【摘要】：成蘭鐵路是目前國(guó)內(nèi)鐵路建設(shè)史上線路穿越地質(zhì)條件最為復(fù)雜的鐵路,其穿越龍門山區(qū)和岷江上游的高山深谷區(qū),沿線地形海拔高差達(dá)4000m,越嶺段隧道比例占90%以上。其間遭遇落石災(zāi)害的挑戰(zhàn)非常嚴(yán)峻。本文以此為背景,首先對(duì)典型的6座隧道洞口進(jìn)行了調(diào)研,獲取了這些洞口仰坡和落石的數(shù)據(jù),計(jì)算得到了落石的沖擊速度和影響范圍。然后,在現(xiàn)場(chǎng)調(diào)研的基礎(chǔ)上,利用動(dòng)力有限元軟件LS-DYNA對(duì)框架棚洞遭受落石沖擊作用進(jìn)行了模擬,主要包括：1框架棚洞在不同沖擊能量下的動(dòng)力響應(yīng)；2輕質(zhì)土相對(duì)于普通土的抗沖擊性能研究；3框架棚洞的最優(yōu)輕質(zhì)土墊層厚度研究；在做了以上的工作之后,本文從結(jié)構(gòu)形式出發(fā)提出了拱形棚洞的概念,并根據(jù)現(xiàn)場(chǎng)情況設(shè)計(jì)了拱形棚洞。同樣,首先利用有限元軟件LS-DYNA計(jì)算其在落石沖擊下的力學(xué)量,并與框架棚洞進(jìn)行對(duì)比研究。在對(duì)比研究的基礎(chǔ)上,得到了拱形棚洞具有更加抗沖擊的特性之后,設(shè)計(jì)了棚洞遭受落石沖擊的室內(nèi)模型試驗(yàn),考慮了不同的工況,重點(diǎn)對(duì)拱圈各部分應(yīng)變、沖擊力、位移進(jìn)行了監(jiān)測(cè),分析得到了各物理量的規(guī)律。最后對(duì)模型進(jìn)行了破壞形態(tài)的研究,觀察棚洞遭受損傷最嚴(yán)重的區(qū)域,為該結(jié)構(gòu)在實(shí)際工程中的使用提供更加可靠的建議。最后結(jié)合數(shù)值模擬和模型試驗(yàn)的結(jié)果,給出拱形棚洞用于工程實(shí)際的相關(guān)指導(dǎo)意見。
[Abstract]:Chenglan Railway is the most complicated railway crossing geological conditions in the history of railway construction in China at present. It crosses the Longmen Mountain area and the high mountain and deep valley area of the upper reaches of Minjiang River. The elevation difference of topography along the railway line is up to 4000m, and the proportion of tunnel in Yueling section accounts for more than 90%. In the meantime, the challenge of falling stones is very serious. Based on this background, first of all, six typical tunnel openings are investigated, and the data of the slope and rock fall are obtained, and the impact velocity and influence range of the rock fall are calculated. Then, on the basis of field investigation, the dynamic finite element software LS-DYNA is used to simulate the rock falling impact of the frame shed tunnel. The main contents are as follows: 1 the dynamic response of the frame shed tunnel under different impact energy; (2) Research on impact resistance of light soil compared with ordinary soil, 3 study on optimum thickness of light soil cushion for frame shed tunnel; After doing the above work, this paper puts forward the concept of the arched shed cave from the structure form, and designs the arch shed cave according to the situation of the field. In the same way, the finite element software LS-DYNA is used to calculate the mechanical quantity under the impact of rock drop, and the results are compared with those of the frame shed tunnel. On the basis of comparative study, after obtaining that the arch shed tunnel has the characteristics of more shock resistance, the indoor model test of the shed tunnel subjected to rock fall impact is designed, considering different working conditions, focusing on the strain and impact force of each part of the arch ring. The displacement is monitored and the law of each physical quantity is obtained. Finally, the damage form of the model is studied, and the most damaged area of the shed hole is observed, which provides more reliable suggestions for the use of the structure in practical engineering. Finally, combined with the results of numerical simulation and model test, the relevant guidance of arch shed tunnel used in engineering practice is given.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U452

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

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本文編號(hào)：2422047