Study On The Fluid-solid Coupling Effect And Stability About The Tunnel Surround Rock

The tunnel surrounding rock exists in certain geological environment, in theprocess of geological history, because it suffered many geological tectonic movement,there are many structural planes such as joints and fissures in, combined with stressfield, seepage field and other physical fields in joint action, which makes the stabilityanalysis of tunnel surrounding rock difficult. Therefore, the stability analysis of tunnelsurrounding rock is always classical, important and difficult topic in geotechnicalengineering problems, especially the stability evaluation methods, the forecast ofdeformation control, and waterproof measures.fluid-solid (Stress field and seepage field) coupling effect is a very complicatedproblem, it mainly manifests two aspects: on the one hand, action of stress field andseepage field will change with time and space direction; On the other hand, fluid-solidcoupling effect is the dynamic change process, because of the interaction betweenstress field and seepage field, in addition, in the process of geological history, due tothe geological tectonic movement and the influence of human activities, structureplanes of Tunnel surrounding rock are discontinuous, which makes rock mass in theaspect of mechanical performance and permeability show the complexity anduncertainty. Therefore, with the constant improvement of the development andunderstanding, the research on the stability of tunnel has been changing graduallyfrom a single physical field to physical fields coupling.Based on Nan Anzhuang tunnel project of Zhang Zhuo highway, thoughCOMSOL Multiphysics numerical analysis software, this paper analyzes andresearches the characteristics of stress, displacement and seepage of the tunnelsurrounding rock, under the stress field, seepage field and fluid-solid coupling, so asto control deformation, and predict deformation of the tunnel surrounding rock, andput forward suggestions for waterproof measures, the main research results are asfollows:(1) Though numerical analysis software, to analyze the characteristics andchange rules of stress, displacement and seepage, under the stress field and seepagefield, especially the stress and displacement of key positions on tunnel.(2) Under the fluid-solid coupling, numerical simulation of tunnel is carried on,the characteristics and change rules of stress, deformation and seepage are analyzed,and the interaction action of the stress field and seepage field is researched at the same time. The analysis and research result is as the reference and proof for controllingdeformation and waterproofing of the tunnel.(3) Based on the numerical analysis result of the surrounding rock underfluid-solid coupling, suggestions on the lining and support structure of tunnelsurrounding rock were put forward; and the waterproof material selection,arrangement, location, spacing were proposed in the tunnel waterproof measures.(4) Based on monitoring data on deformation of the tunnel, though MATLABsoftware, putting forward the deformation prediction model, so as to predict thedeformation of the tunnel surrounding rock a certain time in the future.