Abstract: Based on the overall loading characteristics, this study was to propose an integrated deformation modulus for representing the integrated loading and deformation effect of the layered rock mass. The analysis of engineering cases was conducted to establish a theoretical model, which reflected the anisotropic characteristics of the integrated deformation modulus of the hard and soft layered rock mass. The theoretical solutions of integrated deformation modulus of hard and soft layered rock mass were separately deduced by using the plastic mechanics under the parallel, vertical and arbitrary directions of the stress to the bedding planes. The consistency of the theoretical solutions was also verified. We deduced the theoretical description of the integrated Poisson's ratio of the parallel direction of stress to bedding planes and the integrated shear modulus of the vertical direction of shear stress to bedding planes. The integrated deformation modulus was obtained by the geological model testing the hard and soft layered rock mass of the dip angles at 0o, 30o, 60o and 90o. The differences in the results from the laboratory test and the integrated deformation modulus were from 4.20 to 8.77%; therefore, the theoretical equation achieved great effects. This research studied the influence of engineering load direction on the deformation properties of layered rock mass by using theoretical analysis and laboratory tests, and improved the theory and technical methods for studying the mechanical parameters of the existing layered rock mass.

Key words: layered rock mass, practice building load, theoretical model, integrated deformation modulus