【作者】 王恒；

【导师】 赖金星； 王万平；

【作者基本信息】 长安大学 ， 交通运输工程（专业学位）， 2015， 硕士

【摘要】 随着我国综合国力的不断增强,交通基础建设的速度在不断加快,而隧道的建设是交通基础建设的重要一部分。由于我国大部分地区处于丘陵山脉地区,为了提高运输效率,必要的隧道建设起到了重要的作用。然而,在隧道建设过程中,由于山岭隧道围岩的属性变化较大,尤其是遇到一些特殊情况,例如涌水,断层,软弱围岩等不良地质,给隧道的施工带来了很大的困难。本文以金盆湾隧道为研究对象,研究了含水特性对隧道围岩稳定性的影响。首先通过对金盆湾隧道现场围岩压力、钢支撑应力、拱顶沉降的监测结果进行分析。然后通过建立数值模型,分析了渗透系数及孔隙比对围岩稳定性影响。最后基于现场隧道开挖工况,建立三维数值模型,通过拱顶、拱脚沉降及拱腰、边墙收敛及围岩压力随开挖步骤的变化趋势,分析了隧道开挖对围岩稳定性的影响。并对比分析了有无含水作用,对隧道围岩稳定的影响。并通过对比分析数值模拟与监测结果,验证了模型的合理性,进而为相似工程施工设计带来了一定的指导意义。更多还原

【Abstract】 With the increment of the comprehensive national strength, the speed of the transportation infrastructure increase quickly, and the construction of the tunnel is an important part of the transportation infrastructure. Due to most of the region locates in the areas of hilly and mountain, the necessary construction of the tunnel plays an important role in improving the efficiency of transportation. However,, due to large difference of surrounding rock mechanical properties during the process of tunnel construction, especially in some special circumstances, such as water, fault, as well as the weak surrounding rock and so on, it brings great difficulties to the construction of the tunnel.In this paper, based on the Jinpenwan tunnel, the effects of water properties on stability of surrounding rock in tunnel are studied. Firstly, the monitoring results of Vault subsidence, the stress of steel support and pressure of surrounding rock are analyzed. Secondly, based on the numerical simulation methods, the numerical model is established, the effects of permeability coefficient and void ratio for surrounding rock on the stability of surrounding rock in tunnel are studied. Finally, based on practical case of tunnel construction, the 3D numerical model is established, the subsidence of vault and arch foot, the convergence of hance and sidewall, and the pressure of surrounding rock in tunnel are studied by numerical simulation. The stability of surrounding rock is analyzed with water and without water environment. The numerical results are compared with the monitoring results. The rationality of numerical model is verified. It provides the help to the construction of tunnel in the similar engineering.更多还原