Experimental And Analytical Study On Pull-out Resistance Of Adhesive Anchors

Ground anchorage is one of the important branch of geotechnical Engineering,which has been successively used for slope,foundation pit,mine,tunnel and underground engineering. Anchoring technology can increase strength and stability of rock and soil mass,guarantee safety and stability of construction,save cost of engineering,speed up the rate of construction, obtain good social and economic benefits. Based on the different ways of force transformation of steel bar and cement mortar.we divate grout bolt into three kinds: tension type, pressure type, shear type.At present, tensile anchor rods are used mostly in engineering. Transfer force of this rod is through rod with cement mortar and mortar with rock, which passes to rock and soil mass.For tensile anchor rod,the ability of bearing tensile,one is due to cross sectional area and tensile strength of rod ,it is easy to accurate design and satisfy the use requirement.another is due to pull-out resistance of anchorage body, pullout capacity of anchorage body is the key influence of bearing capacity of one rod.Because of force complexity of rod in rock and soil media,which makes design in bearing capacity of bolt is in experience.It is necessary to make easy, applied bearing capacity formula.This paper emphatically studies interface bond behavior and pullout capacity of bond anchor bolt in anchorage system through experimental research and theoretical analysis. The content is as follows:1. Steel pipe as matrix material,mortar as cementing material, do pull-out test to anchorage body composition of steel bar,cement mortar and steel pipe.there are two kind of failure forms, shear failure in steel bar and cement mortar,shear failure in cement mortar and steel pipe.make some analysis and discussion.through test curve, analysis on bond force about surface shape,diameter and ahcorage length.2. Summarize bond-slip constitutive relationship models of steel bar and cement mortar,which are simplified as trilinear model,it is good comparison of test data.3. Reference Burong Zhang and Benmokrane,B,Zhimin Wu and Shutong Yang's theoretical analysis, Two kind of theory models are all about shear failure in steel bar and cement mortar.Test data matches theoretical data well,which proves usability of two theories.4. Reference derivation process of Zhimin Wu and Shutong Yang's theory,work on the theoretic deduction about pull-out resistance of shear failure in cement mortar and steel pipe.