The Work COndition Assessmeent Technical Research Of Anchorage Structure Of Highway Slope After Wen Chuang Earthquake

In recent years, the form of anchor has diversified development trend as the anchor structure of highway slope used more and more widely.The safety of the anchor is not guaranteed because of the human factors (design, construction stage is not reasonable, etc.) and some natural factors (earthquake damage,etc.) under the influence of anchor structure, which leading some potentially dangerous.In access based on the literatures,this thesis rely on the technology project "post-earthquake highway roadbed, slope and retaining structure security inspection appraisal and repair reinforcement technology research" from the Ministry of Transport.The anchor structure of Duwen road is for engineering background of this thesis. The numerical simulation study of single anchor and group of anchor the stability of the slope failure is based on the field survey of anchor structure. This thesis mainly research the safety influence of the destruction of single anchor and anchor cable group of highway slope through various different types of slope anchorage structure.By study and analysis made the following progress:(1) For soil slope, whether level for practical slope, soil slope or second, single anchor prestress value loss on the slope stability influence is not particularly evident. Secondary slope, the second for slope anchor prestress function is more important.(2) For bedding rock slope, the damage is a gradual process, from initial interlayer dislocation and development for bedding vermicular slippery, finally cut out and destroyed in the bottom. Bedding rock mass slope failure type lies not only for bedding sliding, but from the initial bedding sliding gradually to collapse into music destruction.(3) For jointed rock mass slope is concerned, when joints face transfixion slope, bolting support to the influence of the loss of prestress slope is not obvious. Especially along the slope surface jointed rock direction, extends deep slope rock medium complete, slope produces only subduction effect. The size of the model is not particularly big take, it did not further to explore whether can cause geogrid tongue overthrow damage. When joints when to face no breakthrough, the stability of the slope is parallel to the great influence on slope surface jointed noodles. (4) By weak level control for the slope rock mass in weak surface, near the prestressed anchor cable, no matter whether losses, shall cause stress concentration phenomenon. Just as anchor cable pre-stress loss rate increase, the stress concentration phenomenon will further intensifies. When the arrangement for the weak shoulder and slope for breakthrough slope of the slope foot slip surface must be in potential weak surface nearby. Anchor supporting through sliding surface and length of anchorage length to deep rocks from within, but this may not words in some external force that under the action of the produce new potential sliding anchorage face.Finally, the actual engineering practice guidance, and related suggestions were gived by using numerical simulation results.