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| DOI：10.13522/j.ggps.cnki.20180230 |
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| Efficacy of Four Consolidation Agents in Improving Mechanical Properties of Salinized Foundation Soil of Channels |
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LI Hongbo , TIAN Juncang , NAN Hongbing , XU Dibing , GU Haitao
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1.College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2. Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation, Yinchuan 750021, China; 3. Engineering Research
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| Abstract: |
| 【Objective】 This paper presents an experimental study on the efficiency of four consolidation agents in improving mechanical properties of salinized foundation soil of channel.【Method】 The four consolidation agents we considered were cement, fly ash, silica fume and magnesium slag. For each agent, we designed three soil amendments based on the orthogonal test. Following the amendment, we progressively measured the properties of the amended soil using triaxial, compression and shrinkage test.【Result】 Compared to the original soil, the cohesion and fictional angle of the solidified soil could increase up to 2.97 times 3.78 times respectively 7 days after the amendment, and up to 4.81 times 5.84 times respectively 28 days after the amendment. After five freeze-thaw cycles after 28 days, soil without amendment collapsed, while the solidified soils still had their cohesion increase by 5.1%~23.1% and frictional angle by 0%~25.0%. When amending the soil with 3% and 5% of cement, the contraction coefficient of the soil was smaller than that amended by a moderate amount of silica fume. 【Conclusion】 Considering the requirement against frost heave, dry shrinkage and shear strength of the salinized foundation soil of channel, our experimental results suggested that amending the soil with cement and fly ash at high ratio can achieve the goal. Amending the soil with silica fume at moderate ratio or magnesium slag at low ratio is also able to solidify the soil to a satisfactory level. |
| Key words: curing agent; saline soil; mechanical property; calculation formula; channel |
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