... coefficient. According to the results, the increase of unloading rate will intensify stress oscillation and increase additional dynamic stress disturbance of the joint rock mass near the tunnel boundary. As the vibration dissipates kinetic energy, the additional dynamic stress disturbance farther away from...

... to estimate properties for jointed rock masses, but in this paper, the approach is modified to obtain properties for breccias. The key parameters in estimating properties are the clast/matrix ratio, the distribution of clast sizes, and the relative strengths of clasts and matrix. Numerical models are used...

...; Asadizadeh et al. 2018b). metals & mining bridge angle response surface methodology upstream oil & gas experiment independent parameter reservoir characterization mechanism non-persistent joint loading direction jointed rock mass dynamic energy rock mass joint continuity factor...

... block strength Reservoir Characterization Engineering rock mass strength veined rock mass rock mass bewick tensile strength metals & mining strength rock strength jointed rock mass rock mass condition 1. INTRODUCTION Recent experience in copper porphyry rock masses at depths below...

... ABSTRACT ABSTRACT: In order to investigate the influence of joint geometric parameters on the mechanical behaviors of jointed rock masses, the compression shear test was carried out. The joint dip angle and joint overlap were varied to alter the relative positions of parallel joints...

... ABSTRACT: The strength and deformation characteristics of jointed rock masses before and after excavation were investigated using the discrete element method (DEM). A special loading path was adopted: firstly, the sample was subjected to anisotropic compression until the target stress level...

... ABSTRACT: Physical modelling of rock masses allows for direct observation of how joint structures affect the overall system. The feasibility of constructing an artificial jointed rock mass with discontinuous joints was examined for the ultimate purpose of representing jointed rock mass...

... network can be implemented without difficulty in estimating grout penetration in a jointed rock mass. For a verification of the established numerical analysis, the results of penetration length in 1-dimensional linear flow analysis was compared to previous analytical solution. We also showed...

... Abstract: We consider a jointed rock mass in which significant brittle fracturing is necessary between discontinuous joint segments for overall failure to occur. Simple methods to determine slope stability in such a rock mass rely on assumptions about the behavior of rock bridges. We use...

... jointed rock mass Mining Science mechanical behavior friction coefficient stress-strain curve shear stiffness stiffness micro crack international journal normal stiffness failure mechanism 1. INTRODUCTION The mechanical and geometric properties of joints are recognized as the key factors...

..., and the analysis results can be used to guide the construction of engineering. 1. INTRODUCTION Complex, jointed rock masses are commonly encountered in both underground excavation and slope stability engineering. The strength, deformation and time-dependent characteristics of rock masses directly affect...

... Abstract: In many cases, uniaxial compressive strength (UCS) for intact rock and rock quality designation (RQD) are the only information available for describing rock strength and discontinuities respectively; consequently, the design bearing capacity of jointed rock masses becomes...

... of the jointed rock mass having finite size fractures capturing the anisotropic effects arising from the fracture system. An REV size of about 25 m, which is about 8 times the mean fracture size of joint sets, was found to represent the mechanical properties of the rock mass. A number of relations are developed...

... propagates in an intact medium, it is attenuated simultaneously by material damping and geometrical spreading. However, when a shock wave propagates in a jointed rock mass, wave attenuation is controlled by the characteristics of joints surfaces, the rock wave impedance of both walls of each discontinuity...

..., J. 1998. A study of UDEC modeling for blast wave propagation in jointed rock masses. Int J Rock Mech Min Sci ;35(1):93 9. 7. Goodman, RE., Taylor, L., Brekke, TL. 1968. A model for the mechanics of jointed rock. J Soil Mech Found Div, ASCE;94(SM3):637 59. 8. Lei, WD. 2005. Numerical studies on 2-D...

... ABSTRACT: An assessment of mechanical behavior of jointed rock masses is an essential requirement in the site selection, design and successful execution of Civil and Mining Engineering projects. A quick estimate of these properties for preliminary evaluation of alternate sites will reduce...

...1. INTRODUCTION Intermittent joint cuts the rock material into intermittent jointed rock mass. This kind of rock mass is prevalent in nature. Actually, nearly all the rock engineering encounter intermittent jointed rock mass[1]. The new cracks initiate from the tip of existing joints and propagate...

... material and less than unity for in situ material. Hoek-Brown model gives ARMA 10-161 Equivalent continuum modeling for wave propagation in jointed rock masses Oleg Vorobiev and Tarabay Antoun LLNL, Livermore, CA, USA Copyright 2010 ARMA, American Rock Mechanics Association This paper was prepared...

... platform. At present, continuum mechanics is usually adopted for stability analysis of underground caverns, such as finite element method and finite difference method. A variety of numerical modeling methods have been developed for jointed rock masses in recent years, such as DEM and DDA, have been applied...

... bolt number experimental study Reservoir Characterization rock bolt powder Wellbore Design correlation curve peak strength rock mass loading direction rock material Upstream Oil & Gas test result jointed rock mass Shandong University barite powder perpendicular stress-strain...