... Abstract The paper describes the investigation results on specific strain energy in hard rocks (urtite, ijolite and apatite-nepheline ore) under uniaxial compression, tension and triaxial compression. The ways of strain energy accumulation have been shown in the investigated rock samples under...

..., is a function of mining dimensions, boundary conditions and the overburden characteristics, which can change the status of potential and strain energies inherent within the coal seam. Various researchers (Cook 1963, 1976, 1984, Peng 2008, Salamon 1984, Zhang et al. 2009) discussed the major sources of stress...

... are the kinetic energy release (W r ) from the excavation walls and the stored strain energy (U) in the rock around the excavation. According to Jaeger and Cook (1971) and later Salamon (1984), the sum of these two energy components makes up the change in potential energy (W), that is (equation...

... are determined. The influence of angles between foliations and loading directions, and possible mechanism are discussed. Wellbore Design variation reservoir geomechanics ultrasonic velocity compressive test peak strength loading direction Upstream Oil & Gas strain energy specimen takkiri...

... Abstract Some limitations of the models of limit equilibrium of forces for rock mass joints are discussed here, especially the exclusive use of dimensionless geometric parameters of roughness. A new limit equilibrium model of strain energies for rock joints, which allows the integration...

... [LMT 2]. Consequently linear parameters are transformed in dimensionless variables, like roughness slope and there is a lack of information in these models. A new original limit equilibrium model of strain energies that integrates linear parameters as roughness amplitude is introduced. It solves most...

... Modulus, = Poisson s ratio, c = uniaxial compressive strength, W = strain energy, cum APK = cumulative AE peak amplitudes. sample CS 13 T3.02 RS 11 [g/cm3] 2.2 2.5 2.6 Vp[km/h] 2.6 4.4 4.4 E[GPa] 7.3 30.0 34.5 0.37 0.26 0.21 c[MPa] 35 170 195 W [kJ/m3] 89 537 613 cum APK[dB] 127986 180600 76347...

... a large cavern and its numerical analysis were carried out, and then, the relationship between AE parameters, stress change, and fracturing is investigated. Acoustic Emission (AE) is a transient elastic wave, which is generated by the rapid release of strain energy within a solid material. In this study...