Experimental Study on Shear Mechanical Characteristics and Parameter Optimization of Anchoring Interface
In order to strengthen the support performance of soft rock roadway and improve the anchor support design and its parameters,the interface mechanical characteristics and failure damage mode of the anchoring system were investigated ex-perimentally,and FLAC3D numerical simulation method was used to analyze and investigate the deformation of the surrounding rock,the anchor force and the distribution law of the plastic zone with the anchoring agent and the anchoring length as the re-search parameters,so as to determine the scientifically reasonable support parameters of the soft rock roadway.The experimen-tal study shows that:the shear mechanical properties of the steel-anchor interface,with the anchor from the M20 mortar material for high fiber content ECC-2%material,the peak shear stress of the interface rose 122%;when the anchor-rock interface bond strength is high enough,the main factors affecting the stability of its own tensile strength of the rock and cohesion;when the type of anchor ECC-2%and anchorage length of 2.2 m of the support.When the support parameters of ECC-2%and 2.2 m an-chorage length are adopted,the displacement and deformation of the roof plate,the displacement of the two gangs,and the range of the plastic zone are reduced by 12.9%,29.15%,and 20.0%,respectively,and the maximum axial force of the anchor rods is increased by 95.5%compared with that of the pre-optimization scheme.The results of the study provide a scientific basis for the optimization of the support parameters of weak perimeter rock,and have reference value for the support design and optimi-zation of similar projects.
万方数据
维普
