling and depositing, fluvioglacial deposits are poor-gradated with uniform particles. Moreover, the soil being as subgrade filler is low-intensity and extremely difficult to get compacted because of its relatively high natural moisture content. Thus, the soil is not a proper subgrade filler unless treated effectively. In recent years, the need for the highway construction is increasingly urgent as the economy and total population local expends. Therefore, it is economical to use the fluvioglacial deposits filler for subgrade construction when the treated glacial soil can ensure the long-term stability and durability of highway subgrade. Fig. 1 shows the distribution in Chengdu plain (Sichuan Bureau of Geology and Mineral Resources, 1979) and the typical view of fluvioglacial deposits on
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