Study On Development Failure Mechanism And Reliability Of Prevention Measures Of The Dangerous Rock

In recent years, As the rapid development of the social economy, human living space has been extended to the mountain area. Especially,with the extension of city and the building of highway and railway in mountain area,the disaster of dangerous rock occurred more and more frequently during the past few years,and threatened the safety of the local people's life and properties.Refer to the example of dangerous rock at Shuima Highway K1+140.The author studied deformation characteristics,stability numerical methods of dangerous rock mass,movement characteristics of rolling rock in the different stages,numerical simulation analysis of rock movement state and track,contermeasures of dangerous rock mass detailedly.Followings are the dissertation's main research work and conclusions:â‘ Research on the development meehanism of dangerous rockThe development of dangerous rock mass was a progressive process step by step.In this paper,the various influencing factors of dangerou rock mass development were analyzed in detail,which included not only to pography,geomorphology,lithology and rock combination,but also weathering,erosion,cuttingvalley.Those were inducted into internal factors and external factors.The internalfactors included the geological structure motion and the nature of rock itself;theexternal factors were mainly rainfall,earthquake,gravity,weathering and humanactivities.â‘¡Research on stability of dangerous rockBased on the research on development mechanism, the author classes dangerous rock into three types from fracture, i.e: slip dangerous rock, fall dangerous rock and revolved dangerous rock.According to influence for groundwater and earthquake to steady feature of dangerous rock, the author sets fissure water distribution instrueture Plane and found stability calculation methods to every type dangerous rock, and put forward fracture mechanics Calculating methods of the dangerous rock with half a breakthrough, reinforcement mechanism of anchor is analyzed form fracture mechanics angle.â‘¢Research on route and impaction rockfalIt is well known that rock fall comes from unsteady dangerous rock.Route of rockfall is controlled by original position and unsteady mode of dangerous rock and ground features.The author divides rock fall movement into three stages, i.e: colliding,slipping and rolling,and founds movement equations every stages.The three factors,roughness,Block-stone size,and the normal,tangential recovery coefficient to the influence of falling process were analyzed with dangerous rock simulation software ROCFALL.â‘£Research on control prineipleMeasures to control dangerous rock can be clsaaed into active control,passive control system. Combined with the characteristics of rock wall,the path and wallop of the dangerous rock and specific circumstances of the example,design scheme of the rock wall is obtained.