Study on internal anchoring force enhanced technology of small diameter hole pre-stressed anchoring cable

In order to solve a low internal anchoring strength of the small diameter hole pre-stressed anchor cable and poor anchoring reliability problems existed i n the mine roadway under the conditions of the present high stress in the deep mine and the complicated environment, a site investigation and lab simulation test meth od was applied to analyze and summarized the possible failure causes of the conventional pre-stressed anchoring cable. The paper pointed out that a smooth body of t he anchoring cable was one of the important causes to cause a low reliability of the anchoring cable. Based on the above study, a internal anchoring force enhanced te chnology, namely the anchoring structure of the vane type anchoring cable was provided. The lab simulation test and the site engineering application results showed th at the vane type anchoring cable could effectively avoid the pseudo anchoring occurred when the steel strand passed through anchoring cartridge, could fully crush the polyester film packing bag of the resin cartridge, could fully and evenly mix the curing agent and the clay and could improve the internal anchoring strength of the ancho ring cable and the anchoring relibility as well as could control the high stress and the surrounding rock deformation of the complicated roadway with an obvious effect.