麦秆纤维加筋土的抗冲蚀性及其防护效果试验研究

发布时间：2018-06-03 23:39

本文选题：加筋土 + 麦秆纤维　；参考：《铁道科学与工程学报》2017年10期

【摘要】：为了研究天然纤维加筋土的抗冲蚀性能及其防护效果,选取麦秆纤维为加筋材料,并加入定量石灰,制备麦秆纤维加筋土试样,进行直剪试验、崩解性试验及模拟降雨冲刷试验。试验结果表明:麦秆纤维加筋提高了土体的抗剪强度,主要表现为黏聚力随龄期增长明显,最大黏聚力增长率约为400%,内摩擦角增长较小,最大内摩擦角增长率约为50%,石灰+麦秆纤维加筋土的强度增长率高于纯麦秆纤维加筋土,纤维加筋率的增加可以明显提高加筋土的抗剪强度;麦秆纤维加筋有效降低土体的崩解性,崩解速率降低系数平均约为4.83,石灰的加入可以进一步提高纤维加筋土的水稳定性;麦秆纤维加筋土的防护效果明显,含泥量和径流量均比较稳定,含泥量平均降低约40%,且随着降雨历时的增长,防护效果更明显。本研究结果对于麦秆纤维加筋土应用于黄土边坡坡面防护具有指导意义。
[Abstract]:In order to study the erosion resistance of natural fiber reinforced soil and its protective effect, wheat stalk fiber was selected as reinforced material, and quantitative lime was added to prepare wheat stalk fiber reinforced soil sample, and the direct shear test was carried out. Disintegration test and simulated rainfall scour test. The results show that the shear strength of the soil is improved by the reinforcement of wheat straw fiber, which mainly shows that the cohesive force increases obviously with the age, the maximum cohesion rate is about 400, and the angle of internal friction increases slightly. The growth rate of maximum internal friction angle is about 50. The strength growth rate of lime straw fiber reinforced soil is higher than that of pure wheat stalk fiber reinforced soil. Wheat stalk fiber reinforced soil can effectively reduce the disintegration of soil, the average coefficient of disintegration rate is about 4.83, the addition of lime can further improve the water stability of fiber reinforced soil, and the protective effect of wheat stalk fiber reinforced soil is obvious. The mud content and runoff are stable, the average mud content is reduced about 40%, and with the increase of rainfall duration, the protective effect is more obvious. The results of this study are of guiding significance for the application of wheat stalk fiber reinforced soil in slope protection of loess slope.
【作者单位】：长安大学公路学院;山西省交通科学研究院;
【基金】：国家自然科学基金面上项目(41272285) 中央高校基本科研业务专项资金资助项目(2013G2211003) 黄土地区公路建设与养护技术交通行业重点实验室开发课题资助项目(KLTCR-Y12-5)
【分类号】：TU41

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