Study On Analysis Of Influence Factors Of Anchor Beam Stiffness Change

With the continuous improvement of the supporting technology of coal mine,it is more systematic in terms of type,support theory,construction technology and strength of bolt.But at present,the research on the stiffness of the composite structure of the bolt(cable)is not deep enough,so this paper will further study on the anchorage stiffness of the support.Firstly,the general situation of the development of anchor and anchor support technology at home and abroad,the classification and characteristics of anchor cable,and the support theory of bolt(cable)are briefly introduced.Secondly,this paper mainly introduces the anchor cable support on the mechanical properties of surrounding rock and the effect of factors influencing the stiffness of bolt(cable)(mainly from the length and density of support,"three path",with the anchor length,anchor(cable)preload,combined bolting with cable anchor in five aspects),and a detailed analysis of one by one.The establishment of the Moore-Kulun elasto-plastic model,by changing the bolt spacing,different anchor spacing,anchor length,density of support and bolt(cable)support parameters,using FLAC3D simulation under different loading conditions,the displacement model of center point.The influence of different factors on the stiffness of anchor is analyzed.Finally,put forward some measures to improve the anchor stiffness,including:bolt(cable)to choose reasonable layout,bolt(cable)support,a reasonable "three path",and control of prestress loss,to ensure the anchorage body stiffness at the same time,put forward reasonable(anchor rod cable)arrangement,bolt(cable)length,bolt(cable)combination.It provides a reasonable theoretical reference for coal mine support,which can guide the production practice,obtain better economic results and reduce the working intensity of workers.In this paper two Xinji Mine 2611 face machine roadway support and roof separation monitoring results of bolt and bolt(cable)factors of the combined support after the anchor stiffness effect.