Numerical Analysis Of Tension-type Stress-concentration Cable And Stress-dispersed Cable

Prestressed anchor has been widely applied with the construction of many residential, roads, tunnels and other infrastructure projects. Stress concentration type cable applications in engineering the most common, but Stress concentration does not meet the requirements of type cable carrying capacity in some of the more weak rock layers. So many projects choose to use stress-dispersed anchor to reduce the anchorage length. There are many factors influence distribution anchorage segment cohesive force. Even some of the factors interaction in certain circumstances can influence distribution anchorage segment cohesive force.Based on the research achievements of many scholars, the article study the tension-type dispersion adhesive anchorage force distribution segment. The article use of finite difference software FLAC3D modeling calculation, and change the design of shoring common parameter values.The parameter select adhesion and shear modulus of soil, also prestressed anchor and bond strength of grouting anchoring section. In the case of a single variable, analysis and comparison anchoring segment cohesion distribution methods and cohesive force peak size of tension-type stress-concentration cable and stress-dispersed cableSummarize simulation results are as follows:(1)In the model analysis, when changing the value of the soil cohesion, distribution on anchorage segment adhesion is not very obvious, soil cohesion values varied from24kPa-30kPa(2)After prestressed value changes with increasing prestressing, the adhesive force distribution anchorage segment length becomes longer, under the model parameters, the maximum bond strength values did not change significantly, change the range of values for the single prestressed beams applying40kN～120kN;(3)In the numerical simulation of the model, with the increase of soil shear modulus, the binding power distribution of dispersed anchor cable anchorage section change is not obvious, soil shear modulus is within range of9.6to38.4MPa.(4)In the numerical simulation of the model, with the increase of mortar bond, the binding power concentration ratio of stress dispersed anchor cable anchorage section is improved continuously. And its maximum binding power value is improved correspondingly. When mortar bond strength doubles, the length of binding power distribution in the anchorage section decreases about40%, maximum binding power of anchorage section increases of about40%.(5)By comparing the binding power distribution in anchorage section of the stress concentration anchor cable and stress dispersed anchor cable obvious conclusion can be drawn:the binding powerstress in dispersed anchor cable is more even. Compared with stress concentration anchor cable, its stress concentration length deacreases50%, but maximum binding power of them is basically the same.