本文關(guān)鍵詞：加強(qiáng)型泥石流柔性防護(hù)體系抗沖擊性能研究　出處：《蘭州理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 柔性防護(hù)體系 泥石流 抗沖擊性能 數(shù)值模擬 ANSYS/LS-DYNA

【摘要】：近年來(lái),甘肅省泥石流災(zāi)害的頻繁發(fā)生,給當(dāng)?shù)厝嗣竦纳?cái)產(chǎn)安全造成了嚴(yán)重的危害。舟曲8.8特大泥石流災(zāi)害表明,泥石流中的大塊石是造成防治結(jié)構(gòu)損毀的最主要原因。因此,研究在泥石流大塊石沖擊作用下防治結(jié)構(gòu)抗沖擊性能有著重大的意義。在眾多防治結(jié)構(gòu)中,泥石流柔性防護(hù)體系具有造價(jià)低、施工簡(jiǎn)便、易于維護(hù)、場(chǎng)地適應(yīng)性強(qiáng)和對(duì)環(huán)境景觀不構(gòu)成破壞等優(yōu)點(diǎn)。在國(guó)外的防治工程上得到了廣泛的推廣應(yīng)用,然而,學(xué)術(shù)界對(duì)其研究還不夠深入,尤其是對(duì)抵抗泥石流大塊石沖擊性能的研究基本處于空白階段。從結(jié)構(gòu)和力學(xué)的角度,采用顯示動(dòng)力非線性軟件ANSYS/LS-DYNA進(jìn)行數(shù)值模擬,對(duì)泥石流柔性防護(hù)體系受沖擊作用時(shí)的動(dòng)力響應(yīng)特征和失效破壞模式展開研究。主要研究?jī)?nèi)容包括以下幾方面:(1)研究分析沖擊作用在不同部位時(shí),泥石流柔性防護(hù)體系的動(dòng)力響應(yīng)特征。對(duì)防護(hù)體系的能量轉(zhuǎn)換、變形和構(gòu)件的軸力變化規(guī)律進(jìn)行對(duì)比分析,并評(píng)估防護(hù)體系的抗沖擊性能。改變沖擊速度,分析其對(duì)泥石流柔性防護(hù)體系抗沖擊性能的影響,并得出防護(hù)體系的失效破壞模式。結(jié)果表明:防護(hù)體系中支撐索是耗能能力較強(qiáng)的構(gòu)件。其中沖擊部位、支撐索約束端部和連接點(diǎn)處動(dòng)力響應(yīng)較大,建議在工程設(shè)計(jì)中予以加強(qiáng)。(2)提出受力狀態(tài)更為合理的結(jié)構(gòu)形式即帶豎向吊索的加強(qiáng)型泥石流柔性防護(hù)體系。通過(guò)數(shù)值模擬,將加強(qiáng)型防護(hù)體系與普通型防護(hù)體系的動(dòng)力響應(yīng)進(jìn)行對(duì)比分析,評(píng)價(jià)加強(qiáng)型防護(hù)體系的抗沖擊性能。改變沖擊速度,分析其對(duì)加強(qiáng)型防護(hù)體系的抗沖擊性能影響,并得出加強(qiáng)型防護(hù)體系的失效破壞模式。結(jié)果表明:增加豎向吊索后,間接地保護(hù)了環(huán)形網(wǎng)不被破壞,且防護(hù)體系的抗沖擊能力明顯增強(qiáng)了。(3)多塊石隨機(jī)分布且同時(shí)沖擊作用在加強(qiáng)型泥石流柔性防護(hù)體系時(shí),對(duì)防護(hù)體系的能量、變形和構(gòu)件軸力的動(dòng)力響應(yīng)特征進(jìn)行分析,并評(píng)估其抗沖擊性能。本文的研究成果為泥石流柔性防護(hù)體系的工程設(shè)計(jì)提供了一定的技術(shù)參考,為日后的工程應(yīng)用奠定一定的基礎(chǔ)。
[Abstract]:In recent years, the frequent occurrence of debris flow disasters in Gansu Province has caused serious harm to the safety of local people's lives and property. The rock mass in debris flow is the main reason to prevent the structure damage. Therefore, it is of great significance to study the anti-impact performance of the structure under the impact of debris flow rock mass. The flexible debris flow protection system has the advantages of low cost, simple construction, easy maintenance, strong site adaptability and no damage to the environmental landscape. It has been widely used in prevention and control projects abroad, however. Academic research on it is not deep enough, especially the research on the impact performance of debris flow blocks is basically blank. From the point of view of structure and mechanics. The dynamic nonlinear software ANSYS/LS-DYNA is used for numerical simulation. The dynamic response characteristics and failure failure mode of debris flow flexible protection system under impact are studied. The main research contents include the following aspects: 1) study and analysis of impact in different parts. The dynamic response characteristics of debris flow flexible protection system. The energy conversion, deformation and axial force change of the protection system are compared and analyzed, and the impact resistance performance of the protection system is evaluated and the impact velocity is changed. The impact on the impact resistance of the flexible debris flow protection system is analyzed, and the failure failure mode of the protection system is obtained. The results show that the bracing cable is the component with strong energy dissipation capacity in the protective system. The dynamic response of the restrained end part and the connection point of the bracing cable is large. It is suggested that the reinforced debris flow flexible protection system with vertical slings should be put forward as a more reasonable structural form in engineering design. Numerical simulation is carried out. The dynamic response of the reinforced protection system and the common protection system are compared and analyzed to evaluate the impact resistance of the enhanced protection system and change the impact speed. The impact on the impact resistance of the reinforced protective system is analyzed, and the failure failure mode of the reinforced protective system is obtained. The results show that the ring network is protected indirectly by increasing the vertical slings. And the anti-impact ability of the protective system obviously enhanced the impact energy of the protection system when the multi-block stone was randomly distributed and simultaneously impacted on the enhanced debris flow flexible protection system. The dynamic response characteristics of deformation and axial force are analyzed and its impact resistance is evaluated. The research results in this paper provide a certain technical reference for the engineering design of debris flow flexible protection system. To lay a foundation for future engineering application.
【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】：2016
【分類號(hào)】：P642.23

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