Research on influencing factors of bearing layer range in anchor rod anchorage zone
In view of the relationship between the bearing layer range and its influencing factors in the anchor bolting,theoretical analy-sis and numerical simulation were used to carry out relevant research.Firstly,theoretical analysis was used to clarify the proportional re-lationship between the thickness of the bearing layer b in the anchor rod anchoring area and the support strength Pib at the boundary of the anchoring bearing layer,that is,the thicker the anchoring bearing layer is,the more stable the surrounding rock of the roadway is.Secondly,FLAC3D numerical simulation software was used to analyze the variation rules of the thickness and volume of the bearing layer in the anchoring area when the preload is 50,100,150 and 200 kN,and the bolt spacing is 0.8,1.0,1.2 and 1.5m,respectively.The results show that with the increase of bolt preload and the decrease of bolt spacing,the thickness and volume of the bearing layer in the anchoring area also increase.There is an exponential relationship between the bolt preload and the volume of anchoring zone.There is a critical value of bolt spacing,and when the spacing is greater than the critical value,the volume of anchoring area drops sharply.The re-search results can provide theoretical basis and reference for the parameter design and engineering technology development of bolt sup-porting.
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