黄土公路边坡冲刷机理及草泥防护适应性试验研究

发布时间：2018-05-27 05:18

本文选题：黄土边坡 + 冲刷机理　；参考：《长安大学》2014年硕士论文

【摘要】：随着我国西部大开发战略的逐步实施及山区高速公路的延伸，公路建设中黄土边坡问题凸显。边坡是高速公路建设和运营过程中最脆弱的部分，，其防护绿化是公路生态建设和安全运营的重点。研究黄土地区公路边坡土壤侵蚀机理及其生态防护技术，对于改善高速公路的生态环境，保证高速公路建设及运营过程中的生命财产安全有着重要的意义。本文依托开放课题干湿、冻融循环对黄土边坡冲刷的影响及草泥喷护适应性研究，通过收集国内外资料及野外调查，从边坡冲刷成因和黄土公路边坡冲刷的影响因素两方面对黄土公路边坡冲刷机理作了较系统的研究。通过大量的室内试验和模拟降雨冲刷试验，对草泥防护的防护机理、合理的配合比及其适应性进行了研究。试验研究表明，草泥材料的粘聚力、内摩擦角随着麦秆含量、龄期及石灰掺量的增加而增长，粘聚力的增长趋势比内摩擦角的明显；渗透系数随着麦秆含量、石灰掺量的增加而减少；草泥材料的崩解速率随着麦秆含量及龄期的增长而减小，合理的石灰掺量可以降低崩解速率；草泥材料的抗冲刷系数比原状黄土的抗冲刷系数大，其抗冲刷系数随着麦秆含量和龄期的增长而增大，随着石灰掺量的增加也有小幅的增大；草泥防护相对裸露黄土边坡的冲刷破坏程度小，抗冲刷效果好；草泥防护对连续性强降雨、不同坡比有较好的适应性和耐久性；麦秆含量为800g/m2、石灰掺量为5%的草泥防护效果最佳。
[Abstract]:With the gradual implementation of the strategy of western development and the extension of highway in mountainous area, the loess slope problem is prominent in highway construction. Slope is the most vulnerable part in the process of highway construction and operation, and its protection and greening is the focus of highway ecological construction and safe operation. The study of soil erosion mechanism and ecological protection technology of highway slope in loess area is of great significance to improve the ecological environment of expressway and ensure the safety of life and property in the process of highway construction and operation. Based on the research on the effect of dry-wet, freeze-thaw cycle on loess slope erosion and the adaptability of grass mud spraying, this paper collects domestic and foreign data and field investigation. The erosion mechanism of loess highway slope is studied systematically from two aspects: the cause of slope erosion and the influencing factors of loess highway slope erosion. Through a large number of indoor experiments and simulated rainfall scour tests, the protective mechanism, reasonable mix ratio and adaptability of grass mud protection were studied. The experimental results show that the cohesion and internal friction angle increase with the increase of straw content, age and lime content, the increasing trend of cohesion is more obvious than that of internal friction angle, and the permeability coefficient increases with the content of wheat straw. With the increase of lime content, the disintegration rate of straw mud decreased with the increase of straw content and age, and the reasonable lime content decreased the disintegration rate, and the scour resistance coefficient of grass mud material was higher than that of undisturbed loess. The scour resistance coefficient increases with the increase of straw content and age, and increases slightly with the increase of lime content. Straw mud protection has better adaptability and durability to continuous heavy rainfall and different slope ratio, and the straw content is 800g / m ~ 2 and lime content is 5%.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.14;U417.1

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