双城隧道施工监控量测与开挖方法优选分析
发布时间：2018-07-23 16:16
【摘要】：随着西部大开发战略如火如荼的进行，我国高速公路的建设迎来了属于自己的春天。但是西部地区的地形、地质条件复杂，山岭和丘陵较多，山岭隧道占整条线路的比重较大，成为评价高速公路的一个重要指标。而隧道施工的安全取决于对围岩稳定状态的判断，因此隧道监控量测技术的应用变得尤为重要。本文以临夏至合作的高速公路的双城隧道为工程背景，根据施工现场的监控量测数据，对双城隧道的围岩稳定性进行分析，并借助MIDAS/GTS软件加以对比分析。本文的主要内容如下： （1）简述了双城隧道的工程概况，并结合监控量测技术的发展现状和规范要求，介绍了双城隧道监控量测方案。该方案对双城隧道监测项目的量测方法、量测频率和测点断面的布置做了详细阐述。主要结论：双城隧道的监测方案完全符合规范要求。 （2）通过对围岩稳定性判定方法和监测数据分析方法的介绍，结合隧道监控量测的控制基准，应用Origin软件对双城隧道典型断面DZK19+340的拱顶沉降和周边位移和出口段DYK19+952断面的地表下沉进行分析，并探讨了二次衬砌的最佳施作时间。主要结论： ①典型断面DZK19+340的累计拱顶沉降量和累计周边位移值符合规范要求，位移和速率随时间变化的曲线符合规律，该断面的围岩处于稳定状态。 ②出口段断面DYK19+952的累计地表下沉值符合规范要求，其下沉值和速率随时间的变化曲线符合规律。 ③典型断面DZK19+340的二次衬砌最佳施作时间为上台阶开挖后的第34天。 （3）借助MIDAS/GTS软件对实际开挖工法（台阶法）、上导坑法、全断面法的施工过程进行模拟，得出三种开挖工法在断面DZK19+340发生的拱顶沉降和周边位移，通过其与实测数据的对比分析，得出双城隧道的最合理开挖工法。主要结论： ①台阶法开挖模拟结果表明，双城隧道的围岩应力场、位移场和初期支护结构的受力均符合要求。 ②典型断面DZK19+340的累计拱顶沉降量、累计周边位移值均大于台阶法开挖的模拟值和上导坑法开挖的模拟值，小于全断面开挖的模拟值，但是三种开挖工法的模拟结果随时间的变化曲线变化均为“抛物线”型，符合规律。 ③从技术、经济和安全的角度出发，双城隧道采用的台阶法开挖及施工工序符合本工程要求。
[Abstract]:With the western development strategy in full swing, China's highway construction ushered in its own spring. However, the topography and geological conditions of the western region are complicated, there are more mountains and hills, and mountain tunnels account for a large proportion of the whole route, so it is an important index to evaluate the highway. The safety of tunnel construction depends on the judgement of the stability of surrounding rock, so the application of tunnel monitoring and measurement technology becomes more and more important. Based on the engineering background of Shuangcheng Tunnel of Linxia to Cooperation Expressway, the stability of surrounding rock of Shuangcheng Tunnel is analyzed according to the monitoring and measuring data of construction site, and the stability of surrounding rock of Shuangcheng Tunnel is analyzed by means of MIDAS/GTS software. The main contents of this paper are as follows: (1) the engineering survey of Shuangcheng Tunnel is briefly described, and the monitoring and measurement scheme of Shuangcheng Tunnel is introduced in combination with the development status and specification requirements of monitoring and measurement technology. The method, frequency and section layout of the monitoring project of Shuangcheng Tunnel are described in detail. The main conclusion is that the monitoring scheme of Shuangcheng Tunnel fully meets the requirements of the specification. (2) through the introduction of the determination method of surrounding rock stability and the analysis method of monitoring data, combined with the control datum of tunnel monitoring measurement, The dome settlement and peripheral displacement of typical section DZK19 340 of Shuangcheng tunnel and the surface subsidence of section DYK19 952 of outlet section of Shuangcheng tunnel were analyzed by using Origin software, and the optimum application time of secondary lining was discussed. The main conclusions are as follows: (1) the cumulative dome settlement and the cumulative peripheral displacement of typical section DZK19 340 are in accordance with the specifications, and the curves of displacement and velocity change with time accord with the law. The surrounding rock of this section is in a stable state. (2) the cumulative surface subsidence value of section DYK19 952 at the exit section meets the requirements of the specification. The curves of subsidence value and rate with time accord with the rule. 3 the optimum time of secondary lining of typical section DZK19 340 is the 34th day after the excavation of the upper step. (3) the actual excavation is carried out with the help of MIDAS/GTS software. Law (class law), the method of going up to the pit, The construction process of full section method is simulated, and the dome settlement and peripheral displacement of three excavation methods in section DZK19 340 are obtained. Through the comparison and analysis of the measured data, the most reasonable excavation method of Shuangcheng Tunnel is obtained. The main conclusions are as follows: 1 the simulation results of bench excavation show that the stress field of surrounding rock, displacement field and initial supporting structure of Shuangcheng Tunnel all meet the requirements. (2) the cumulative settlement of arch roof of typical section DZK19 340 is satisfied. The accumulative peripheral displacement values are larger than the simulated values of bench excavation method and upper guide pit excavation method, and are smaller than those of full-section excavation. However, the variation curves of the three excavation methods with time are all parabola type. From the point of view of technology, economy and safety, the excavation and construction procedure of Shuangcheng Tunnel by step method meets the requirements of this project.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3
