浸水作用下二灰黄土的稳定性

张志权; 井彦林; 孔德泉; 赵洁

doi:10.19818/j.cnki.1671-1637.2018.01.006

浸水作用下二灰黄土的稳定性

doi: 10.19818/j.cnki.1671-1637.2018.01.006

张志权^1,,
井彦林¹,
孔德泉^{1, 2},
赵洁³

1.
长安大学建筑工程学院, 陕西西安 710061
2.
宾夕法尼亚州立大学工程学院, 宾夕法尼亚施泰特科利奇 16802
3.
陕西省高速公路建设集团公司, 陕西西安 710065

基金项目:

国家自然科学基金项目 41472267

详细信息

作者简介:
张志权(1973-), 男, 陕西岐山人, 长安大学高级工程师, 从事岩土工程研究

中图分类号: U412.222
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出版历程
- 收稿日期: 2017-10-12
- 刊出日期: 2018-02-25

Stability of lime-fly ash loess under action of water immersion

1.
School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China
2.
College of Engineering, The Pennsylvania State University, State College 16802, Pennsylvania, USA
3.
Shaanxi Expressway Construction Group Co., Ltd., Xi'an 710065, Shaanxi, China

More Information

Author Bio:
ZHANG Zhiquan(1973-), male, seniorengineer, zzqca@163.com

摘要

摘要: 对二灰黄土进行了不同干湿循环次数和不同浸水时间2种浸水作用下的强度试验和压汞试验, 分析了二灰黄土水稳定性。分析结果表明: 二灰黄土强度较高, 7 d龄期无侧限抗压强度可以达到1.33 MPa; 随着干湿循环次数的增加, 二灰黄土强度出现衰减, 经过2次干湿循环后二灰黄土强度就大幅度降低, 并趋于稳定, 经过10次干湿循环后二灰黄土无侧限抗压强度和抗剪强度降低幅度分别为42.8%、47.4%; 随着干湿循环次数的增加, 二灰黄土的总孔隙体积呈线性增加, 经过10次干湿循环后二灰黄土的总孔隙体积从0.200 1 mL·g^-1增大到0.238 3 mL·g^-1, 增加了19%; 在干湿循环过程中, 不同孔径孔隙体积变化规律不同, 大孔隙体积呈线性增加, 小孔隙体积和微孔隙体积基本上没有发生变化; 随着浸水时间的延长, 二灰黄土强度出现衰减, 经过2 d浸水后强度产生大幅度降低, 并随着浸水时间继续延长强度逐渐趋于稳定, 经过4 d浸水后二灰黄土无侧限抗压强度和抗剪强度降低幅度分别为33.6%、54.7%。可见: 在石灰与粉煤灰掺量较小的情况下, 水对二灰黄土的强度有明显的弱化作用, 浸水作用可导致二灰黄土强度降低, 干密度略微减小, 总孔隙体积增大, 但相对于未改性黄土, 二灰黄土仍然具有较高的强度和较好的水稳定性, 可以在黄土地区作为道路的底基层推广使用。
- 路基工程 /
- 二灰黄土 /
- 水稳定性 /
- 强度试验 /
- 压汞试验
Abstract: The strength tests and mercury injection tests on lime-fly ash loess under 2 actions of water immersion with different times of wetting-drying cycle and different saturation times were conducted, and the stability of lime-fly ash loess was analyzed.Analysis result shows that the unconfined compressive strength of lime-fly ash loess at 7 dis higher and about 1.33 MPa.With the increase of the times of wetting-drying cycle, the strength of lime-fly ash loess decays.After2 times of wetting-drying cycle, the strength falls drastically and tends to be stable.After10 times of wetting-drying cycle, the unconfined compressive strength and shear strength of limefly ash loess decrease by 42.8% and 47.4%, respectively.With the increase of the times of drying-wetting cycle, the total void volume of lime-fly ash loess increases linearly.After 10 times of wetting-drying cycle, the total pore volume of lime-fly ash loess increases from 0.200 1 mL·g^-1 to 0.238 3 mL·g^-1, which is equivalent to 19%.During drying-wetting cycle, the pore diameter variation rules are different, the large void volume increases linearly, but the small and micro void volumes do not change basically.With the increase of saturation time, the strength of limefly ash loess decays, decreases significantly after 2 dwater immersion, and gradually stabilizes with the continuous immersion.After 4 dwater immersion, the unconfined compressive strength and shear strength of lime-fly ash loess decrease by 33.6% and 54.7%, respectively.The result indicates that when the contents of lime and fly ash are less, the water can weaken the strength of lime-fly ash loess obviously, the action of water immersion can lead to the decrease of strength, the dry density slightly decreases, and the total pore volume increases.But compared with the unmodified loess, the lime-fly ash loess has higher strength and better water stability, and can be used as road subgrade in loess area.
- subgrade engineering /
- lime-fly ash loess /
- water stability /
- strength test /
- mercury injection test

HTML全文

图 1 电动击实仪

Figure 1. Electric compaction instrument

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图 2 无侧限强度测定仪

Figure 2. Unconfined compressive strength instrument

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图 3 直剪仪

Figure 3. Direct shearing instrument

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图 4 压汞仪

Figure 4. Mercury injection porosimeter

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图 5 无侧限强度试验试样

Figure 5. Samples for unconfined strength experiment

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图 6 直剪强度试验试样

Figure 6. Samples for direct shear strength experiment

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图 7 压汞试验试样

Figure 7. Samples for mercury injection experiment

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图 8 干湿循环作用下无侧限抗压强度

Figure 8. Unconfined compressive strengths under wetting-drying cycles

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图 9 干湿循环作用下抗剪强度

Figure 9. Shearing strengths under wetting-drying cycles

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图 10 干湿循环作用下内聚力

Figure 10. Cohesive forces under wetting-drying cycles

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图 11 干湿循环作用下内摩擦角

Figure 11. Internal friction angles under wetting-drying cycles

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图 12 干湿循环作用下干密度

Figure 12. Dry densities under wetting-drying cycles

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图 13 干湿循环作用下总孔隙体积

Figure 13. Total void volumes under wetting-drying cycles

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图 14 干湿循环作用下大孔隙体积

Figure 14. Large void volumes under wetting-drying cycles

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图 15 干湿循环作用下中孔隙体积

Figure 15. Medium void volumes under wetting-drying cycles

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图 16 干湿循环作用下小孔隙体积

Figure 16. Small void volumes under wetting-drying cycles

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图 17 干湿循环作用下微孔隙体积

Figure 17. Micro void volumes under wetting-drying cycles

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图 18 不同浸水时间的无侧限抗压强度

Figure 18. Unconfined compressive strengths with different immersion times

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图 19 不同浸水时间的抗剪强度

Figure 19. Shearing strengths with different immersion times

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图 20 不同浸水时间的内聚力

Figure 20. Cohesive forces with different immersion times

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图 21 不同浸水时间的内摩擦角

Figure 21. Internal friction angles with different immersion times

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表 1 土的物理性质

Table 1. Physical properties of soil

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表 2 石灰的性质与化学成分

Table 2. Properties and chemical constitutions of white lime

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表 3 粉煤灰的物理性质与化学成分

Table 3. Physical properties and chemical constitutions of fly ash

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表 4 试件

Table 4. Specimens

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表 5 干湿循环作用下强度试验结果

Table 5. Test results of strength under wetting-drying cycles

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表 6 干湿循环作用下干密度与孔隙分布试验结果

Table 6. Test results of dry density and void distribution under wetting-drying cycles

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表 7 不同浸水时间强度试验结果

Table 7. Test results of strength under different saturation times

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