Calculation theory of pullout resistance of self-screwed tube bolting In soft-rock tunnel

In the support project of soft-rock tunnel,it needs to install roof bolting in most cases.However,the hollow pouring anchorage rod and mortar bolt that are used widely in the current application exist the problems of unfilled grouting and none rapid initial anchoring force that affect the support effect and engineering safety.The Self-screwed Slip Casting Tube Bolt can solve the existed technical problems well in the project.In the support project of soft-rock tunnel,the pullout resistance of the Self-screwed Slip Casting Tube Bolt is the critical technical parameter that related to the security of anchorage system.According to the structural features and mechanism of the Self-screwed Slip Casting Tube Bolt,it discusses the calculation theory of pullout resistance in this passage that can be referenced in the actual support project.