拉日铁路甫当隧道边坡稳定性分析及洞身线位横向控制
发布时间：2018-09-10 17:46
【摘要】：新建拉萨至日喀则铁路地处北纬29°00'～29°30',东经89°25'-90°45',修建在我国西南方的青藏高原上。线路逆雅鲁藏布江而上,沿途穿越了雅鲁藏布江峡谷区和地热区,面临着岩质高边坡的稳定性问题以及高地温现象等众多地质问题的考验。本文以新建拉日铁路甫当隧道为研究对象,在翻阅大量资料和深入了解研究对象所处的区域地质背景的情况下,结合现场地质调查,对雅鲁藏布江大峡谷地区高陡边坡的地质发育情况、受力特征和影响因素进行了系统分析和归纳总结,并对该区域存在的高地温现象以及隧道开挖后产生的偏压现象进行综合分析。首先采用巴顿模型法确定岩体结构的力学参数,结合赤平投影法和有限元分析方法,对岩质高边坡的稳定性进行分析评价,然后运用有限元法、力学强度分析法等对隧道洞身的偏压状况进行分析,然后作出应力差等值线图来对比处于推荐位置的隧道洞身以及分别外移和内移后的隧道洞身的偏压情况,最后运用有限元法对隧道的推荐线路位置、外移线路位置以及内移线路位置分别进行地温预测,根据地温预测结果,再结合上述的偏压分析结果,对隧道的三个通过位置进行综合分析评价,最终通过线位比选确定隧道的最佳通过位置并为相关工程提供参考建议。
[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 掳30 掳N latitude and 89 掳25- 90 掳45 掳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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452.11
本文编号：2235163
[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 掳30 掳N latitude and 89 掳25- 90 掳45 掳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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452.11
【引证文献】
相关会议论文 前1条
1 杜时贵;;岩体结构面抗剪强度综合评价[A];工程地质力学创新与发展暨工程地质研究室成立50周年学术研讨会论文集[C];2008年
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