Study On The Dynamic Characteristics Of The Micro-pile Reinforcement System For Yuandun Landslide

As landslide disasters are increasingly frequent,property damage and casualties are getting more and more serious,and the study of landslide management and reinforcement measures has begun to receive widespread attention.As a new type of landslide reinforcement method,the micro pile has few advantages at the present stage,but it has many advantages,and the micro pile has a good application prospect.In-depth study of the deformation and internal force law of micropiles under external force has important significance for the optimal design of micropiles.According to previous design examples,the design of micropiles is based on static calculations to determine the strength of the piles.The calculation results of this method are rough.However,in observing the geological environment in which the actual project is located,it is not difficult to find that most of the external forces are dynamic loads.In particular,the general landslides are located in mountainous areas where earthquakes are likely to occur.The deformation of materials caused by earthquake loads is generally nonlinear and moderately deformeed or large.Deformation,therefore,the use of finite difference software to study the ground motion of the earthquake-sliding load micro-piles reinforcement system of the reinforcement and deformation of the micro-piles for the later seismic design provides a theoretical basis.The dynamic analysis under the action of earthquake has undergone three stages before and after its development: static stage,response spectrum stage and dynamic analysis stage.This paper uses the example of Yuandun Landslide as a model for dynamic calculation and research based on FLAC3 D to obtain the pile bending moment,pile axial force,pile ear force and pile top displacement of the micro pile reinforcement system of the landslide under dynamic load conditions.Past older brothers have demonstrated that the landslide force and pile body displacement under static loading,the conclusion proves that there is not much error from the measured data,so the monitoring data after power loading in this paper has research significance.Based on the theory of dynamic analysis,the paper analyzes the engineering geological conditions of landslides,summarizes the factors that cause landslide instability according to the actual conditions,and then calculates the stability of landslides and the thrust of landslides using the slicing method,and introduces the design process of micropiles.And verified that the safety factor of this landslide example after micro pile reinforcement is in line with the specification.Based on the above research and previous scholars' verification of this landslide model,this paper uses the FLAC3 D finite difference software to calculate and analyze the landslide model.Because the software pre-processing function is weak,in order to better simulate the engineering example,this paper establishes and finite difference in the landslide geometry model.In the meshing stage,Auto CAD is used to import ANSYS.After the meshing is completed,the docking program is imported into FLAC3 D and the micro pile unit is added for load calculation.This is to clearly compare the forces of different micropiles reinforcement systems composed of connecting beams in different directions.Deformation: In this paper,the simulation experiment is divided into micro-pile structures connected by horizontal and vertical connecting beams and micro-pile structures connected by transverse connecting beams only.After adding the pile unit and applying dynamic load,512 Wenchuan wave was selected as the seismic load.After the calculation of the dynamics,the data of the monitoring point of the pile body was selected and plotted.The XY Z-axis displacement of the pile top,bending moment of the pile,pile axial force and pile were studied respectively.The curve of shear force was analyzed separately,and its own opinion on the seismic design of micro piles was put forward by combining the variation law of XYZ displacement of pile top,bending moment of pile body,axial force of pile and pile shear force combined with construction of micro piles..Through the modeling of different model groups in this paper,the force and deformation characteristics of the micro-pile system model of landslide under dynamic loading are clarified.Compared with the force and deformation of the micro-pile reinforcement system under static force,it has been further studied,It can provide the basis for the seismic optimization of the micro-piles reinforcement system,has certain engineering application value,and also provides research ideas for the stress and deformation of the reinforcement system of the same coupling beam under the conditions of changing the micro pile spacing and row spacing under the later study of earthquake.