不同掺合料对流态固化土崩解特性影响的试验研究

李向阳; 高策

doi:10.20265/j.cnki.issn.1007-2993.2024-0456

不同掺合料对流态固化土崩解特性影响的试验研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0456

李向阳,
高策

陕西建工第五建设集团有限公司，陕西西安　710000

详细信息

作者简介:
李向阳，男，1976年生，大学本科，高级工程师，主要从事黄土工程力学特性方面的研究。E-mail：543040864@qq.com

中图分类号: TU411
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- 文章访问数: 6
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- 被引次数: 0
出版历程
- 收稿日期: 2024-10-08
- 修回日期: 2025-05-09
- 录用日期: 2025-06-26
- 刊出日期: 2026-04-09

Experimental study on the influence of different admixtures on the disintegration characteristics of fluid-consolidated soil

Scegc No.5 Construction Engineering Group Company Ltd., Xi’an 710000, Shaanxi, China

摘要

摘要: 黄土因其特殊的物理化学性质，在冻融循环的自然环境作用下，易发生崩解，进而影响工程建设的安全与耐久性。针对此问题，选取了水泥、生石灰、粉煤灰、聚丙烯纤维及仿钢纤维等5种不同的材料制备流态固化土，通过室内模拟冻融循环试验，分析在不同材料、不同冻融循环次数下的崩解特性，评估改良效果。研究结果表明：水泥、生石灰和水泥−仿钢纤维改良效果较好，崩解率、崩解速率均有不同幅度的下降；仅在未冻融情况下，粉煤灰和聚丙烯纤维对崩解速率有减缓作用；水泥−仿钢纤维复合材料改良效果优于单一材料（水泥）；冻融循环对土体崩解有促进作用。
- 黄土 /
- 流态固化土 /
- 崩解 /
- 冻融循环
Abstract: Due to its special physical and chemical properties, loess is prone to disintegration under natural conditions of freeze-thaw cycles, which in turn affects the safety and durability of engineering construction. To address this issue, five different materials—cement, quicklime, fly ash, polypropylene fiber, and steel fiber-reinforced polymer—were selected to prepare fluidized solidified soil. Through indoor simulated freeze-thaw cycle experiments, the disintegration characteristics under different materials and different numbers of freeze-thaw cycles were analyzed to evaluate the improvement effects, leading to the following conclusions: Cement, quicklime, and cement–steel fiber composites showed relatively good improvement effects, with varying degrees of reduction in disintegration rate and disintegration speed; fly ash and polypropylene fiber only slowed the disintegration rate in the absence of freeze-thaw cycles; the cement–steel fiber composite material had better improvement effects than a single material (cement). Freeze-thaw cycles have a promoting effect on soil disintegration.
- loess /
- fluid-consolidated soil /
- disintegration /
- freeze-thaw cycles

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图 1 冻融箱图

Figure 1. Freeze-thaw chamber

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图 2 崩解试验装置示意图

Figure 2. Schematic diagram of the disintegration test apparatus

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图 3 崩解装置图

Figure 3. Disintegration device

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图 4 未完全崩解组的最终崩解率

Figure 4. Final disintegration rate of the incompletely disintegrated group

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图 5 不同水泥掺入比试样的崩解曲线

Figure 5. Disintegration curves of specimens with different cement content

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图 6 不同生石灰掺入比试样的崩解曲线

Figure 6. Disintegration curves of samples with different quicklime admixture ratios

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图 7 完全崩解组的崩解速率

Figure 7. Disintegration rate of the fully disintegrated group

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图 8 不同粉煤灰掺入比试样的崩解曲线

Figure 8. Disintegration curves of specimens with different fly ash content

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图 9 不同聚丙烯纤维掺入比试样的崩解曲线

Figure 9. Disintegration curves of specimens with different polypropylene fiber content

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图 10 5%水泥−仿钢纤维改良黄土最终崩解率

Figure 10. Final disintegration rate of 5% cement-steel fiber improved loess

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图 11 10%水泥−仿钢纤维改良黄土最终崩解率

Figure 11. Final disintegration rate of 10% cement-steel fiber improved loess

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图 12 5%水泥+不同掺入比仿钢纤维试样的崩解曲线

Figure 12. Disintegration curves of specimens with 5% cement and different proportions of simulated steel fibers

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图 13 10%水泥+不同掺入比仿钢纤维试样的崩解曲线

Figure 13. Disintegration curves of specimens with 10% cement and different proportions of simulated steel fiber

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表 1 黄土基本物理性质

Table 1. Basic physical properties of loess

最大干密度 /（g·cm⁻³）	孔隙比	初始含水率/%	塑限 /%	液限 /%
1.72	1.06	15.2	16.1	28.3

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表 2 粉煤灰化学成分

Table 2. Chemical composition of fly ash

化学成分	SiO₂	Al₂O₃	CaO	Fe₂O₃	MgO	SO₃
含量/%	43	23	5.6	2.5	0.95	0.8

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表 3 改良材料配比

Table 3. Improved material proportion

改良材料	材料掺量
水泥	5%，10%，15%
生石灰	10%，15%，20%
粉煤灰	10%，15%，20%
聚丙烯纤维	0.2%，0.4%，0.8%
水泥+仿钢纤维	水泥5%+纤维0.2%
	水泥5%+纤维0.4%
	水泥5%+纤维0.8%
	水泥10%+纤维0.2%
	水泥10%+纤维0.4%
	水泥10%+纤维0.8%
	水泥15%+纤维0.2%
	水泥15%+纤维0.4%
	水泥15%+纤维0.8%

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