... stress is considered in the calculation of the stresses and displacements of the structure. It should be noted that the initial stress is Cauchy stress consisting of a surface traction vector, while the gravitational force is a body force acting on the mass of the materials. This computational approach...

... between 218m and 220m in depths during excavation of a 6.5m diameter access shaft and the results were analyzed using a three-dimensional numerical model. As a result, it was found that the maximum and minimum stresses occurred in the direction of horizontal minimum and maximum initial stresses...

... and radial displacement around a circular tunnel excavated in strain-softening Mohr-Coulomb rock masses is introduced. By assuming the initial stress is isotropic in the plane normal to the tunnel axis, the formulation is given on the plane strain condition. The finite difference approximation was carried...

... determination well logging convergence application reservoir geomechanics displacement roof settlement expression Reservoir Characterization Artificial Intelligence coefficient excavation rock mass tunnel numerical solution initial stress diagonal convergence Horizontal convergence circular...

... of core disking was observed during overcoring. The selecting method of strain data uninfluenced by the core disking was proposed, using X-ray CT scanner. Then, the state of induced stress determined from the selected strain data was discussed, comparing with the state of initial stress. Eine Serie von...

.... FOTIEVA & A.SAMMAL, Tula State University, Russia , ' "1 1 ABSTRACT: The method of determining the characteristics of initial stresses in an intact rock mass caused by the action of gra- vitational or tectonic forces on the base of back analysis of full-scale measurements results concerning the rock...

... to be larger than the calculated ones. This may be due to underestimation of anisotropic intensity I.. as well as to the lack of consideration for both two predominant joint sets (K, and K1). Further studies are, therefore, required in this respect. 4. PRIORITY, JOINT ANISOTROPY OR INITIAL STRESS? Jf 1...

... tensile strength stress distribution initial stress Simulation vein tensile stress horizontal component Panasqueira , 1 Geomechanics inve.~tigatiors in a multiple room and pillar mine Investigations geomecaniques dans une mine a chambres et piliers multiples Geomechanische Untersuchungen...

... metals & mining hemispherical-ended borehole technique Rock stress stress measurement major gold vein reservoir geomechanics stress determination gauge rock temperature initial stress hot rock coefficient Reservoir Characterization initial rock temperature thermal expansion...

... the tunnel wall, so that the maximum principal stress near the tunnel wall acts almost vertically. On the other hand, the stresses in the region more than 10m deep from the wall are considered to be corresponding to the initial stress in this field, because the distance from the tunnel wall is sufficient...

... Upstream Oil & Gas back analysis quantitative evaluation construction Artificial Intelligence support structure rock bolt strain distribution optimization problem allowable value design variable support measure displacement shear strain normalized initial stress field...

... intersection intersection excavation initial stress ABSTRACT: A circular shaft intersected by two horizontal arched tunnels is analyzed using a three-dimensional elastic-plastic finite element code. The stress concentration around the shaft-tunnel-tunnel intersection is compared with the two...

... displacement strain-gage plug conical-shaped borehole strain-gage plug initial stress reservoir geomechanics diameter underground powerhouse Kobayashi Upstream Oil & Gas conversion matrix Poisson conical-shaped strain-gage plug Reservoir Characterization borehole boundary...

...: 1)Generation of initial stresses, 2)Excavation of a quarry in the lower pan of the slope. 3) Effect "Of correcting measures adopted. Local and global Safety Factors and Safety Margins have been computed and compared with values based on conventional limit Equilibrium methods. RESUME: La...

... einen grubenbau contact problem Interlace action ot cross-section outline correspondence distinguant par leur caracteristique initial stress correspondingly Equality boundary condition ot Deformation Characteristic tormulae diameter different deformation characteristic border...

... and Poisson's ratio of ground materials and initial stresses existing in the ground prior to excavation can be determined from the measured displacements by means of back-analysis. When we know the material properties and initial stresses, it is possible to analyze the behaviour of main tunnels by using...

... and mitiga- tion of rook burst and gas burst hazards. New techniques for initial stress relief as large borehole method, injection of water, cover- ing with steel webs etc. c. Back-Analysis of Case records. D. High efficiency tunneling methods henthe size and share of tha orehody are known and t~le lod...

..., to the direction of uniform uni-directional initial pressure and parallel to the direction of uniform initial shear stress. The complete three-dimensional state of stresses and displacements for any state of initial stresses can be evaluated easily by super- posing the results obtained herein. R~SUME:Par l'emploi...

.... 2. Determination of stress functions The tunnel excavation can be expressed by releasing the initial stresses σijnj which exist on the virtual tunnel boundary B1(Fig.1) before the excavation, where nj are the components of the inward unit vector normal to B1. The initial stresses can be considered...

... SUMMARY: The stability of rock openings, especially those with wide spans, is largely determined by the state of initial stresses in the rock in combination with the joint properties. In order to produce correct designs and especially to be able to chose between sites of different suitability...