Research On Performance Of Anti-seismic Prestressed Anchor And Its Application

Prestressed anchor is a kind of main components under tension, through thedrilling to the anchoring section fixed in deep stability of geotechnical, and producesprestressed by tensioning anchor, So as to make the anchor solid more stable and thepurpose of limiting deformation. Because the prestressed anchor has activelyreinforcement, structural lightweight, reinforced high efficiency, etc, has been widelyapplied in slope, deep excavation and other projects. At present, the researchperformance of prestressed anchor under static load is more, but studies underearthquake seismic performance of prestressed anchor still in its infancy. Thesis studiedthe failure modes of prestressed anchor under the action of earthquake, experimentalstudy on seismic performance of prestressed anchor, And conducted the field test andengineering applications. The thesis mainly work as follows:Firstly, construction, time and deformation of rock mass are analyzed three factorsaffect the performance of prestressed anchor anchorage. According to the slope after thewen chuan earthquake damage characteristic of the detailed study of the prestressedcable failure modes under earthquake, and according to the damage characteristics ofprestressed anchor analyzed the reasons. On the basis of the study proposes a kind ofapplicable to the high-intensity earthquake zone seismic cable.Secondly, has carried on the experimental study to the proposed anti-seismicanchor,through the seismic anchor performance test, obtain anti-seismic anchor yieldload, and analyze seismic anchor rope made of dispersed pressure anchor can use of itsunique structure seismic yield characteristics of the large displacement solve theproblem of anchor each mechanical reinforcement stress non-uniform. At the sametime, through the anchor tension experiment to verify the seismic anchor is able towithstand the design load in both the construction conditions and geological conditions,and verify whether the anchor tensioning process can be optimized.Finally, according to the application of seismic anchor in Bi Wei highwaysomewhere on the high slope,based on the actual engineering case, the seismic anchorcable construction and prestress anchor monitoring data of comprehensive analysis,determine the various parameters of the seismic anchor in the project, understand the anchorage performance of seismic anchor in engineering examples. Propose effectiverecommendations and improvement for the design and construction of seismic anchor.