In excavation tunnels with properties of inflatable sedimentary rocks, the change in floor height and movement of side walls inwards is often observed and causes tension and destruction of the structure. Stones that swell also exhibit viscoelastic behavior, possibly due to the sliding of clay layers. In order to determine the physical and mechanical parameters of shale, mudstone and sandstone which include tunnel No. 3 of the eastern tunnel of Parvadeh Tabas mine, special gravity tests, porosity, water absorption percentage, uniaxial compressive strength, Brazilian resistance test, swellability test, X-ray diffraction (XRD) test, and… Face. The relationship between the parameters of the intervening rock mechanics and the swelling of the rocks containing this tunnel has been paid. The tunnel is composed of fine-grained sandstone, shale and coal-juxtaposed mudstone. Cements are in the form of silica, lime and iron oxides which are important factors in the impact of the resistance of samples. Clay minerals are dominant in ilite and chlorite and to a lesser extent montmorionite and kaolinite. The inflation coefficient of the studied rocks including shale, mudstone and sandstone were predicted to be 23.64, 17.6 23 and 12.3 percent, respectively.