... of the energy released by crack debonding, the energy dissipated by crack opening, and the elastic strain energy stored in the bulk outside of the damage zone. In CZM and XFEM, the overall stiffness of the rock mass in the process zone drops as soon as the fracture starts propagating (unstable fracture...

... of elastic and elastic-plastic, under the action of tectonic movement and self-weight body force, aside from plastic deformation, strain energy is mainly stored in geology body. Recently, energy dissipation and energy release in the processes of deformation, failure of rock mass, and earthquake have been...

... modulus varies from 15 to 25 GPa, and the Poisson s ratio from 0.23 to 0.43. The elastic parameters tend to be independent of the confining pressures. The distortional strain energy at dilation and at failure from various loading rates varies linearly with the mean strain energy. The proposed empirical...

... stress along the tunnel axis, and c is the uniaxial compressive strength of rock material. 1435 1.3 Kidybinski method from Poland Mainly based on the test results of coal, Kidybinski proposed an elastic energy (strain energy) index Wet as rockburst crite- ria where Wet stands for a ratio of elastic...

... metals & mining resistance steel roadway support Proc strain energy computer rockburst underground rockburst loading capacity strengthening construction czech mining authority Ostrava dynamic effect boundary condition longwall gate support ABSTRACT Maximum effects...

... ABSTRACT: This paper describes a 3-Dimensional finite element (FE) modelling approach which leads to the computation of seismic energy release rate (ERR) and strain energy storage rate (ESR) which result from mining. The concept of critical strain energy is introduced as a means to help...

..., but the effective calculating model suitable for the jointed rockmass supported with bolts and cables is still absent at present. Hence, it is necessary to establish a model for analyzing the deformation and stability of this kind of rockmass. Based on the hypothesis of equivalent strain energy and analysis...

... metals & mining fault-slip burst expression Reservoir Characterization convergence excavation Upstream Oil & Gas potential energy rock mass strain energy seismic magnitude seismic energy release seismic relationship aftershock area energy consideration equation rockburst...

... ABSTRACT: The strain energy release procedure in rock mass induced by the change of stress state is studied in this paper. The stable condition of rock is put forward, that is, the actual strain energy is smaller then or equal to the maximum retainable energy. Based on this condition...

... the excavation some energy becomes available to do some work. The sources of this energy are the potential energy change, W" and the strain energy content of the rock which was removed in the course of enlarging the excavations, Um. Thus the total energy available is Wt + Um. In the process of enlarging...

... Summary In order to study the mechanism of failure of jointed rock mass in situ, strains and displacements distributed on a side surface of cut-out rock blocks were measured. The total amount of strain energy was approximately computed from many measured strains at each step of applied...

.... The results show that the start of crack propagation is only influenced by statistical effects, that the range of stable crack propagation seems to be independent of size, and that the range of unstable crack propagation is affected by stored strain energy (which is a function of specimen size...