本文编号：2139948
[Abstract]:With the western development strategy in full swing, China's highway construction ushered in its own spring. However, the topography and geological conditions of the western region are complicated, there are more mountains and hills, and mountain tunnels account for a large proportion of the whole route, so it is an important index to evaluate the highway. The safety of tunnel construction depends on the judgement of the stability of surrounding rock, so the application of tunnel monitoring and measurement technology becomes more and more important. Based on the engineering background of Shuangcheng Tunnel of Linxia to Cooperation Expressway, the stability of surrounding rock of Shuangcheng Tunnel is analyzed according to the monitoring and measuring data of construction site, and the stability of surrounding rock of Shuangcheng Tunnel is analyzed by means of MIDAS/GTS software. The main contents of this paper are as follows: (1) the engineering survey of Shuangcheng Tunnel is briefly described, and the monitoring and measurement scheme of Shuangcheng Tunnel is introduced in combination with the development status and specification requirements of monitoring and measurement technology. The method, frequency and section layout of the monitoring project of Shuangcheng Tunnel are described in detail. The main conclusion is that the monitoring scheme of Shuangcheng Tunnel fully meets the requirements of the specification. (2) through the introduction of the determination method of surrounding rock stability and the analysis method of monitoring data, combined with the control datum of tunnel monitoring measurement, The dome settlement and peripheral displacement of typical section DZK19 340 of Shuangcheng tunnel and the surface subsidence of section DYK19 952 of outlet section of Shuangcheng tunnel were analyzed by using Origin software, and the optimum application time of secondary lining was discussed. The main conclusions are as follows: (1) the cumulative dome settlement and the cumulative peripheral displacement of typical section DZK19 340 are in accordance with the specifications, and the curves of displacement and velocity change with time accord with the law. The surrounding rock of this section is in a stable state. (2) the cumulative surface subsidence value of section DYK19 952 at the exit section meets the requirements of the specification. The curves of subsidence value and rate with time accord with the rule. 3 the optimum time of secondary lining of typical section DZK19 340 is the 34th day after the excavation of the upper step. (3) the actual excavation is carried out with the help of MIDAS/GTS software. Law (class law), the method of going up to the pit, The construction process of full section method is simulated, and the dome settlement and peripheral displacement of three excavation methods in section DZK19 340 are obtained. Through the comparison and analysis of the measured data, the most reasonable excavation method of Shuangcheng Tunnel is obtained. The main conclusions are as follows: 1 the simulation results of bench excavation show that the stress field of surrounding rock, displacement field and initial supporting structure of Shuangcheng Tunnel all meet the requirements. (2) the cumulative settlement of arch roof of typical section DZK19 340 is satisfied. The accumulative peripheral displacement values are larger than the simulated values of bench excavation method and upper guide pit excavation method, and are smaller than those of full-section excavation. However, the variation curves of the three excavation methods with time are all parabola type. From the point of view of technology, economy and safety, the excavation and construction procedure of Shuangcheng Tunnel by step method meets the requirements of this project.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3
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，本文编号：2139948
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