纤维对纳米二氧化硅-石灰改良粉土力学性质的影响
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中国石油大学(华东)

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国家自然科学基金(51208510);山东省研究生教育质量提升计划项目(SDYY17020),山东省研究生教育创新计划项目资助(SDYY15140)


Study on the mechanical properties of nano-silica and lime stabilized silt reinforced by fiber
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China University of Petroleum (Huadong)

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National Natural Science Foundation of China (Grant No. 51208510); Shandong Province Graduate Education Quality Improvement Program (SDYY17020); Shandong Graduate Education Innovation Program (SDYY15140)

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    摘要:

    在山东,黄泛区粉土分布广泛,在铁路路基填料紧缺的情况下,常用改良粉土作为路基填料。选用纳米二氧化硅和石灰作为改良剂,对黄泛区粉土进行改良,并通过击实试验以及无侧限抗压强度试验对其强度进行测定,发现纳米二氧化硅-石灰改良粉土虽然强度有显著提升,同时也呈现出脆性较大的不良特性。为改善纳米二氧化硅-石灰改良粉土的脆性,在改良粉土中加入聚丙烯纤维并通过系列试验研究了纤维掺量和长度对纳米二氧化硅-石灰改良粉土强度和脆性的影响,确定纤维的最优掺量和最优长度。结果表明:纤维的加入能改善纳米二氧化硅-石灰改良粉土的脆性,提高其抗压及抗剪强度;当纤维掺量为0.4%、纤维长度为2cm时,改良效果最好。

    Abstract:

    In Shandong Province, silt is widely distributed in the Yellow River flooding area. In the case of shortage of railway roadbed filling, improved silt is commonly used as roadbed filling. Using nano-silica and lime as modifiers, the silt in the Yellow River floodplain area was improved. The strength of the silt was measured by compaction test and unconfined compressive strength test. It was found that although the strength of the silt improved by nano-silica-lime was significantly improved, it also showed the bad characteristics of brittleness. For the present nano-silica and lime improved silt, the strength of the improved silt has been significantly improved, but it also shows the bad characteristics of brittleness. In order to improve the brittleness of silt improved by nano-silica-lime, polypropylene fibers were added to the improved silt and the effects of fiber content and length on the strength and brittleness of the silt improved by nano-silica-lime were studied through a series of experiments, and the optimum fiber content and the optimum fiber content were determined. The results show that the brittleness and compressive and shear strength of the silt improved by nano-silica-lime can be improved by adding fibers;and when the content of fibers is 0.4% and the length of fibers is 2 cm, the improvement effect is the best.

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  • 收稿日期:2019-06-11
  • 最后修改日期:2019-08-20
  • 录用日期:2019-09-16
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