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Geomechanics and Engineering Volume 32, Number 6, March25 2023 , pages 601-613 DOI: https://doi.org/10.12989/gae.2023.32.6.601 |
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Experimental study on modified low liquid limit silt for abutment backfill in bridge-embankment transition section |
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Shu-jian Wang, Yong Sun, Zhen-bao Li, Kai Xiao and Wei Cui
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| Abstract | ||
| Low liquid limit silt, widely distributed in the middle and down reaches of Yellow River, has the disadvantages of poor grading, less clay content and poor colloidal activity. It is very easy to cause vehicle jumping at the bridge-embankment transition section when the low liquid limit silt used as the backfill at the abutment back. In this paper, a series of laboratory tests were carried out to study the physical and mechanical properties of the low liquid limit silt used as back filling. Ground granulated blast furnace slag (GGBFS) was excited by active MgO and hydrated lime to solidify silt as abutment backfill. The optimum ratio of firming agent and the compaction and mechanical properties of reinforced soil were revealed through compaction test and unconfined compressive strength (UCS) test. Scanning electron microscope (SEM) test was used to study the pore characteristics and hydration products of reinforced soil. 6% hydrated lime and alkali activated slag were used to solidify silt and fill the model of subgrade respectively. The pavement settlement regulation and soil internal stress-strain regulation of subgrade with different materials under uniformly distributed load were studied by model experiment. The effect of alkali activated slag curing agent on curing silt was verified. The research results can provide technical support for highway construction in silt area of the Yellow River alluvial plain. | ||
| Key Words | ||
| bridge-subgrade transition section; GGBFS; low liquid limit silt; model test; solidified silt; vehicle jumping | ||
| Address | ||
| Shu-jian Wang: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China; Shandong Hi-speed Group CO., Ltd., Jinan 250101, China Yong Sun: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China Zhen-bao Li: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China; Research Institute of New Material and Intelligent Equipment, Shandong University, Dezhou 251100, China Kai Xiao: Shandong Luqiao Group CO., Ltd., Jinan 250021, China Wei Cui: School of Qilu Transportation, Shandong University, Jinan 250002, China | ||