Shaking Table Test Study On Anchorage Interface Shear Action Of Bedding Rock Slope With Interlayer

The good anti-seismic properties of anchored slopes have been fully verified in previous earthquake disasters.However,up to now,there are few reports about experimental studies on the seismic dynamic response of anchored rock slopes.Based on the shaking table test of the anchored rock slope,the study on the shear action of bolt-mortar interface and mortar-rock mass interface under earthquake is still blank.To explore the dynamic response mechanism of anchored rock slope under earthquake and reveal the distribution law about shear action of anchor-mortar interface and mortar-rock interface,it has important theoretical significance and engineering application value to study the seismic design and rock anchoring mechanism of slope anchorage engineering.In view of this,this paper took a bedding rock slope with weak interlayer as the research object.Based on the similarity theory,and by developing similar materials,a bedding anchored rock slope model with weak interlayer with a similar ratio of 1:8 is designed and made.and a large scale shaking table test is carried out.The seismic dynamic response of the anchorage system and the effect of ground motion parameters are systematically analyzed,and the distribution of shear action on the bolt-mortar interface and mortar-rock interface are studied.The main work and research results are as follows:(1)The similarity relation design of the slope model,the development and selection of similar materials,test system,the design of the model box,the boundary treatment of the model,anchor fabrication and strain gauge attachment,sensor and anchor installation,slope model placement,test loading scheme,test procedure and other specific aspects are introduced in detail.A complete set of design methods and manufacturing techniques for the shaking table model tests of anchored rock slopes have been formed,which can provide references for similar tests.(2)The dynamic response of the anchor system in bedding anchored rock slope model with weak interlayer is analyzed.The order of force of the anchor system in the bedding anchored rock slope model with weak interlayer is obtained.The axial force of bolt and the distribution law of anchorage interface shear stress are revealed.The weak parts of the anchorage system is pointed out,and the suggestion for the reinforcementof the slope under earthquake is given.In addition,the transfer of peak shear stress at the anchored interface is analyzed,and then it is determined whether debonding occurs between the anchored interfaces.The phenomenon that the interface shear stress peak decays toward the anchor head and the anchor rod quickly is pointed out.And on this basis,it is concluded that the length of the bolt was no longer a critical factor in the seismic design of bedding rock slope with weak interlayer is concluded.Additionally,in view of the low tensile strength of mortar,the improvement of mortar material is suggested.Considering the suddenness of dynamic instability failure of bedding rock slope with weak interlayer,its stability monitoring is recommended to be strengthened.(3)Using the control variable method,the effects of different wave types,amplitudes,and excitation directions on the anchorage interface shear action are investigated.The differences of the interface shear action between different wave shapes are obtained.It is found that the vibration intensity had a significant effect on the interface shear action,and the relationship between the excitation direction and the interface shear action is recognized.