Effect Of Seepage Water On Stress And Displacement In Surrounding Rock Of Tunnles

In the process of tunnel excavation, fluid-structure interaction problems will begenerated due to the impact of groundwater. Tunnel excavation will lead to changes inseepage field, rock redistribution of internal stress field and displacement field. Sofluid-structureinteraction problem in theprocess of tunnel excavation isan important issue.To study the tunnel seepage water dynamics influence on rock, methods of numericalsimulation theoretical analysis and experimental data analysis are used in this thesis. Theconclusion ofthis thesis was verified in aproject inDalian Metro section.Themain contents ofthesis are as follows:(1) Research of fluid-solid coupling theory about surrounding rock and structure in theconstruction oftunnelsFluid mechanics, rock mechanics, elastic-plastic mechanics, structural mechanics,groundwater dynamics and other related knowledge is used to study basic equations ofseepage field, solving formulas of seepage under the influence of groundwater, buildingcalculation equation of stress field on surrounding rock under the effect of seepage field. Byanalyzing the characteristics of the pore force under the action of groundwater, we construct anonlinear fluid-solid coupling mathematical model of porous media. Then, based on in-depthstudy of seepage field and stress field coupling mechanism, the paper further studies thecharacteristicsand methods forsolving thesemathematical models.(2) Analysis of the distribution characteristics on seepage field of surrounding rock aftertunnelexcavationBy analyzing the contours of pore water pressure about surrounding rock after tunnelexcavation, some laws are summed up, such as the distribution law of seepage field, the lawabout impact of seepage to tunnel surrounding rock stress field distribution and surroundingrock deformation in the tunneling process and the law about land subsidence caused byseepage. These laws can be used to provide a theoretical basis for supporting disasterprevention and mitigation excavation andtunnel safety.(3) In this paper, the numerical simulation is used comparative analyzing of themeasured data theoretical calculations to verify the reliability of the finite differencenumerical simulation about coupling problem of seepage field and stress field on shieldtunneling.The reasonableness ofcalculated results are verified,too.