猴子岩水电站进厂交通洞洞口段施工技术研究

发布时间：2019-04-11 07:26

【摘要】：洞口是隧道的咽喉,其施工质量的好坏直接影响整条隧道的工程质量和进度。隧道洞口段围岩一般较破碎,风化严重且覆盖厚度小,因而围岩的自稳能力较差。施工时通常遵循“早进洞、晚出洞”的原则,以减少对洞口周边围岩的扰动,增强洞口边、仰坡的稳定性。因此,对于隧道洞口段施工,选择合理的施工方法至关重要。为了给猴子岩水电站进厂交通洞洞口工程选择合理可行的施工方法,本文通过查阅大量资料总结国内外交通隧道洞口段主要的施工方法并对各工法的适用性进行了比选,介绍了隧道洞口主要的支护措施及其作用机理。结合猴子岩水电站进厂交通洞的实际工程情况,运用数值计算方法模拟了台阶法、中隔壁法(CD法)和交叉中隔壁法(CRD法)三种工法该隧道洞口段的施工过程,对比分析了三种工法施工时的隧道周边围岩的位移、应力和塑性区分布特点以及支护结构的内力分布特征。结合三种工法的技术经济比选,推荐选择中隔壁法(CD法)作为猴子岩水电站进厂交通洞洞口段施工方法。在采用中隔壁法施工条件下,结合猴子岩水电站进厂交通洞洞口段实际工程情况,制定了洞口段详细的开挖支护方案和监控量测方案。通过分析现场实测的各项监测数据可知,中隔壁法(CD法)应用于猴子岩水电站进厂交通洞洞口段是安全可行的。本文的研究结论对猴子岩水电站进厂交通洞洞口段的施工提供了理论支持,同时中隔壁法在现场的成功应用也进一步验证了数值计算的结论。本文对软弱破碎围岩中隧道的施工力学特性有一定的研究,其结论可为今后类似的工程提供参考。
[Abstract]:The tunnel entrance is the throat of the tunnel. The construction quality of the tunnel directly affects the construction quality and progress of the whole tunnel. The surrounding rock of tunnel entrance section is generally broken, weathered seriously and the cover thickness is small, so the self-stabilization ability of surrounding rock is poor. During construction, the principle of "early entry and late exit" is usually followed in order to reduce the disturbance to the surrounding rock around the tunnel entrance, and to enhance the stability of the opening side and the elevation slope. Therefore, it is very important to select a reasonable construction method for tunnel entrance construction. In order to select a reasonable and feasible construction method for the entrance project of traffic tunnel in Heziyan Hydropower Station, this paper summarizes the main construction methods in the entrance section of traffic tunnel at home and abroad by consulting a large amount of data, and compares and selects the applicability of each construction method. The main supporting measures and mechanism of tunnel opening are introduced. Combined with the actual engineering situation of the entrance traffic tunnel of the Heziyan Hydropower Station, the construction process of the tunnel entrance section of the tunnel is simulated by means of numerical calculation method, such as step method, middle partition method (CD method) and crossed middle partition method (CRD method), and the construction process of the tunnel entrance section is simulated by the numerical calculation method. The displacement, stress and plastic zone distribution characteristics of surrounding rock around the tunnel and the internal force distribution characteristics of supporting structure during the three construction methods are compared and analyzed. Combined with the technical and economic comparison and selection of the three construction methods, the middle partition method (CD) is recommended as the construction method for the entrance section of the traffic tunnel of the Heziyan Hydropower Station. Under the construction conditions of the middle partition method and combined with the actual engineering situation of the entrance section of the traffic tunnel of the Heziyan Hydropower Station, the detailed excavation and support scheme and the monitoring and measuring scheme of the tunnel entrance section are worked out. Through the analysis of the monitoring data measured in the field, it can be seen that the application of the CD method to the entrance section of the traffic tunnel of the Heziyan Hydropower Station is safe and feasible. The conclusion of this paper provides the theoretical support for the construction of the entrance section of the traffic tunnel of the Heziyan Hydropower Station, and the successful application of the middle partition method in the field further validates the conclusion of the numerical calculation. In this paper, the mechanical characteristics of tunnel construction in weak and broken surrounding rock are studied, and the conclusion can be used as a reference for similar projects in the future.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV52

【参考文献】