Research On Prestressed Anchoring Technique In Cracked Rock Slope

Slope reinforcement with prestressed anchor has been widely used in rock and soil engineering, which has been proved successful, the same was its theory. But due to the complexity of rock and soil engineering, its technique still had some problems, such as anchorage effect, anchorage mechanics, prestress loss rule, analysis of outside bearing system, and working status of prestressed anchor on the cracking of the slope.To the problems of slope reinforcement with prestressed anchor, combined with the practical slope reinforcement project of K81 high slope of Jinliwen express way, by means of geological investigation, in-situ testing, physical and numerical modal simulation and theoretical analysis, the use of prestressed anchor, its effect and mechanics in cracked rock slope were studied.By the investigation and analysis of distribution and cause of cracked rock, the latent landslide mode was analyzed, the stability of the slope was estimated, and the main factor to influence the slope stability was found, which provided credible basis to the design of slope reinforcement.With physical modal simulation, the anchorage effect was analyzed, the interaction of multi anchor, prestress loss process of the cable, stress distribution in the slope on and after tensioning were studied. Physical modal was designed to simulate the push on back of the slope to research the working status of the reinforced slope with prestressed cable. In this experiment, the displacement of the slope as well as the cable prestress and soil stress was measured, and their change rules were obtained, then the working status of the slope under push on its back was studied. The devastating modal under strong seepage in the slope designated the increase of stabilization to the slope by the prestressed anchor.By numerical simulation, the mechanics of prestressed anchor was found out, and design rule was established.Based on the systematically monitoring and analysis in the project, the prestress loss after lock, short-term, as well as long-term prestess change rules were studied, and also the influence of rainfall to the cable prestress state was monitored and discussed. The common prestress loss rule was found out. Based on coupling of long-term prestress loss of anchor and slope creep, a new mode was built and the theoretical function of long-term prestress variation was put forward. To the outside bearing system of prestress anchor projuects, frame beams with...