Determination of states of stress in hard rocks

2014 ◽  
pp. 891-896
Author(s):  
A Förster ◽  
Ch Lempp
Keyword(s):  
Hard Rocks

scholarly journals Development of a mathematical model for calculating the process of crushing hard rocks by explosions of cylindrical charges of explosives

2020 ◽  
Vol 5 ◽  
pp. 30-32
Author(s):  
Norov Yunus Dzhumaevich ◽  
Mehmonov Maksud Rabbonokul ugli
Keyword(s):  
Mathematical Model ◽  
Rock Mass ◽  
Mechanism Of Action ◽  
Mathematical Description ◽  
Granulometric Composition ◽  
Rock Fragmentation ◽  
Hard Rocks ◽  
Definition Of ◽  
The Relationship

The article presents a developed mathematical model for calculating the granulometric composition of the blasted rock mass based on the mechanism of action of an explosion in rocks, a mathematical description of the determination of natural units (blocks) in the rock mass, the relationship between the degree of rock fragmentation and the size of the units and the definition of sections of the controlled pressure zone.

Determination of the fracture toughness of a saturated soft rock

1990 ◽  
Vol 27 (3) ◽  
pp. 276-284 ◽  
Author(s):  
C. M. Haberfield ◽  
I. W. Johnston
Keyword(s):  
Fracture Toughness ◽  
Plane Strain ◽  
Loading Rate ◽  
Soft Rock ◽  
Plane Strain Fracture Toughness ◽  
Hard Rocks ◽  
Strain Fracture ◽  
Reasonable Range ◽  
Insight Into

Although the literature provides a reasonable range of information concerning the fracture toughness of relatively hard rocks, there is virtually no data for saturated soft rocks of uniaxial compressive strengths less than about 10 MPa. To gain some insight into the plane strain fracture toughness of such a soft rock for use in the numerical modelling of crack propagation during pressuremeter testing, a large number of laboratory tests were conducted. The material used in these tests was a synthetic soft rock that modelled soft mudstone rocks reasonably accurately. This paper describes the test techniques adopted and the results obtained. The variation of fracture toughness with loading rate and with size and shape of the test specimens is presented and discussed. On the basis of these results, guidelines are suggested for the determination of plane strain fracture toughness of a soft rock. Key words: fracture mechanics, fracture toughness, laboratory testing, soft rock, weak rock.

The determination of usability area for capacitive resistivity measurements

2020 ◽  
pp. 100-106
Author(s):  
A. I. Gruzdev ◽  
A. A. Bobachev ◽  
V. A. Shevnin
Keyword(s):  
Simple Model ◽  
Field Work ◽  
Frozen Ground ◽  
Galvanic Coupling ◽  
Resistivity Measurements ◽  
Hard Rocks ◽  
Resistivity Method ◽  
Engineered Structures ◽  
Fast Field

Resistivity method is widely used in shallow surface geophysics. Capacitive resistivity is one of techniques which help to extend usage of resistivity method for environmentc where galvanic coupling of electrodes is difficult, for instance, frozen ground, hard rocks and engineered structures (roads, railways and others). This technique allows fast field work without galvanic coupling electrodes. The main problem is complicated calculation of forward resistivity for simple model. In results, the limitations to the usage of the technique are not clear in theoretical and practical aspects. The authors determinate the limits of electrical properties and distances for capacity resistivity.

scholarly journals Determination of fracture storativity in hard rocks using high-pressure injection testing

1998 ◽  
Vol 34 (10) ◽  
pp. 2551-2560 ◽  
Author(s):  
Jonny Rutqvist ◽  
Jahan Noorishad ◽  
Chin-Fu Tsang ◽  
Ove Stephansson
Keyword(s):  
High Pressure ◽  
Hard Rocks ◽  
Pressure Injection ◽  
High Pressure Injection

Experimental determination of the energy of fracture in thermal fragmentation of hard rocks

1968 ◽  
Vol 4 (3) ◽  
pp. 314-315
Author(s):  
S. A. Goncharov ◽  
A. P. Dmitriev ◽  
L. S. Kuzyaev
Keyword(s):  
Experimental Determination ◽  
Thermal Fragmentation ◽  
Hard Rocks

Determination of Poisson’s ratio in crushed hard rocks of various grain-size composition

2017 ◽  
pp. 45-50
Author(s):  
V. M. Lizunkin ◽  
◽  
V. A. Babello ◽  
M. V. Lizunkin ◽  
A. V. Beydin ◽  
...  
Keyword(s):  
Grain Size ◽  
Poisson’S Ratio ◽  
Size Composition ◽  
Poisson's Ratio ◽  
Grain Size Composition ◽  
Hard Rocks

scholarly journals The determination of rockburst hazard degree of hard rocks by the test results under uniaxial compression

2019 ◽  
pp. 41-50
Author(s):  
Kozyrev Anatolii A. ◽  
◽  
Kuznetsov Nikolai N. ◽  
Fedotova Iuliia V. ◽  
Shokov Anatolii N. ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Test Results ◽  
Rockburst Hazard ◽  
Hard Rocks ◽  
Hazard Degree

scholarly journals NON-DESTRUCTIVE METHOD FOR RAPID "IN SITU" CHARACTERIZATION OF ROCKS

2004 ◽  
Vol 36 (4) ◽  
pp. 1912
Author(s):  
N. Ciornei ◽  
I. Facaoaru ◽  
V. Cetean
Keyword(s):  
Quality Criteria ◽  
In Situ Characterization ◽  
Hard Rocks ◽  
Determination Process ◽  
Building Activity ◽  
Non Destructive ◽  
Selection Of

The effective determination of the field and place of application of the products resulting from stone working is a compulsory requirement in the building activity and is solved by laboratory analyses. This article presents details on the determination, by non-destructive method, of the compression strength of the rocks, both "in situ" (in the deposit) and in a laboratory. The originality of the method consists in simplifying the determination process of this parameter, a method that is in agreement with the systems proposed to be applied in the European Community. The method has the advantage of being applicable in quarries, where knowledge of this parameter leads to a rationalizing of the working and more especially to a selection of the blocks by quality criteria. The method is applicable to all categories of natural consolidated hard rocks, being a viable alternative for deposits with an inhomogeneous composition as to quality and structure.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Sign in / Sign up

Export Citation Format

Share Document