Pull Type Cable Load Transfer Law And Design Methods

With the pull type cable is widely promote the use of, the people of their design more and more attention .As the complexity of the geological layers and other reasons, There is no anchor an accurate and practical method for engineering design services. Now works in the use of some of the experience or simplify the calculation, are obtained in the ideal case out.Firstly, through access and analysis of large amounts of data, based on ,A three-phase linear model to describe the shear stress and shear displacement relationship, and deduced the three-stage linear model expressions, Then using shear stress - shear displacement curve, the load transfer method developed by means of a shear stress and the relationship between the anchorage length, obtained along the length of the shear stress distribution anchorage law and verified by examples.Then use three-stage linear model, calculated by the analysis of examples to prove the existence of the effective anchorage length, then further study the different layers of the effective anchorage length of cable, To rocks, hard soil, soft soil layer of these three common example of these three layers on the effective anchorage length of cable, and by anchoring section - friction curve has been calculated roughly three layers effective anchorage length, the rock is 2m, hard soil for the 13m, soft soil to 35m.Then come the basis of the effective anchorage length, using the effective anchorage length of the anchor segment derived the average frictional resistance, and to three common soil (rock, hard soil, soft soil), for example, introduced the average friction relationship with the ultimate bond strength, and reached an average of the three layers and the ultimate bond strength of friction between the expressions have the same conclusionτ|- = 0.29τ_max.Finally, ultimate bearing capacity calculation methods based on the reference effective anchorage length and average friction between these two parameters, the equivalent alternative method proposed new method of calculating the ultimate bearing capacity Fu_lt =τ|-πDL_c.