本文關(guān)鍵詞：泥石流沖擊作用下新型楔擋分流結(jié)構(gòu)動(dòng)力響應(yīng)分析　出處：《蘭州理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 泥石流 流固耦合 攔擋結(jié)構(gòu) CFX 數(shù)值模擬 動(dòng)力響應(yīng)

【摘要】：泥石流作為典型的地質(zhì)災(zāi)害,其危害巨大,對(duì)泥石流區(qū)域人民的生命財(cái)產(chǎn)及生態(tài)環(huán)境造成巨大威脅,對(duì)建筑物具有極強(qiáng)的破壞力,嚴(yán)重制約當(dāng)?shù)亟?jīng)濟(jì)發(fā)展。隨著全球氣候變暖,極端天氣導(dǎo)致強(qiáng)降雨的頻繁出現(xiàn),再加上重大工程開工建設(shè)等人類活動(dòng)的影響,滑坡、泥石流等突發(fā)性地質(zhì)災(zāi)害日益頻繁,呈現(xiàn)出頻發(fā)性、廣泛性、破壞性的空前態(tài)勢,并在不斷地刷新歷史紀(jì)錄。攔擋壩是泥石流治理中一種重要的防治結(jié)構(gòu),其具有安全、可靠、造價(jià)低廉的優(yōu)點(diǎn)。隨著當(dāng)前泥石流自然災(zāi)害的日益加劇,以前單一低效的防治結(jié)構(gòu)已不足以應(yīng)付大型泥石流的危害。對(duì)于攔擋結(jié)構(gòu)的選擇,更應(yīng)注意可靠性、高效性、經(jīng)濟(jì)性、可行性、施工方便等因素。本課題針對(duì)當(dāng)前泥石流攔擋結(jié)構(gòu)的諸多缺點(diǎn),提出了一種新型的攔擋結(jié)構(gòu)——楔擋分流結(jié)構(gòu),通過工程數(shù)值模擬軟件ANSYS Workbench對(duì)設(shè)計(jì)的新型楔擋分流結(jié)構(gòu)在泥石流沖擊作用下的動(dòng)力響應(yīng)進(jìn)行了數(shù)值模擬,主要內(nèi)容如下： (1)論述了有關(guān)泥石流防治技術(shù)的認(rèn)識(shí)與研究及目前流固耦合國內(nèi)外研究現(xiàn)狀；介紹了流固耦合的基本理論及泥石流與結(jié)構(gòu)流固耦合求解方法。 (2)結(jié)合實(shí)地調(diào)研,設(shè)計(jì)出新型攔擋結(jié)構(gòu)體系——楔擋分流結(jié)構(gòu)。研究解決具體設(shè)計(jì)問題,如尺寸、材料、細(xì)部構(gòu)造,泥石流沖擊力的計(jì)算方法等；運(yùn)用工程數(shù)值模擬軟件ANSYS Workbench對(duì)設(shè)計(jì)的新型楔擋分流結(jié)構(gòu)在泥石流沖擊作用下的動(dòng)力響應(yīng)進(jìn)行數(shù)值模擬,并在流體分析軟件CFX中對(duì)黏性泥石流流場進(jìn)行了模擬,得到泥石流速度場及壓力場的大小及分布；通過耦合面荷載的傳遞,把泥石流域的壓力場作為荷載作用于結(jié)構(gòu)域上,最終得到結(jié)構(gòu)的位移與應(yīng)力。 (3)改變結(jié)構(gòu)參數(shù),做幾組不同結(jié)構(gòu)進(jìn)行對(duì)比研究,以比較出各類結(jié)構(gòu)的優(yōu)缺點(diǎn)和應(yīng)用面,突出新型攔擋結(jié)構(gòu)體系的優(yōu)越性。通過對(duì)比分析不同楔擋角度的新型楔擋分流結(jié)構(gòu),得到一些有益的結(jié)論。研究表明：楔擋分流結(jié)構(gòu)的楔擋角度越大,結(jié)構(gòu)所受應(yīng)力就越大,容易破壞。綜合流速和角度的關(guān)系,得到60°的楔擋分流結(jié)構(gòu)綜合攔擋分流效果最佳。 (4)提出新型楔擋分流結(jié)構(gòu)與交錯(cuò)槽結(jié)合的新型結(jié)構(gòu)體系,并對(duì)該新型體系進(jìn)行研究初探；通過對(duì)其流固耦合動(dòng)力性能研究表明該體制值得嘗試,為今后的泥石流攔擋工程的實(shí)際提供了參考。
[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.

【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU311.3

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本文編號(hào)：1371993