Numerical simulation of rock dilatancy effect

The shear zone distribution and strength characteristic of rock specimen under different dilatancy angle and confining pressure are studied using numerical simulation software flac3D.The results show that: the rock specimen under uniaxial compression tests changes from single shear failure to conjugate shear failure and the toughness increases at the same time as the dilatancy angle increases.The increasing of confining pressure makes the zero dilatancy angle rock specimen develope from single shear failure to double X shape shear failure and the nonzero dilatancy angle rock specimen develope from composite conjugate shear failure to single X shape shear failure and also the shear zone width increase.The shear zone angle of the rock specimen increases as the dilatancy angle increases and decreases as the confining pressure increases.Confining pressure makes the peak intensity,especially the residual stress of the rock specimen increase.The intensity of the rock specimen increases as the dilatancy angle increases,however,with little amplitude.The deformation of the roadway surrounding rock increases as the dilatancy effect increases,the reasonable and efficient controlling of the roadway dilatation deformation is a key support technology.