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Keywords: specimen
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Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-184
... Science 833 (2021) 012181 doi:10.1088/1755-1315/833/1/012181 where is the total stress tensor, is pore pressure and is the Kronecker delta. The Biot coefficient is defined in several ways. The most common is [4] 1 = 1 (2) where is the specimen bulk modulus in drained conditions obtained by changing...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-115
...: the specimens show lower stiffness and strength when the content is higher. Accordingly, the samples have been classified into two different types (A and B). The constitutive model reproduces well both the mechanically strong and stiff behaviour of Type A as well as the more ductile mechanical response of Type...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-165
... to suit the individual project. In the present research work, adhesives were investigated which are suitable for the fissure geometry of the specimens and which penetrate and wet the fissures without any problems. In addition to viscosity, the volume shrinkage of the adhesive itself is also decisive...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-166
..., as well as the sacrificial coating, i.e., hot-dip galvanising, methods were tested. Testing specimens were made by inserting loading pins between locked cable bolt king wires (coated) to simulate the in-situ stress condition. Cable bolt specimens were then fully immersed into a hydrogen sulphide solution...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-029
..., the preparation procedure, and in the choice of specimen size/mass. This manuscript reviews the adopted methodologies and highlights the advantages and drawbacks on the testing approaches used. Two of the institutions rely on a general approach which is standardized, and the results are compared...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-006
... direct shear test setup. The system normal stiffness was found to be about 11 300 kN/mm derived from normal loading up to 4.5 MN using a steel specimen. The direct shear testing performance under the CNS configuration was evaluated using the steel specimen, which had a joint with a known angle...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-035
... in the North Sea. Four specimens from Rurikfjellet and one specimen from Draupne were tested. Results of the tests shows that the peak friction coefficient for fractures in Rurikfjellet specimens varies between 0.26 and 0.29 while the residual friction coefficient ranges from 0.19 to 0.25. For Draupne shale...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-024
... are determined by vacuum absorption of water hydrostatic weighing. Six cubic specimens (edges measuring 50 mm) were taken [15]. In order to determine the real density and total porosity, a single specimen was chosen at random from the set of six. 2.3.2. Water absorption at atmospheric pressure. This property...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-005
... symmetry, properly oriented measurements allowed the estimate of the dynamic elasticity tensor. The closure of cracks was investigated by means of isotropic triaxial tests. Furthermore, static deformabilities measured under deviatoric stress on specimens with different angle of schistosity allowed...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-032
... (compressional and petrographic analysis) carried out on quartz-mica schist specimens taken from Central Otago in New Zealand, and is subsequently compared to international experimental studies on schist. The results show that the foliated fabric produces directionally dependent strength anisotropy which shifts...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-004
... granitic blocks tested against toppling in the tilt testing table including specimen, dimensions, tilting angle physically observed, analytically computed, and numerically estimated, and finally factor of safety against toppling in the moment of the observed toppling. Specimen 1 2 3 4 Material White...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-027
... doi:10.1088/1755-1315/833/1/012032 Before testing stacks of rock samples equipped with proppants, the limestone was geomechanically characterized. Blocks and prepared specimens showed no signs of anisotropy or heterogeneity. The specimens were prepared from a total of six blocks by drilling...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-015
... testing of physical properties of rock specimens from excavation damaged rock mass. Laboratory testing was conducted on drill core specimens extracted from the excavated surface of a tunnel located at approximately 345 m depth in Olkiluoto, Finland. A total of 141 drill core specimens of three main rock...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-028
... specimen, which we call pseudo-SCB (pSCB). To compute KIC in this configuration we have derived the corresponding dimensionless stress intensity factor function (Y ) based on the finite element method. The results show that the pSCB test provides with consistent values of KIC and it also allows to control...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-017
... geologist europe government geological subdiscipline environmental science 833 geology fracture health & medicine perpendicular propagation mineral specimen rock engineering orientation characteristic hydraulic fracturing reservoir geomechanics practice iop publishing iop...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-010
... a controlling role on the peak shear strength [4]. Past and present in-situ and laboratory fracture shear experiments, with a few exceptions, are either conducted on small specimens (up to 200 mm) or on larger specimens at low normal stresses (up to 1 2 MPa). To date, limited investigations have been conducted...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-067
... temperatures respectively of 50 and 90°C) and thermo-chemical treatment. Thermo-chemical treatments were performed by soaking the specimens in a 5x10 −6 mol/l solution of sulphuric acid at pH=5 to simulate the acid rain behavior, at constant target temperatures, for one week. In general, for each weathering...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-030
... study focuses on the thermal behavior and characteristics of intact rocks and thermally exposed specimens. Cylindrical specimens were heated to 250°C, and 500°C in an electric oven in laboratory conditions. Physical properties (density, ultrasonic pulse velocity) and nondestructive strength tests...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-018
... criteria (i.e. Hoek-Brown) evolution with specimen size. This obvious lack of data can be attributed to the difficulties of having available Hoek’s cell of different sizes. With the aim of filling this void, the authors have carried out sets of around 25 stress-strain triaxial tests on intact 30, 38, 54...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-026
... configuration based on the previous two that we have called pseudo-SCB (pSCB) test. To perform the photoelastic analysis, all the experiments were complemented with a specially-designed experimental setup consisting in two orthogonally arranged circular polarizers placed on both sides of the tested specimens...

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