Study On Shear Action Of Anchorage Interface Of Pingdingshan Expansive Soil Slope Under Earthquake Action

Anchorage as one of the most important means to reinforce the slope,scholars at home and abroad have done a lot of research on the mechanism of anchorage system under the static action,so that people have a systematic understanding of the mechanism of anchorage,but the dynamic action of anchorage mechanism research has just started,seriously restricting the development of practical engineering.In order to prevent the recurrence of this kind of geological disaster,in recent years,exploring the anchoring mechanism of expansive soil slope under dynamic conditions has gradually become the focus of research in the field of anchoring technology of geotechnical engineering.Under dynamic conditions,the essence of the stability of the anchorage system is that the external load force is always less than the ultimate bonding strength of the anchorage interface.However,the ultimate bonding strength of the anchorage interface is often reflected by the shear stress at the interface.Therefore,the distribution and variation of the shear stress at the interface is an important research content of the anchorage mechanism.However,for the study of interface shear stress,most scholars only stay at the mortar-soil interface,while in the actual engineering,the anchoring force of the bolt consists of the separate action of mortar-soil interface cohesion,the bar rod-mortar interface cohesion and the coordination between the two.Based on this,the distribution of shear stress at the rod-mortar interface and the mortar-soil interface in the anchorage expansive soil slope under the action of earthquake was studied for the first time by using the FLAC3D numerical simulation software.The main innovative researches are as follows:(1)this paper attempts to modify the Cable element modeling and improve the interface shear stress extraction method to obtain the shear stress on the two anchorage interfaces of the expansive soil slope for the first time.(2)the change law of shear stress of bolt's rod-mortar interface and mortar-soil interface with earthquake duration was systematically studied,and the dynamic response of the slope was analyzed in depth,and the transmission mechanism of the force between the two interfaces in the failure process of the slope was scientifically expounded.(3)by changing the anchor bolt length,anchorage angle,vertical distance,mortar layer thickness,reinforcement diameter,anchorage parameters is studied in two interface shear stress,the interface adhesion of anchor bolt length,slope displacement response and the influence of plastic strain penetration length of slope,there is no doubt that the anchoring mechanism of expansive soil slope stability under the action of the earthquake and seismic design of the slopes are very meaningful.(4)the correlation coefficient between each anchorage parameter and the maximum horizontal permanent displacement,shear stress peak and plastic strain zone penetration rate of the slope is analyzed by weight analysis method,and the influence weight of each anchorage parameter is obtained,which can provide reference for anti-seismic construction design of expansive soil slope.The above research results can provide guidance for the follow-up large-scale shaking table test.Figure[37]table[4]reference[81]...