Shear jointed rock mass

Practically, r(xk masses are in compression and shear state because of the in situ stresses. The unloading of the rock nnasses near excavated slopes causes tension-shear stress state in part of the slopes. Consequently, it is necessary to set up constitutive model of jointed rock masses considering both compression-shear and tension-shear mechanisms. 

A A constitutive model of the Jointed rock masses under compression and shear... 

According to the principle of self-consistency (Kemeny, 1986), the compliance tensor of a jointed rock mass under tension and shear stress state can be deduced as... 

Damage evolution equation of Jointed rock mass under tension and shear... 

The shear strength of a rock mass and its deformability are influenced very much by the discontinuity pattern, its geometry and how well it is developed. Observation of discontinuity spacing, whether in a field exposure or in a core stick, aids appraisal of rock mass structure. In sedimentary rocks, bedding planes are usually the dominant discontinuities, and the rock mass can be described as shown in Table 2.1. The same boundaries can be used to describe the spacing of joints (Anon, 1977a). 

The degree of alteration or filling of the most unfavourable joint set, J. The roughness and degree of alteration of the joint walls or filling materials provide an approximation of the shear strength of the rock mass. 

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