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SOME PECULIARITIES OF INTERACTION OF SOCKETED SHAFTS WITH ROCK MASS SUBJECTED TO LATERAL LOADING

Michail Zertsalov, Vladimir Znamenskiy, I.N. Khokhlov

Abstract

The article observes the results of numerical simulation of the interaction of socketed shafts with rocks under the action of horizontal loads. The study revealed the following features of deformation and failure of the system "shaftпїЅ rock mass". Analysis of the obtained results confirmed the conclusion previously made by other researchers that the curve of deformation of the socketed shaft may be approximated by bi-linear dependence, in which the inflection point corresponds to the end of the linear section of the curve of deformation of the shaft and the end of the curve пїЅ to the loss of socketed shaft bearing capacity. Studies have also shown that the type of the shaft behavior in rocks under the action of horizontal load largely depends on its length. Taking this fact into consideration, the definitions of "short" and "long" socketed shafts were taken. By "short" one means those shafts, which bearing capacity is defined by capacity related to rock and reinforced concrete. Bearing capacity of пїЅlongпїЅ shaft is determined by structural capacity of the shaft itself. For definition of the type of shaft behavior corresponding regression equations were obtained. In this equations as the response function was taken the ratio of length to diameter of the shaft, and as independent factors - the ratio of the modulus of elasticity of concrete to the modulus of elasticity of intact rock and RQD. In the analysis of the behavior of the пїЅlongпїЅ shaft it is necessary to know the length of its socket where displacements of the shaft are equal to zero and below which in the body of the shaft internal forces do not exist. To determine this specified socket length it also obtained the corresponding regression equation. Taking into account the sizes of the regression equations, for practical use, nomograms were constructed.

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