基于流固耦合岩溶隧道围岩稳定性研究
发布时间：2019-03-14 17:32
【摘要】：随着我国交通运输业在广大西南地区的发展，越来越多的隧道不可避免的要穿越岩溶富水区域，位于岩溶区含水岩土体中的隧道围岩的应力场和位移场时刻都在受渗流场的影响，地下水的渗流作用会进一步扩展隧道围岩塑性损伤区的范围，从而影响隧道围岩的稳定性。因此，研究隧道围岩在流固耦合作用下的围岩稳定性具有重要的意义。 本文首先在广泛收集相关文献与理论研究的基础上，，综合论述了在岩溶隧道中地下水对隧道围岩的作用效应，包括力学作用和地下水对岩体的弱化作用，深入分析了水岩耦合下，渗流场和应力场相互影响。以厚壁圆筒受均布压力的弹塑性解为基础，综合考虑地下水渗流和初始应力场对岩溶隧道围岩稳定性的影响进行了弹塑性理论分析，给出了考虑渗流岩溶隧道衬砌及围岩塑性区应力与位移解析公式。 通过考虑耦合流固耦合效应，运用有限差分软件FLAC3D，从隧道开挖前后的应力场、渗流场、塑性区和位移场的角度分析了隧道埋深、水位及围岩级别等因素对隧道围岩稳定性的影响。 最后，本文对南山隧道穿越岩溶富水区段进行数值计算模拟，并对隧道现场监测数据进行分析对比，分析在施工过程中围岩的稳定性及支护结构受力情况。 本文通过数值模拟所得到的丰富的量化结果，对于隧道穿越岩溶富水围岩稳定性分析具有的参考价值。
[Abstract]:With the development of China's transportation industry in southwest China, more and more tunnels inevitably have to pass through karst water-rich areas. The stress field and displacement field of the surrounding rock in the karst zone are affected by the seepage field. The seepage of groundwater will further expand the plastic damage zone of the surrounding rock of the tunnel, and thus affect the stability of the surrounding rock of the tunnel. Therefore, it is of great significance to study the stability of surrounding rock under fluid-solid coupling. Firstly, based on the extensive collection of relevant literature and theoretical research, this paper comprehensively discusses the effect of groundwater on the surrounding rock of the tunnel in karst tunnel, including the mechanical action and the weakening effect of groundwater on the rock mass. The interaction between seepage field and stress field under the coupling of water and rock is analyzed. Based on the elastic-plastic solution of thick-walled cylinder subjected to uniform pressure, the influence of groundwater seepage and initial stress field on the stability of surrounding rock of karst tunnel is analyzed by elastoplastic theory. The analytical formulas of stress and displacement in the plastic zone of seepage karst tunnel lining and surrounding rock are given. Considering the coupling fluid-solid coupling effect, the depth of tunnel is analyzed from the angle of stress field, seepage field, plastic zone and displacement field by using finite difference software FLAC3D, before and after tunnel excavation. The influence of water level and surrounding rock grade on the stability of tunnel surrounding rock. Finally, this paper carries on the numerical calculation simulation to the Nanshan tunnel crossing the karst rich water area, and carries on the analysis and comparison to the tunnel site monitoring data, analyzes the surrounding rock stability and the support structure stress in the construction process. In this paper, the abundant quantitative results obtained by numerical simulation have reference value for the stability analysis of tunnel crossing karst water-rich surrounding rock.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.2
本文编号：2440201
[Abstract]:With the development of China's transportation industry in southwest China, more and more tunnels inevitably have to pass through karst water-rich areas. The stress field and displacement field of the surrounding rock in the karst zone are affected by the seepage field. The seepage of groundwater will further expand the plastic damage zone of the surrounding rock of the tunnel, and thus affect the stability of the surrounding rock of the tunnel. Therefore, it is of great significance to study the stability of surrounding rock under fluid-solid coupling. Firstly, based on the extensive collection of relevant literature and theoretical research, this paper comprehensively discusses the effect of groundwater on the surrounding rock of the tunnel in karst tunnel, including the mechanical action and the weakening effect of groundwater on the rock mass. The interaction between seepage field and stress field under the coupling of water and rock is analyzed. Based on the elastic-plastic solution of thick-walled cylinder subjected to uniform pressure, the influence of groundwater seepage and initial stress field on the stability of surrounding rock of karst tunnel is analyzed by elastoplastic theory. The analytical formulas of stress and displacement in the plastic zone of seepage karst tunnel lining and surrounding rock are given. Considering the coupling fluid-solid coupling effect, the depth of tunnel is analyzed from the angle of stress field, seepage field, plastic zone and displacement field by using finite difference software FLAC3D, before and after tunnel excavation. The influence of water level and surrounding rock grade on the stability of tunnel surrounding rock. Finally, this paper carries on the numerical calculation simulation to the Nanshan tunnel crossing the karst rich water area, and carries on the analysis and comparison to the tunnel site monitoring data, analyzes the surrounding rock stability and the support structure stress in the construction process. In this paper, the abundant quantitative results obtained by numerical simulation have reference value for the stability analysis of tunnel crossing karst water-rich surrounding rock.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.2
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本文编号：2440201
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