Application Of Prestressed Cable In XiangShan Slope Treatment

Slope reinforcement with prestressed anchor has been widely used in rock and soil engineering,which has been proved successfully ,the same is its theory.But due to the complexity of rock and soil engineering ,its technique still has some problems,such as anchorage effect,prestress loss rule.To the problems of slope reinforcement with prestressed anchor,combined with the practical slope reinforcement project of NO.17 slope of xiangshan north fire line,by means of geological investigation,in-situ testing and so on,the application of prestressed anchor,its effect and mechanics in cracked rock slope are studied. By the designment of prestressed anchorage,prestress of anchor has 3 affect:â‘ Because of prestressed anchorage,the physical and mechanical properties of soil and rock are improved,which increases the stability of soil and rock.â‘¡Because of normal component force of anchorage,the shear strength of slip surface is improved,which increases the resistance of the slope body.â‘¢Because of prestressed anchorage,the fracture of rock is closed ,which increases the integrity of soil and rock.With the analysis of sticking and hole collapse,finding out the reason of this phenomenon , which the matt,non-fresh and undisturbed rock. when the phenomenon of sticking and hole collapse occurs,the drilling should be stpped,and then the drill tools should be pulled out.The grouting is used to treatment this problem.Based on the systematically monitoring and analysis in the project,the prestress loss after lock,short-term,as well as long-term prestress change rules are studied,and also the influence of temperature's changes to the cable prestress state is analyzed.The common prestress loss rule is obtained.