| 引用本文: | 李宏波,田军仓,南红兵,等.几种固化剂对渠道盐渍土地基力学性能影响的试验研究[J].灌溉排水学报,2018,37(12):94-99. |
| LI Hongbo,TIAN Juncang,NAN Hongbing,et al.几种固化剂对渠道盐渍土地基力学性能影响的试验研究[J].灌溉排水学报,2018,37(12):94-99. |
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| 摘要: |
| 【目的】明晰水泥、粉煤灰、硅灰、镁渣作为渠道盐渍土地基固化剂的固化效果。【方法】设计了水泥、粉煤灰、硅灰、镁渣固化剂3种掺量的正交试验，通过不同龄期的三轴试验、压缩试验和干缩试验研究了其力学性能。【结果】①7 d龄期固化盐渍土黏聚力最大可以增大2.97倍，内摩擦角最大可以增大3.78倍；②28 d龄期固化盐渍土黏聚力最大可以增大4.81倍，内摩擦角最大可以增大5.84倍；③28 d龄期5次冻融循环后，素土试件破坏，无抗剪强度，固化盐渍土黏聚力最大损失了23.1%，最小损失了5.1%，内摩擦角最大损失了25.0%，最小基本无损失。④当水泥掺量为3%和5%，硅灰掺入剂量适中，固化盐渍土的干缩系数较小。【结论】综合考虑渠道盐渍土地基抗冻胀、抗干缩和抗剪强度的要求，建议采用高掺量水泥和粉煤灰，中掺量硅灰和低掺量镁渣固化渠道盐渍土地基较为适宜。 |
| 关键词: 固化剂； 盐渍土； 力学性能； 计算公式； 渠道 |
| 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 |
