The Mechanical Behavior Of Jointed Rock Mass And Its Influence On The Stability Of Tunnel Surrounding Rock

In joint rock,rock shear slip along the joint surface is the main causes of instability and failure of tunnel,currently use most two kinds of numerical computing method for the discrete element method and the equivalent continuum method,although the discrete element method can objectively reflect the reality of the rock mass structure,but the need of the detailed calculation parameters,has a high requirement for the integrity of the rock,the computation time is long,etc.The equivalent continuum method needs to reduce the strength of the rock mass and can not simulate the physical structure.Therefore,it is necessary and urgent to propose a new modeling method and new constitutive model to analyze the tunnel surrounding rock.Phase based on the finite element software for modeling and analysis,USES the unit finite element method of joint network,studies the influence of joint rock mass stability of surrounding rock of the tunnel and the anchor rod and the stability of the lining of the tunnel control function.This paper mainly draws the following conclusions:1.Through the joint rock mechanics characteristics and failure mechanism of rock joint research,established the joint Angle,direction and distance and so on influence on the stability of the joint rock tunnel,so as to provide theoretical basis for the following modeling analysis.2.Through joint are studied by using the finite element software phase Angle,spacing,and linking with the through joint influence on surrounding rock,made a series of change law:the greater the spacing,the greater the surrounding rock stability,the greater the Angle,the surrounding rock stability before instability,not through joint is well versed in joint stability.3.establish a layered,oblique,vertical joints and a tunnel model of shotcrete-bolt support,bolting and shotcrete was studied under the action of shotcrete-bolt support,supporting parameters of joints and the effect on the stability of the tunnel,get joint tunnel stability control index changing with the supporting parameters.