Researching Of Mechanical Property And Design Method On Anchorage Section Of Pressure-dispersive Anchor Cable

Nowadays, the application of pressure-dispersive anchor has been far-ranging ingeotechnical engineering, especially in the field of the reinforcement of soft rock andthe soil which has lower bearing capacity. But the research on the theory of it is nowstill not enough. As the mechanism of its action is extraordinarily complicated and theanchoring effect can be influenced by a number of factor, there is much problemurgently need to be solved or discussed and further research is needed on themechanism of pressure-dispersive anchor cable.In this paper, the study of the anchoring range of pressure-dispersive anchor ispracticed in the field test and then the study of the the anchoring performance is takenby the means of numeral simulation and theory analysis on the basis of the field test.And then according to the two forms of the distribution of the shear stress betweeninjecting cement paste and hole wall which are gotten by the numeral simulation.First, the current study situation of pre-stressed anchorage cable especiallypressure-dispersive anchor is summarized from the aspects of theoretical research, testand numeral simulation.Secondly, the structure and the mechanical characteristics of the pressure-dispersive anchor cable and the differences between the pressure-dispersive anchor andthe ordinary tensile type anchor cable are described in detail. And then it’s the field test,during which hollow inclusion strain gauges are settled in the rock around the anchorcable and the range of the stress influence of the pressure-dispersive anchor cable isgotten according to the numerical sensitivity of the strain gauges which are at differentradial and axial length.Then, Analysis of the numerical calculation is used of which the numerical modeland the parameters are conform to the actual situation. The rationality of the numericalmodel and the parameters is verified by comparing the results of the numericalcalculation and the field test. And the influence on the performance of anchorage areanalyzed under the multiple conditions such as the different arrangements of the bearingand the different grouting parameters.At last, the calculation formulas of the length and the maximum bearing capacityof the anchorage section of pressure-dispersive anchor cable.is given on the basis of the comprehensive review of the domestic and the foreign design methods of prestressedanchor cable and according to the two forms of the curve of the distribution of the shearstress between injecting cement paste and hole wall which are gotten by the numeralsimulation.