戚家垭隧道围岩位移监测及稳定性分析

发布时间：2018-07-07 21:17

  本文选题：铁路隧道 + 位移监测　； 参考：《中国地质大学（北京）》2014年硕士论文

【摘要】：随着国民经济的飞速发展，我国加大了对公共基础设施的建设，尤其在公路、铁路等交通基础设施方面。近几年，建设隧道工程的地质与环境条件更加复杂，设计与施工难度加大，国内外很多学者和专家对铁路隧道都做了大量的研究，通过理论分析、模型试验、现场测试、数值模拟等手段并取得了一些成果。但由于现有的隧道围岩稳定性判断理论和方法尚不成熟，一般隧道的判定依据主要是围岩位移速度的变化，而对于地质条件、施工环境复杂的隧道，还是主要结合现场的监控量测进行判定。因此，，对铁路隧道开挖变形和稳定性研究成为当今岩土工程中的一个重要课题。 本文以戚家垭隧道为背景，主要研究工作及取得的成果有： （1）总结了铁路隧道围岩变形监控量测的手段及围岩稳定性评价方法，分析了围岩破坏的影响因素。 （2）结合戚家垭隧道的地质条件、地层岩性、水文地质条件、不良地质现象和现场施工方法及工艺，分析了该隧道围岩的破坏机理和影响戚家垭隧道围岩稳定性的主要因素。 （3）对现场监控量测数据（隧道典型断面的拱顶下沉量及收敛位移量），选取最优函数并对测点位移数据做回归分析。绘制了位移-时间曲线图，计算了围岩的变形速率及变形量，分析了隧道围岩的稳定性，预测了围岩的最终变形量，并确定了二次衬砌施作的最佳时间。 （4）选取戚家垭隧道Ⅲ、Ⅳ级围岩典型断面，分别对其衬砌结构受力进行了数值分析，得出了衬砌断面的轴力、剪力及弯矩，并根据衬砌结构的安全性系数评价了二次衬砌支护的稳定性。 （5）基于理论计算和数值模拟方法评价了戚家垭隧道衬砌支护结构的稳定性。
[Abstract]:With the rapid development of national economy, China has increased the construction of public infrastructure, especially in the road, railway and other transportation infrastructure. In recent years, the geological and environmental conditions of tunnel construction project are more complicated, and the design and construction are more difficult. Many scholars and experts at home and abroad have done a lot of research on railway tunnel, through theoretical analysis, model test, field test, Some results have been obtained by means of numerical simulation and so on. However, the existing theories and methods for judging the stability of tunnel surrounding rock are still immature. Generally, the determination of tunnel is mainly based on the change of displacement velocity of surrounding rock, but for the tunnel with complicated geological conditions, the construction environment is complex. Or mainly combined with the monitoring and measurement of the site to determine. Therefore, the research on deformation and stability of railway tunnel excavation has become an important subject in geotechnical engineering. Taking Qijiaya tunnel as the background, the main research work and achievements are as follows: (1) the methods of monitoring and measuring the surrounding rock deformation of railway tunnel and the method of evaluating the stability of surrounding rock are summarized. The influencing factors of surrounding rock failure are analyzed. (2) combined with the geological conditions, stratigraphic lithology, hydrogeological conditions, bad geological phenomena, site construction methods and techniques of Qijiaya Tunnel, The failure mechanism of surrounding rock of the tunnel and the main factors affecting the stability of surrounding rock of Qijiaya tunnel are analyzed. (3) for the field monitoring data (the subsidence of the arch roof and the convergent displacement of the typical section of the tunnel), the optimal selection is made. Function and regression analysis of displacement data of measured points. The displacement-time curve is drawn, the deformation rate and deformation amount of surrounding rock are calculated, the stability of surrounding rock of tunnel is analyzed, and the final deformation quantity of surrounding rock is predicted. The optimum time of secondary lining construction is determined. (4) the typical sections of grade 鈪

本文编号：2106305