麦秸秆加筋黄土的抗侵蚀性试验

发布时间：2018-06-17 00:41

本文选题：道路工程 + 黄土边坡　；参考：《长安大学学报(自然科学版)》2017年01期

【摘要】：通过麦秸秆和石灰加筋黄土对黄土公路边坡进行坡面防护,试图解决黄土公路边坡因强降雨引起的坡面冲蚀破坏问题。为了研究麦秸秆加筋黄土的抗侵蚀性能及其防护效果,制备了原状黄土、麦秸秆加筋黄土、加石灰的麦秸秆加筋黄土试样,进行直剪试验、崩解性试验和抗冲刷性试验,分析抗剪强度特性、崩解性以及抗冲性的变化规律,评价麦秸秆加筋黄土的抗冲蚀性能,最后通过模拟降雨冲刷对比试验,验证麦秸秆加筋黄土的防护效果。研究结果表明:直剪试验中麦秸秆加筋增强了土体的抗剪强度,主要表现为粘聚力随着龄期的增长呈明显增长趋势,最大粘聚力增长率达到了311.6%,内摩擦角的增长趋势较不明显,最大内摩擦角增长率约为50%,加石灰的麦秸秆加筋黄土的粘聚力、内摩擦角比不加石灰的分别提高了44.5%和19.8%,石灰的加入改善了麦秸秆的加筋效果;崩解性试验和抗冲试验中,麦秸秆加筋降低了土体的崩解速率,提高了土体的抗冲刷系数,最小崩解速率降低了79.9%,最大抗冲刷系数增长了156.9%,土体的抗蚀性、抗冲性得到明显提高,石灰的加入进一步增强了麦秸秆加筋黄土的抗蚀、抗冲性;降雨冲刷试验明显地显示了麦秸秆加筋黄土防护效果,最大累计冲蚀量降低率达到41.9%,加石灰的麦秸秆加筋黄土的防护效果比不加石灰的防护效果更好。采用麦秸秆加筋黄土是黄土边坡值得推广的一种防护措施。
[Abstract]:The slope of loess highway slope is protected by wheat straw and lime reinforced loess in order to solve the problem of erosion and destruction of loess highway slope caused by heavy rainfall. In order to study the corrosion resistance of wheat straw reinforced loess and its protective effect, the loess specimens with intact loess, wheat straw reinforced loess and lime reinforced wheat straw were prepared, and the direct shear test, disintegration test and scour resistance test were carried out. The characteristics of shear strength, disintegration and impact resistance were analyzed, and the erosion resistance of wheat straw reinforced loess was evaluated. Finally, the protective effect of wheat straw reinforced loess was verified by simulated rainfall scour contrast test. The results show that the shear strength of soil is strengthened by wheat straw reinforcement in direct shear test, which mainly shows that the cohesive force increases obviously with the increase of age, the maximum cohesive force increases to 311.6 percent, and the increasing trend of internal friction angle is not obvious. The maximum increase rate of internal friction angle is about 50%. The cohesion of wheat straw reinforced loess with lime is increased by 44.5% and 19.80.The addition of lime improves the reinforcement effect of wheat straw, and in the disintegration test and the impact test, the internal friction angle increases by 44.5% and 19.8. Wheat straw reinforcement decreased the disintegration rate of soil, increased the erosion resistance coefficient of soil, decreased the minimum disintegration rate by 79.9%, increased the maximum erosion coefficient by 156.9%, and improved the soil erosion resistance and scour resistance obviously. The addition of lime further enhanced the corrosion and scour resistance of wheat straw reinforced loess, and the rainfall scour test obviously showed the protective effect of wheat straw reinforced loess. The maximum cumulative erosion reduction rate reached 41.9%. The protective effect of wheat straw reinforced loess with lime was better than that without lime. Using wheat straw reinforced loess is a protective measure worth popularizing 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) 黄土地区公路建设与养护技术交通行业重点实验室开放课题基金项目(KLTCR-Y12-5)
【分类号】：U416.16

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