Study On Performance Of Anti-seismic Anchor Cable Based On Static Load Test

In the protection of project, the prestressed anchor cable use is very extensive,involving the construction of water conservancy, transportation, building, energy andother infrastructure construction. In recent years, with the several earthquake disasterhappened, so the engineering sector to start thinking about the earthquake resistance ofprestressed anchor cable problem. Especially in the wenchuan earthquake, the slopefailure blocking traffic and seriously hindered the rescue efforts after the earthquake.The surveying of the wenchuan earthquake shows that prestressed anchor can betterplay a protective role and appear the destruction of the whole rarely, just part of theanchor head and frame beam was destroyed. But how to play bettre seismicperformance of prestressed anchor and study on the weak link of prestressed anchorunder the earthquake is still immature, so carry out in this area is very significance.Thispaper combining with the slope protection measures of prestressed anchor damagesurvey of wenchuan earthquake, according to the slope, tunnel engineering and othergeotechnical engineering of prestressed anchor theoretical research and the periodictransformation of the seismic wave characteristics, analyzed the response of prestressedcables on the earthquake situation. Introduced a new member of the prestressed anchorcable is the anti-seismic anchor cable and experimental study of its mechanicalproperties. The mechanical characteristics of anti-seismic anchor is allow the rockhaving mass deformation and supporting constant anchoring force.①Investigation of prestressed anchor cable protective measures damagephenomenon after the earthquake, this article through the analysis and study elaboratedfive factors of the influence of prestressed anchor cable.Put forward the main failuremodes of prestressed anchor cable under the dynamic loading, and then according to thecomprehensive comparison propose to select the structure of the pressure-type cable inthe earthquake zone.②Detailed describe the new anchor cable which is developed with pressure-typeanchor structure as foundation, and this paper introduces the basic working principleand characteristics of the anti-seismic anchor cable. The anti-seismic devices areclassified, and differert anti-seismic devices to provide ideas for futher development ofthe anti-seismic anchor cable and anti-seismic device.③Proposed two indexs, yield force and yield displacement, to evaluate the performance of the anti-seismic anchor cable. By the static load test, obtained theanti-seismic anchor single-beam yield strength for200KN, can meet the engineeringrequirements which the size of anchor force.According to creep test can be found thatthe anti-seismic anchor cable under the action of yield force will be smooth sliding, andthe yield displacement can be controlled artificially deformed by the designrequirements.④Through the distributed pressure of anchor cable of the static load test, foundthat the anti-seismic anchor which installed the anti-seismic device can make thedifferent lengths of anchor cable evenly bear loads, ultimately.⑤Compared with the static load test of single-beam and multi-beam anti-seismicanchor cable, found the slip velocity rate of the latter is slowly than the former.Themulti-beam anti-seismic anchor cable unit will have enough reaction time when theearthquake happened, and give full play to the role of buffer seismic loading. In therepeated loading test of the anti-seismic anchor cable found the Yield load of extrusionenhanced, but the increasing trend of single-beam is not obvious. Comprehensivecomparison suggest using multi-beam seismic anchor cable in engineering practice.