The Research On Mechanical Effect Considering The Coupling Of Fluid And Solid Of Red-bed Soft Rock Tunnel

The red-bed soft rock is widely distributed in North China, East China, South China and southwest China. With the construction of a large number of domestic infrastructure, the number of tunnel projects which across the red-bed soft rock area are increasing. When the water exists, the strength of the red-bed soft rock is decreased greatly, the integrity of rock is destroyed constantly, the deformation is difficult to control, these results often induce landslides, landslides and other geological disasters. At present, there are many researches on the soft rock tunnel in red beds, however, these researches are mostly focus on the mechanical parameters of rock and the control measures of tunnel construction technology, the systematic study on the influence of groundwater on the red-bed soft rock tunnel under different geological conditions is relatively less. The paper takes the tunnel of Tu Diling as the engineering background, studys on the influence of groundwater on the red-bed soft rock tunnel under different geological conditions, mainly has the following several aspects:(1) Through relys on the practical engineering and establishs the contrast conditions, the paper studys on the stress characteristics and deformation of the red-bed soft rock tunnel which considers the fluid-structure coupling effect or not, and finally gets the result of the stress characteristics and deformation of the red-bed soft rock tunnel under the action of seepage.(2) Through builds the tunnel excavation method under different geological conditions, the paper studys on the influence the red-bed soft rock tunnel under the action of seepage, the different geological conditions include different water level lines and different buried depths and different water pressure of surrounding rocks and different angle of unsymmetrial loading. And finally the paper obtains the inherent changing law of stress and deformation, and then provides the corresponding theoretical basis for design and construction of the practical engineering.(3) To improve the strength of surrounding rock and surrounding rock condition of soft rock tunnel, the way of tunnel surrounding rock reinforcement is the common methods. In order to study the influence of the red-bed soft rock tunnel which suffers the action of groundwater, the paper takes a study from three aspects, and the three aspects include the changing thickness of grouting circle and the changing permeability coefficient of grouting circle and the changing range of reinforcement. And finally the paper provides the theoretical guidance for the construction of the red-bed soft rock tunnel.(4) According to the engineering, firstly, the paper makes a study of the surrounding rock section which have rich water, the surrounding rock section include the symmetrial loading surrounding rock section and unsymmetrial loading surrounding rock section, and obtains the influence of mechanical effect of construction of the red-bed soft rock tunnel which influenced by the the action of seepage field, and then, the paper contrasts the measurement data with the simulated data in order to prove the accuracy of numerical calculation, and the elements of analysis include the vertical settlement and the horizontal displacement and the pressure of surrounding rock and the internal force of initial supporting and the internal displacement of surrounding rock.