被动柔性防护网在泥石流灾害治理中的应用研究

发布时间：2019-02-19 20:44

【摘要】：我国地域辽阔,山群众多,国土面积的三分之二为山地丘陵地区,尤其是中西部地区,地形起伏大,地质构造复杂,极易发生泥石流、滑坡、山体崩塌坠落等重大边坡地质灾害,严重威胁着人民的生命财产安全和交通运输安全由于被动柔性防护网在经济性、安全性、环保性等方面具有显著的优越性,因此在边坡灾害防治中的应用越来越广泛。关于落石冲击被动柔性防护网的研究也越来越多,近年来,被动柔性防护网逐渐被引入拦截泥石流,但是对于其拦截泥石流的研究较为少见。泥石流和落石冲击被动柔性防护网时的荷载形式存在较大差异,其动态响应也不相同。因此,本文对被动柔性防护网拦截泥石流的拦截效果、破坏类型及其基础设计等内容进行了研究。主要研究工作如下:(1)对设置于四川省道217线理塘县城至稻城亚丁公路的8道VX-100型柔性防护系统拦截泥石流情况进行现场调查研究,拟定调查方案,通过观察法和实验法对其进行定性和定量调查,理清基本情况,分析其拦截性能和主要破坏类型,为后续泥石流柔性防护结构的改进措施及基础设计提供依据。(2)尽管泥石流柔性防护系统具有良好的拦截性能,但局部构件也出现了不同类型和不同程度的破坏,分析泥石流柔性防护结构的破坏原因,并针对主要破坏类型提出改进方案及设计对策,为泥石流柔性防护系统的工程应用实现更好的拦截效果提供参考价值。(3)分析泥石流柔性防护结构的基础设计原则与方法,指出基础破坏形式及破坏机理,总结产生基础破坏的影响因素。基于实地调研和建筑结构基础设计原理,提出桩墩自身强度计算公式、桩墩与土体之间的摩擦滑移计算公式、土体剪切破坏计算公式、沟床基础冲刷深度计算公式,为泥石流柔性防护结构的基础设计提供理论依据。(4)研究泥石流柔性防护结构的施工程序及方法,提出施工注意事项:施工中须保证减压环的安装数量及位置正确;重视施工安全。
[Abstract]:China has a vast territory and a large number of mountain masses. 2/3 of the land area is mountainous and hilly area, especially in the central and western regions. The topography is large and the geological structure is complex, so it is easy to occur debris flows and landslides. Major slope geological disasters, such as mountain collapse and fall, seriously threaten the safety of people's lives, property and transportation because passive flexible protective nets have remarkable advantages in economy, safety, environmental protection, etc. Therefore, the application in slope disaster prevention is more and more extensive. There are more and more researches on the passive flexible protective net of rock fall impact. In recent years, passive flexible protection net has been gradually introduced into the interception of debris flow, but the research on the interception of debris flow is relatively rare. The load forms of debris flow and rock fall impact passive flexible protective net are different, and the dynamic response is also different. Therefore, the interception effect, damage type and basic design of debris flow interception by passive flexible protective net are studied in this paper. The main research work is as follows: (1) the scene investigation and study of 8 VX-100 flexible protection system intercepting debris flow situation in Litang County Road to Daocheng Aden Highway in Sichuan Province are carried out, and the investigation scheme is drawn up. Through the qualitative and quantitative investigation by observation and experiment, the basic situation is sorted out, and its interception performance and main damage types are analyzed. It provides the basis for the improvement measures and foundation design of debris flow flexible protection structure. (2) although the debris flow flexible protection system has good interception performance, there are different types and degrees of damage to local components. The failure reason of debris flow flexible protective structure is analyzed, and the improvement scheme and design countermeasures are put forward according to the main failure types. It provides reference value for the engineering application of debris flow flexible protection system to achieve better interception effect. (3) analyzing the basic design principles and methods of debris flow flexible protection structure, pointing out the foundation failure form and failure mechanism. Summarize the influencing factors of foundation damage. Based on the field investigation and the design principle of building structure foundation, the formulas for calculating the strength of pile pier, the friction and slip between pile pier and soil, the shear failure of soil, and the scour depth of ditch bed foundation are put forward. To provide the theoretical basis for the foundation design of the debris flow flexible protection structure. (4) study the construction procedure and method of the debris flow flexible protection structure, put forward the points for attention in the construction: ensure the correct installation quantity and position of the relief ring in the construction; Attach importance to construction safety.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U417.1

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