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泥石流软基消能排导槽肋槛布置及冲刷特性实验研究
Alternative TitleExperimental study on decorate and scouring characteristics of debris flow drainage channel
Language中文
刘曙亮
Thesis Advisor游勇
2015
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Name硕士
Degree Discipline建筑与土木工程
Keyword软基消能排导槽 泥石流 实验 理论分析 优化设计
Abstract软基消能排导槽是泥石流治理中常用的工程措施之一,其主要作用是将泥石流排泄至指定位置,从而起到保护沿程建筑物的作用。排导槽设计质量的优劣直接影响其防治功能,目前软基消能排导槽设计仍多以设计者的经验来确定相关参数(肋槛埋深、肋槛间距等),大多缺乏足够的依据。如何在排导槽设计时选择合理的肋槛间距、肋槛埋深等相关参数,是目前急需解决的技术问题。 本文通过理论分析和室内排导槽模拟实验相结合的方法,主要研究了软基泥石流排导槽肋槛布置的相关规律以及在排导槽内的冲刷特性,得到了以下主要结论: 1)通过理论分析求出泥石流排导槽肋槛后最大冲刷深度的计算公式: 开展了大量室内排导槽实验,并利用实验数据对以上公式进行验证,计算值与实验值吻合良好,表明该公式合理可行; 2)根据实验结果可将两个肋槛之间的排导槽沟床情况划分为槛后冲刷区,冲於平衡区和槛前回於区三个部分。侵蚀坑横剖面具有凹形横剖面、震荡形横剖面、平缓型横剖面三种形态。实验发现泥石流排导槽槛后侵蚀坑的深度随泥石流重度的增大而减少,随坡度的增加而增加,随肋槛间距的增大而增大; 3)由于肋槛和排导槽对泥石流的阻挡作用,一定速度的泥石流体在排导槽中运动速度呈现逐渐降低的趋势。泥石流在排导槽内平均流动速度随泥石流重度的增加而减少,随泥石流排导槽坡度的增大而增大,随肋槛间距的增加而增加。泥石流在排导槽内消能率呈现如下规律:单个肋槛平均消能率随泥石流重度的增大而增大,随排导槽坡度的增大而增大。不同肋槛间距下,泥石流在排导槽内整体消能率随肋槛间距的增大而降低,单个肋槛平均消能率随肋槛间距的增大而增大。 4)通过对实验结果的数据拟合和价值工程分析,提出了一种肋槛间距的计算公式
Other Abstract Energy dissipation of soft ground platoon guide is one of commonly used engineering measures of debris flow management, its main function is to debris flow discharge to the specified location, so to protect the buildings along the function. Design guide, quality fit and unfit quality directly affects the function of prevention, the soft ground away to platoon guide groove design is still more to the experience of the designer to determine relevant parameters (rib sill buried depth, rib sill spacing, etc.), mostly the lack of adequate basis. How to guide design and choosing reasonable rib sill rib spacing, sill related parameters such as depth, is the urgent need to solve the technical problems. In this paper, through theoretical analysis and indoor platoon guide simulation experiment, the method of the combination of research is mainly focused on the soft ground landslide platoon guide rib sill arrangement of related laws and scouring characteristics within the platoon guide, the following main conclusions: 1) By theoretical analysis and mudslides platoon guide rib sill after calculation formula of maximum scour depth: Carried out a large number of indoor platoon guide groove experiment, and by using the experimental data validated the above formula, the calculation values in good agreement with the experimental results, show that the formula is reasonable and practical; 2) According to the experimental results the platoon guide groove between two ribs sill bed is divided into sill after scouring area, rushed back to before the balance and sill in the area of three parts. Erosion pit section has a concave section, shock section, flat type section three forms. Experiments found debris flow platoon guide sill after corrosion pit depth along with the augment of debris flow severely reduced, increases with the increase of the slope, sill with rib spacing increases; 3) Due to the rib sill and platoon guide block effect of debris flow, a certain velocity of debris flow body movement speed in the platoon guide shows the tendency of gradually reduce. Debris flow within the platoon guide average flow velocity with the increase of the debris flow severely reduced, along with the debris flow guide slope increases, with the increase of the rib sill spacing increases. Debris flow within the platoon guide single-lever and present the following rules: a single rib average energy dissipation sill with the increases of debris flow severely, along with the platoon guide slope increases. Under different rib sill spacing, debris flow within the platoon guide overall energy dissipation reduced along with the augment of rib sill spacing, single rib sill average energy dissipation sill with rib spacing increases. 4)Based on the results of data fitting and value engineering analysis, this paper proposes a calculation formula of the rib sill spacing: Keywords: soft foundation energy dissipation platoon guide groove; Debris flow; The experiment; The theoretical analysis;
Document Type学位论文
Identifierhttp://ir.imde.ac.cn/handle/131551/14175
Collection山地灾害与地表过程重点实验室
Affiliation中国科学院成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
刘曙亮. 泥石流软基消能排导槽肋槛布置及冲刷特性实验研究[D]. 北京. 中国科学院大学,2015.
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