Study On Mechanism Of Prestressed Anchoe Rope

Pre-stressed anchor rope can sufficient bring into play itself bearing capacity, adjust and reinforce the rock and soil itself strength and stability, reduce the weight of retaining structure, thrift the engineering material, moreover guarantee the safety and steady in construction. There are remarkably economy and social beneficial, have been widely used in railroad project, road slope engineering as well as water conservancy project.Based on tested datum, a two parameters equation depicted failure shape of anchor rope is presented. Believing on this base, study on ultimate pullout of anchor rope according to ultimate balance principle and Hoek-Brown criterion, and suggested a ultimate value principle. Gave a calculation example. The results have shown that the ultimate uplift capacity is related to failure shape of anchor rope and rock type and its unconfined compressive strength and its fractured and weathered characteristics, as well as grouting material and grouting pressure etc. then, a series of formulas have given to determine the ultimate capacity and lateral resistance.Study on mechanism of pre-stress anchor rope based on shear lag model, and considered the damage of rock mass and grouting material, Through defining the shear damage variable of rock mass and grout body and suggesting the damage evolvement equation respective according to damage mechanics basic principle. Combining the general shear lag model with shear damage of rock mass and grouting body, presented the modified shear lag model. The model is applied to the research of resistance distribution and loading deformation relationship of bond section of pre-stress anchor rope , Experimental results are in good agreement the theoretical prediction.Based on the foundation principle of damage mechanics, to define the shear damage variable of rock and the tensile damage variable of grouted material, and build the damage evolution equations corresponding, and determine the load transfer controlling differential equation of bonding section on base of tensile damage of grouted material, to combine rock shear damage with general shear displacement method to study the load deformation property of bonding section of pre-stressed anchor rope.First of all by pre-stress group anchor ropes ( cemented of pull style) resolves into two subs -system: the stabile rock stand side resistance load and inner bonding section stand lateral resistance load and pres-stress load. Then, Carrying on every sub- system the discretization and more assumes that different tiny section possess uniform side resistance distribution, afterwards research separately by two. The stress solution calculation in arbitrary point of stabile rock stand Uniform distribution lateral resistance on the basis of Mindlin stress solution to give ,and adopt the stress overlay principle to calculate stress of arbitrary point in stabile rock ,Moreover on the basis of modified layered-summation method to calculate the deformation of arbitrary point in steady rock; the deformation of inner bonding section to be calculated on the basis of ordinary load translate method .Finally through pre-stress group anchor in every anchor asks the inner bonding section loads and deformation between the adjacent to rock mass of position harmonization relationship to establish the simultaneous equations series , Moreover adopt the iteration resolution, establish the relevant iterate standard , Thereby the problem be able to be finally obtained .Based on the effect factors of pre-stress loss of pre-stressed anchor rope in long time loading, to study the relaxation model of steel strand rheological model of rock settlement of foundation according to modified layered summation method as well as creep damage model of grouted material respectively, and used these theory to predict the stress loss of pre-stressed anchor rope. There are the significant sense to design and manage to pre-stressed anchor rope.The fiber grouted material can improve by a wide margin the tensile strength shear strength as well as tou...