泥石流冲击作用下新型楔挡分流结构动力响应分析

发布时间：2018-01-03 02:30

本文关键词：泥石流冲击作用下新型楔挡分流结构动力响应分析　出处：《兰州理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：泥石流作为典型的地质灾害,其危害巨大,对泥石流区域人民的生命财产及生态环境造成巨大威胁,对建筑物具有极强的破坏力,严重制约当地经济发展。随着全球气候变暖,极端天气导致强降雨的频繁出现,再加上重大工程开工建设等人类活动的影响,滑坡、泥石流等突发性地质灾害日益频繁,呈现出频发性、广泛性、破坏性的空前态势,并在不断地刷新历史纪录。拦挡坝是泥石流治理中一种重要的防治结构,其具有安全、可靠、造价低廉的优点。随着当前泥石流自然灾害的日益加剧,以前单一低效的防治结构已不足以应付大型泥石流的危害。对于拦挡结构的选择,更应注意可靠性、高效性、经济性、可行性、施工方便等因素。本课题针对当前泥石流拦挡结构的诸多缺点,提出了一种新型的拦挡结构——楔挡分流结构,通过工程数值模拟软件ANSYS Workbench对设计的新型楔挡分流结构在泥石流冲击作用下的动力响应进行了数值模拟,主要内容如下： (1)论述了有关泥石流防治技术的认识与研究及目前流固耦合国内外研究现状；介绍了流固耦合的基本理论及泥石流与结构流固耦合求解方法。 (2)结合实地调研,设计出新型拦挡结构体系——楔挡分流结构。研究解决具体设计问题,如尺寸、材料、细部构造,泥石流冲击力的计算方法等；运用工程数值模拟软件ANSYS Workbench对设计的新型楔挡分流结构在泥石流冲击作用下的动力响应进行数值模拟,并在流体分析软件CFX中对黏性泥石流流场进行了模拟,得到泥石流速度场及压力场的大小及分布；通过耦合面荷载的传递,把泥石流域的压力场作为荷载作用于结构域上,最终得到结构的位移与应力。 (3)改变结构参数,做几组不同结构进行对比研究,以比较出各类结构的优缺点和应用面,突出新型拦挡结构体系的优越性。通过对比分析不同楔挡角度的新型楔挡分流结构,得到一些有益的结论。研究表明：楔挡分流结构的楔挡角度越大,结构所受应力就越大,容易破坏。综合流速和角度的关系,得到60°的楔挡分流结构综合拦挡分流效果最佳。 (4)提出新型楔挡分流结构与交错槽结合的新型结构体系,并对该新型体系进行研究初探；通过对其流固耦合动力性能研究表明该体制值得尝试,为今后的泥石流拦挡工程的实际提供了参考。
[Abstract]:Debris flow is a typical geologic disaster, the harm is huge, poses a great threat to life and property and ecological environment of regional debris flow of people, has a strong destructive power of the building, seriously restricts the development of local economy. With the global climate warming, extreme weather caused heavy rain occurs frequently, influence, coupled with the major project construction human activities such as landslides, mudslides and other unexpected geological disasters have become increasingly frequent, showing frequent, extensive, destruction of unprecedented situation, and constantly refresh the historical record. The dam is an important structure in the prevention and control of debris flow control, which is safe, reliable, low cost advantages. With the development of debris flow natural disasters increasing, harm prevention before single structure inefficient is not enough to cope with large debris flow. For blocking structure, more should pay attention to reliability, efficiency, Economic factors, feasibility, convenient construction etc. Aiming at the disadvantages of the debris flow blocking structure, puts forward a new structure - wedge block block dividing structure, power engineering numerical simulation model by ANSYS Workbench software to design the wedge block dividing structure in debris flow under impact response of the numerical simulation, the main the contents are as follows:
(1) the understanding and research of debris flow control technology and the current research status of fluid solid coupling at home and abroad are discussed. The basic theory of fluid solid coupling and the solution method of fluid structure interaction between debris flow and structure are introduced.
(2) combined with field research, design a new type of retaining structure system, wedge block dividing structure. Research on solving specific problems such as design, size, material, structure, impact force of debris flow calculation method; dynamic application engineering numerical simulation software ANSYS Workbench to design the new type wedge block in shunt structure under impact of debris flow the response was simulated, and the fluid analysis software CFX to simulate the flow field of viscous debris flow, the debris flow velocity field and pressure field distribution and size; pass through the coupling surface load, the debris flow pressure field as the load on the domain, finally get the displacement and stress of structure.
(3) the change of structural parameters, several groups of different structure were studied, to compare the advantages and disadvantages and the application of the surface structure of all kinds, outstanding superiority model block structure system. Through the comparative analysis of different wedge angle wedge model block retaining shunt structure, get some beneficial conclusions. Research shows that the wedge block shunt the structure of the wedge block angle is large, the structure stress is big, easy to destroy. The relationship between flow rate and comprehensive angle, 60 degree wedge block and shunt shunt structure comprehensive effect is the best.
(4) put forward a new wedge block shunt structure and staggered structure system of slot combination, and the new system; through the study of fluid solid coupling dynamic performance of the system shows that this is worth trying, provide a practical reference for future against debris flow engineering.

【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU311.3

【参考文献】