Finite Element Analysis Of Dangerous Rock Surface And Internal Crack Reinforcement

China is a mountainous country with a large population,vast territory,a long history of the country,with a large number of cultural relics need maintenance and reinforcement.With the development of economy and people's demand for travel,the transportation infrastructure of our country has brought great pressure.In this basic national conditions,the country choose to develop infrastructure will produce a large number of slope reinforcement.It is of great significance to select an economical and reliable method of reinforcement.In this paper,based on the above background,the method of internal crack reinforcement is put forward.In the light of the situation that the reinforcement of small dangerous rock,which is mainly non-eliminated,has the meaning of humanity,this paper puts forward the method of strengthening and strengthening the external cracks.In this paper,ANSYS is used to simulate slump failure mode of dangerous rock and the results are analyzed.The main work and achievements of this paper are as follows:(1)Based on the ANSYS design language,the model of "the surface crack and internal crack " is established.In this paper,the model of the surface crack with different reinforcement area,different dangerous rock size,different crack inclination angle,different crack internal friction angle and cohesive force is calculated,and the results are analyzed.The model of the internal crack with different anchor inclination angle,different elastic modulus of anchor,different anchor spacing,different anchor hole diameter,different anchor length,different elastic modulus of bedrock,different elastic modulus of crack was calculated,and the results are analyzed.(2)The calculation results of the analysis of surface crack reinforcement can be obtained: The internal friction angle and cohesion of dangerous rock are linearly related to the safety factor,and the influence of cohesion on the safety factor is stronger than that of internal friction angle;The size of the dangerous rock and the tendency of the fracture surface have a remarkable influence on the safety factor;The method of surface crack reinforcement is simple and convenient,but increasing the amount of reinforcing steel can not significantly increase the safety factor,and the capacity of reinforcement is limited.It is suggested that it is only used for landscape reinforcement in uninhabited areas,and is not suitable for earthquake prone areas.(3)The calculation results of the analysis of internal crack reinforcement can be obtained: Increasing the elastic modulus and length of anchor can improve the safety factor of dangerous rock.but beyond a certain value,there is no obvious effect;Increase the anchor hole diameter and spacing of anchor can effectively increase the safety factor of dangerous rock and prevent the deformation of the dangerous rock;In the upper part of the dangerous rock,the free section of the anchor is less stressed,and the partial truncation of the free section does not exert a great influence on the force.Numerical analysis shows that the method of internal crack reinforcement is effective and feasible in the dangerous rock control project.