Inrush Of Water And Clay Disaster Mechanism And Application Research On Politic Fault Fracture Zone Tunnel

With the rapid development of highway and railway for transportation infrastructure,the mountains,lakes and other forms of strata were crossed in the process of building.Tunnel is the most common way to cross the strata of above-mentioned.Because our country has a vast area,there are many different kinds of topography and complex geological conditions.The bad geological for karst,fault fracture zone etc have a large number of existence,the tunnel easily happens geological disasters when they cross bad geology.Argillaceous filling fault fracture zone is one of the most hazardous geological structures to the tunneling and underground engineering.Argillaceous filling fault fracture zone usually have the characteristics of complex composition,low intensity,weakening collapse,wide fracture distribution,irregular groundwater migration.When the tunnel through the bad geology,it is easy to appear the geological hazard of collapse and inrush of clay and water under the joint action of in-situ stress,water stress and the excavation disturbance.It reduces to delay time limit for a project,destruction of the machinery,surface subsidence and destruction of the tunnel site area ecological environment,even casualties.So,it has guiding significance to study mechanism of fault fracture zone tunnel inrush of clay and water for the disaster warning and treatment theory and lay a foundation for the study of tunnel construction safety science.Theoretical analysis,model test,numerical simulation and engineering application were adopted to study geological features of the fault,disaster mode and dynamic mechanism of inrush of clay and water,the disturbance forms of fault fracture zone and parameters in geotechnical engineering before and after treatment about evolution of the disaster.The following related research achievements:(1)Based on the typical characteristics of fault fracture zone inrush of clay and water,geological characteristics of disaster occurrence were researched and the influence of groundwater was analyzed emphatically.According to different types of catastrophe mode,engineering geological characteristics and hydrogeological characteristics was researched to analyze the way of influence and the characteristics of destruction for disaster.Fuzzy mathematics was used to analyze the main causal factors of disaster of fault fracture zone,and various factors influence on disaster contribution value and scale were received.(2)On the basis of uniform original pressure distribution of the tunnel of surrounding rock,weakening-deformation catastrophe theory model of fault fracture zone of rock and groundwater coupling interaction under the influence of artificial disturbance.The theory of elastic-plastic mechanics and hydromechanics were used to research inrush of clay and water evolutive law and influence factors of different catastrophe mode for fault fracture zone.Based on the effect of energy accumulation and dissipation,combine 3d geological disaster variant nonlinear mechanics model with catastrophe theory were established to research the relation between the total energy of tunnel system and the scale of inrush of clay and water.(3)A large scale 3d model test system of inrush of clay and water for tunnel catastrophe mechanism was established to restore the real geological hazard-formative environments maximally.The test system was used to carry out the tunnel inrush of clay and water and collect the data information in the test.Disaster evolution process which includes stress field,displacement field,seepage field was researched to reveal the different stages time effect influence law of the physical field parameters in geotechnical engineering for fault fracture zone.According to the catastrophe mode of test,the failure pattern and the perturbation bounds of surrounding rock in the process of inrush of clay and water were researched.(4)Based on the geological mechanical model test results,Physical and mechanical parameters of surrounding rock and the particle loss law under the excavation disturbance were analyzed to reveal the weakening-deformation mechanism of the surrounding rock under the comprehensive action of engineering disturbance and groundwater.The method of numerical analysis was used to reveal the permeability of rock mass structure and channel evolution law of inrush of clay and water.The criterion of a disaster in inrush of clay and water was established and to determine the release energy of disaster.(5)Based on Yonglian tunnel for Jilian highway in Jiang Xi province,a variety of methods were used to investigate the disaster occurrence environment of inrush of clay and water and evaluate the possibility of disaster.According to the disaster mechanism of Yonglian tunnel,the grouting treatment plan was formulated.The parameters of the surrounding rock were analyzed between before grouting and after grouting.