... deformation hydraulic fracture fracture initiation matrix shrinkage linear elastic fracture mechanic geothermal reservoir study 15th ISRM Congress 2023 & 72nd Geomechanics Colloquium. Schubert & Kluckner (eds.) © ÖGG Study on the fracture propagation in geothermal during the hydraulic fracturing...

... laboratory, and the maximum volumetric shrinkage in each rock type is compared with its first- and second-peak radius of pore size distribution from mercury intrusion porosimetry, which represents pore structure, so that a maximum volumetric shrinkage of a rock can be estimated by a simple method...

... on strength, stiffness, chemical shrinkage as well as microcracking and creep are accounted for. For the description of the mechanical behavior of the ground, a multi-surface plasticity model is employed. The performed analyses of the excavation process provide insight into the influence of each phenomenon...

... permeability partial pressure equation shrinkage ABSTRACT: A technique to measure the two most important parameters controlling gas flow in coal - diffusion coefficient and permeability - using the transient approach is discussed. Diffusion coefficient is measured by applying the principle...

... investigated in progress of excavation considering direct damage zone of rocks due to blasting and dependency of rock properties on ground-pressure. Stresses in reinforcement in concrete lining increase due to creep and shrinkage of concrete material. Availability of the proposed visco-elastic or plastic...