【摘要】：隨著我國交通運輸業(yè)在廣大西南地區(qū)的發(fā)展，越來越多的隧道不可避免的要穿越巖溶富水區(qū)域，位于巖溶區(qū)含水巖土體中的隧道圍巖的應(yīng)力場和位移場時刻都在受滲流場的影響，地下水的滲流作用會進一步擴展隧道圍巖塑性損傷區(qū)的范圍，從而影響隧道圍巖的穩(wěn)定性。因此，研究隧道圍巖在流固耦合作用下的圍巖穩(wěn)定性具有重要的意義。 本文首先在廣泛收集相關(guān)文獻與理論研究的基礎(chǔ)上，，綜合論述了在巖溶隧道中地下水對隧道圍巖的作用效應(yīng)，包括力學(xué)作用和地下水對巖體的弱化作用，深入分析了水巖耦合下，滲流場和應(yīng)力場相互影響。以厚壁圓筒受均布壓力的彈塑性解為基礎(chǔ)，綜合考慮地下水滲流和初始應(yīng)力場對巖溶隧道圍巖穩(wěn)定性的影響進行了彈塑性理論分析，給出了考慮滲流巖溶隧道襯砌及圍巖塑性區(qū)應(yīng)力與位移解析公式。 通過考慮耦合流固耦合效應(yīng)，運用有限差分軟件FLAC3D，從隧道開挖前后的應(yīng)力場、滲流場、塑性區(qū)和位移場的角度分析了隧道埋深、水位及圍巖級別等因素對隧道圍巖穩(wěn)定性的影響。 最后，本文對南山隧道穿越巖溶富水區(qū)段進行數(shù)值計算模擬，并對隧道現(xiàn)場監(jiān)測數(shù)據(jù)進行分析對比，分析在施工過程中圍巖的穩(wěn)定性及支護結(jié)構(gòu)受力情況。 本文通過數(shù)值模擬所得到的豐富的量化結(jié)果，對于隧道穿越巖溶富水圍巖穩(wěn)定性分析具有的參考價值。
[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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451.2

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