Workshop in geomechanics

elective courses

The student should have basic knowledge in:

- analysis of the stress and deformation states

- classification of rocks and rock massifs

- phases of pre-critical and post-critical deformations in the deformation process

- determining basic geomechanical parameters: resistance to uni-axial and tri-axial compression and stretching, Young’s modulus and Poisson coefficient.

The classes allow you to familiarize yourself with selected methods of testing the geomechanical properties of rocks by performing measurements and laboratory tests and selected field tests along with the interpretation of the results.

As part of the classes, students independently perform on individually assigned rock samples:

- geometrical measurements of test samples to determine the basic parameters of physical properties,

- ultrasonic measurements of rock elasticity parameters,

- laboratory tests: uniaxial compression and stretching (Brazilian method).

The course also provides information on:

- methods of interpreting the results of geomechanical tests,

- ultrasonic testing of elasticity parameters,

- laboratory tests: uniaxial and triaxial compression, tensile, fracture toughness index KIc.

The workshop topics include:

1. Self-set basic parameters Basic determinations of physical properties (6 hours)

- geometric measurements of test samples,

- air-dry mass determination, after hydration and after freezing cycles,

- determination of bulk density, water absorption and porosity,

- statistical analysis of parameters and selection of appropriate research groups of samples.

2. Self-made measurements of ultrasonic non-destructive experiments:

- research methods and measurement of longitudinal wave velocity in several directions. (6 hours)

- interpretation of the results. (2 hours.)

- statistical analysis of variability. (1 hour)

- evaluation of the anisotropy of rock material. (1 hour)

3. Construction, operation conditions and research possibilities of the rigid press MTS-815 (2 hours):

-- configuration of press MTS for studies of resistance to uniaxial and triaxial compression, standards and experiment procedures, experiment process and interpretation of the obtained results.

4. Configuration of press Controls for resistance studies and self-made tests of to uniaxial compression and Brazilian method tensile strength, standards and experiment procedures, experiment process and interpretation of the obtained results. (6 hours).

5. Experiments of mechanical and physical properties of aggregates - Los Angeles method. (2 hours).

6. Preparation of reports on the performed tests. (2 hours.)

KIDYBIŃSKI, A. 1982. Podstawy geomechaniki kopalnianej. Wydawnictwo Śląsk; Katowice.

PINIŃSKA, J. 1999. Właściwości wytrzymałościowe i odkształceniowe skał, 5. Katalog Zakładu Geomechaniki IHiGI Wydziału Geologii Uniwersytetu Warszawskiego. Wydawnictwo Naukowe INVIT; Warszawa.

On completion of the course, the student:

- demonstrates deepened knowledge on the research procedures of ultrasonic methods and resistance experiments (P2A_W03),

- applies advanced techniques and research tools in resistance experiments in a uniaxial stress field (P2A_U01),

- conducts ultrasonic experiments (P2A_U04),

- applies informatics techniques to determine static and dynamic elasticity constants (P2A_U05),

- interprets resistance parameters obtained from tests in a uniaxial and triaxial stress field (P2A_U06),

- understands the need to broaden knowledge and competence in geomechanical studies (P2A_K01).

Continuous assessment; the performed tests reports