發(fā)布時間：2018-09-10 17:46

【摘要】：新建拉薩至日喀則鐵路地處北緯29°00'～29°30',東經(jīng)89°25'-90°45',修建在我國西南方的青藏高原上。線路逆雅魯藏布江而上,沿途穿越了雅魯藏布江峽谷區(qū)和地?zé)釁^(qū),面臨著巖質(zhì)高邊坡的穩(wěn)定性問題以及高地溫現(xiàn)象等眾多地質(zhì)問題的考驗。本文以新建拉日鐵路甫當(dāng)隧道為研究對象,在翻閱大量資料和深入了解研究對象所處的區(qū)域地質(zhì)背景的情況下,結(jié)合現(xiàn)場地質(zhì)調(diào)查,對雅魯藏布江大峽谷地區(qū)高陡邊坡的地質(zhì)發(fā)育情況、受力特征和影響因素進行了系統(tǒng)分析和歸納總結(jié),并對該區(qū)域存在的高地溫現(xiàn)象以及隧道開挖后產(chǎn)生的偏壓現(xiàn)象進行綜合分析。首先采用巴頓模型法確定巖體結(jié)構(gòu)的力學(xué)參數(shù),結(jié)合赤平投影法和有限元分析方法,對巖質(zhì)高邊坡的穩(wěn)定性進行分析評價,然后運用有限元法、力學(xué)強度分析法等對隧道洞身的偏壓狀況進行分析,然后作出應(yīng)力差等值線圖來對比處于推薦位置的隧道洞身以及分別外移和內(nèi)移后的隧道洞身的偏壓情況,最后運用有限元法對隧道的推薦線路位置、外移線路位置以及內(nèi)移線路位置分別進行地溫預(yù)測,根據(jù)地溫預(yù)測結(jié)果,再結(jié)合上述的偏壓分析結(jié)果,對隧道的三個通過位置進行綜合分析評價,最終通過線位比選確定隧道的最佳通過位置并為相關(guān)工程提供參考建議。
[Abstract]:The newly built Lhasa to Xigaze railway is built on the Qinghai-Tibet Plateau in the southwest of China. It is located at 29 擄30 擄N latitude and 89 擄25- 90 擄45 擄E longitude. The route goes up against the Brahmaputra River and passes through the gorge and geothermal area of the Yarlung Zangbo River. It faces the test of many geological problems such as the stability of high rock slope and the phenomenon of high ground temperature. In this paper, taking the Newly-built Pudang Tunnel of the La-Ji Railway as the research object, after reading a large amount of data and deeply understanding the regional geological background of the research object, combined with the field geological survey, The geological development, stress characteristics and influencing factors of the high and steep slope in the Brahmaputra Grand Canyon region are systematically analyzed and summarized. The phenomenon of high ground temperature and bias caused by tunnel excavation in this area are comprehensively analyzed. Firstly, the mechanical parameters of rock mass structure are determined by using Barton model method. The stability of high rock slope is analyzed and evaluated by using plane projection method and finite element analysis method, and then the finite element method is used to analyze and evaluate the stability of rock mass high slope. The mechanical strength analysis method is used to analyze the bias of the tunnel body, and then the stress difference isoline diagram is made to compare the deflection of the tunnel body in the recommended position and that of the tunnel body which has been moved out and inside, respectively. Finally, using the finite element method, the recommended location of the tunnel line, the location of the outward line and the location of the inner line are forecasted respectively, according to the forecast results of the ground temperature, and then combined with the above results of bias analysis. Through the comprehensive analysis and evaluation of the three passing positions of the tunnel, the optimal passage position of the tunnel is determined by the line position comparison finally, and the reference suggestions are provided for the relevant projects.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U452.11

【引證文獻】

相關(guān)會議論文 前1條

1 杜時貴;;巖體結(jié)構(gòu)面抗剪強度綜合評價[A];工程地質(zhì)力學(xué)創(chuàng)新與發(fā)展暨工程地質(zhì)研究室成立50周年學(xué)術(shù)研討會論文集[C];2008年

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本文編號：2235163