Underground Cavern Prestressed Bolt Support Mechanism And Design Parameters To Determine The Method Of Study

Being a high efficiency and good economically cavern-supporttechniques, prestressed anchor support has been widely used indifferent underground project but, for complexity of interactionbetween anchor rod and adjoining-rock, it is still in exploring stageabout the research of both prestressed anchor support mechanismnd verify design parameter method .To the present, it is still usenormal mortar anchor design whose theory is seriously late for thepractice.Beginning with theory of adjoining rock support characteristiccurve, this paper base on the force-bearing character, supportmechanism, analyze result of support both presrtessed anchor andnormal mortar anchor, and offer the method of veritying designparameter of prestressed anchor support. therefore, test with loadand unload washer mortar anchor, prestress anchor in differentcoefficient of confinement pressure, observing anchor rod's axialforce distribution, cavern constriction displacement, adjoiningstress field both laboratory correlation model experiment and in-situobservation. The data show the new technique used is appropriate.As a more practice design, prestressed anchor support is usedin Shang-Nan road tunnel which possesses fine technical effect andmore economic benefit, so it is being payed much attention to andmade wide use of.