| With the development of China’s southwestern region of the majority of thetransportation industry, more and more tunnels must through karst water-rich region,rtunnel surrounding rock’s mass stress and displacement fields inthe karst areas alwaysaffected by seepage field, groundwater seepage will further expand the scope of tunnelsurrounding plastic damage zone, thus affecting the stability of the surrounding rock.Therefore, study on the stability of tunnel surrounding rock in the fluid-solid couplingeffect is significant.Firstly, on the basis of an extensive collection of literature and theoretical research,discusses the role of integrated effects of groundwater in karst tunnel surrounding rocktunnel, including the weakening of the role of rock mechanics and groundwater effects,in-depth analysis of the rock under the water coupling, seepage field and stress fieldinteraction. Thick-walled cylinder subjected to uniform pressure elastic-plastic solutionis based on a comprehensive consideration of groundwater flow and the initial stressfield of surrounding rock stability of karst tunnels were elastic-plastic theory analysis,given the karst seepage tunnel lining and stress and displacement of rock plastic zoneanalytical formulas.By considering the coupled fluid-structure interaction effects, the use of finitedifference software FLAC3D, from the perspective of stress, seepage, anddisplacement fields of plastic zone around the tunnel excavation depth analysis of thetunnel, water levels and other factors on the tunnel wall rock surrounded affect thestability of the rock.Finally, Nanshan tunnel through karst water-rich zone is used for numericalsimulation, and the tunnel site monitoring data analysis and comparison, the analysisin the construction process and supporting structures surrounding rock stability of theforces.Results obtained by numerical simulation of this paper, for the stability ofsurrounding rock tunnel through karst-rich water analysis has important referencevalue. |
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