Strength criterion of rock mass considering the damage and effect of joint dip angle

Abstract

It is highly significant to theoretically assess the effect, under load, of initial stress and structure on the mass damage of rock mass. In this reported study, first a multi-factor coupling damage constitutive model under the action of joint-load was established by fully considering the non-uniformity, anisotropy and initial structure of a rock mass based on the Weibull distribution and D-P criterion. The relationship between the damage evolution and joint angle in the rock mass was elaborated. Then, a jointed rock mass strength criterion was built in line with the D–P criterion and the limit state of rock mass failure by the method of multivariate function total differential as based on the constitutive model. The results showed that the established constitutive model was in good agreement with the test results, which accurately reflected the damage characteristics of jointed rock mass during the entire loading process. The initial damage value of the rock mass increased with increasing joint dip angles, and the damage evolution of the jointed rock mass could be divided into the initial, stable, accelerated and failure damage stages. Comparing the results of this approach with other methods it was found that the strength criterion better reflected the effects of minimum principal stress σ3, volume stress σm, shear stress J21/2 and joint dip angle β on rock mass strength than other existing strength criteria, which showed that the proposed method offered important guiding principles for the engineering practice.

Pressure-Shear Crack Initiation and Expansion Mechanism of Complex Cracked Rock Mass under the Seepage Stress

“…In order to have a better living ecological environment, the excavation of the project is basically based on the change of the stress field in the rock body, which will inevitably lead to changes in the regional or local underground water discharge environment of the rock mass. After the artificial disturbance of the low-water seepage field, the mechanical action strength and action form of the rock mass will change to a certain extent, and these uncertain changes will affect the stability of the fractured rock mass [5]. Fractured rock mass contains many macroscopic discontinuities, mainly including voids, microcracks, defects, and joints.…”

Failure characteristics of rocks with non-persistent joints under local load

“…The single jointed rock is classified into tensile failure through joint surface, shear failure along joint surface, tensile failure along joint surface, and complete material failure. The jointed rock damage occurs first at the joints and then throughout the rock [1][2][3][4][5][6][7]. The number of joints also has a significant effect on rock failure and mechanical properties, and the failure characteristics of multi-jointed rocks are more complex than those of single jointed rocks [8,9].…”

Adaptive approach formation using machine vision technology to determine the parameters of enrichment products deposition

“…The regression analysis of the data obtained made it possible to establish that for all samples in all experiments, the most appropriate Weibull model is the approximating model of this type [28][29][30][31]:…”