Role of MgO and Its Different Minerals on Properties of ...

pyroxenite, olivine and dunite contain a significant per-centage of SiO 2 (38–53 %) [1] ... They found compressive strength to be more than 2689 N with low RDI (10 %) and swelling


Uniaxial compressive strength and point load strength of ...

 · Using these assumptions, the tensile strength of rocks can be estimated by (2) and (3) in terms of D, L, P and v. Our next step is to relate the tensile strength and the uniaxial compressive strength of the solid. We further assume here that there exists a fixed ratio between the tensile strength and the uniaxial compressive strength of rocks.


(PDF) The Uniaxial Compressive Strength of Soft …

 · Soft rock is a term that usually refers to a rock material with a uniaxial compressive strength (UCS) less than 20 MPa. This low strength range might be influenced by physical characteristics ...


An Alternative Brittle Failure Criterion and Methodology ...

 · c. Uniaxial Compressive Strength=227MPa d. Tensile strength σt=7MPa (Estimate). Data sets for different rock types were analysed in the same manner with the results shown in Figure 3. Results obtained from laboratory data for various rock types by the above methodology are given in Table 1. (The curves are the result of using one value


v116n3a5 Rock Strength and Geometallurgical Modelling ...

compressive strength (UCS) (Akram and Bakar, 2007). The relationship of lithology, texture, and grain size with UCS revealed an ... pyroxenite and pyroxenite) are dominated by a cumulate


A Geometallurgical Approach at Anglo American …

correlated drop weight tests (DWT) to uniaxial compressive strength tests (UCS) and showed a decrease in DWT from pyroxenite through feldspathic pyroxenite to parapyroxenite.


UG2 pillar strength: Verification of the PlatMine formula

 · compressive strength (UCS) of the pillar material (Malan and Napier, 2011). [1] ... was the abrupt parting between the pyroxenite and leuconorite about 3 m above the hangingwall (Figure 7), as this interface is often the location of parting in the bords. This parting plane


COMPRESSIVE STRENGTH OF CONCRETE

 · The measured compressive strength of the cubes shall be calculated by divid ing the maximum load applied to the cubes during the test by the cross-sectional area, calculated from the mean dimensions of the section and shall be expressed to the nearest 0.5 N/mm2. In determining the compressive strength, do


ROCK STRENGTH DOMAINING AT MOGALAKWENA …

 · converted to uniaxial compressive strength (UCS). The relationship between lithology, texture, grain size and UCS was examined. There is an inverse relationship between UCS and grain size for unaltered rocks while altered rocks ... Figure 13: Replicating difference in UCS between pyroxenite and other rocks (Ziemski et al., 2010) ...


REGOLITH MATERIALS Sheila A. Thibeault - NASA

 · 985 Regolith Materials Sheila A. Thibeault1, Richard L. Kiefer2, Myung-Hee Y. Kim2, Janet L. Chapman2, J. Adam Weakley2, and D. Ryan McGlothlin2 1NASA Langley Research Center, Hampton, VA 2College of William and Mary, Williamsburg, VA 2003 National Educators' Workshop Hampton and Newport News, VA October 19 - 22, 2003


Compressive Strength - an overview | ScienceDirect Topics

Compressive strength data was obtained according to EN 1015-11 standard. The fresh mortar was cast and allowed to set at room temperature for 24 hours before being removed from the molds and kept at room temperature (20°C) until being tested. Compressive strength for each mortar mixture was obtained from an average of three specimens.


Mechanical properties of Finnish rocks based on uniaxial ...

 · ABSTRA Aalto-yliopisto, PL 12100, 00076 AALTO CT OF THE MASTER'S THESIS Author Alexei Kesonen Title of thesis Mechanical properties of Finnish rocks based on uniaxial compressive strength and tensile strength tests Degree programme Structural Engineering and Building Technology Major Foundation and Rock Engineering Code IA3028 …


The determination of uniaxial compressive strength from ...

 · Uniaxial compressive strength tests were conducted on trimmed core samples, which had a diameter of 38 mm and a length-to-diameter ratio of 2.0–2.5 . The tests were conducted on both oven-dried and saturated samples. The stress …


Compressive strength vs tensile strength | Stress …

Tensile strength is ability of material with resist or withstand against tensile load acting on both face along rising length by stretch or elongate prior to failure or crack. It is Resistance of material against using pulling force in equal and …


Concrete Compressive Strength | Kaggle

 · Concrete is a material with high strength in compression, but low strength in tension. That is why engineers use reinforced concrete (usually with steel rebars) to build structures. Content. Given are the variable name, variable type, the measurement unit, and a brief description. The concrete compressive strength is the regression problem.


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 · (compressive strength)σbc,。,,。 …


Mining by rock cutting in narrow reefs

 · Union Section, it had a low uniaxial compressive strength of 26 MPa; the sample also contained waste bands of pyroxenite with a UCS of 110 MPa. However, the Cherchar abrasivity index for the chromite ore was 5.4. This is an indication of the extreme abrasivity of the UG2 reef, on a par with high quality quartzite.


APPENDIX 1 - University of the Witwatersrand

 · Compressive Strength (UCS) test. The UCS (σ c) of the intact rock is used in rock mass classification schemes (section 3.7), and as a basic parameter in the rock mass strength criterion. These tests are usually done on cylindrical samples (Jager and Ryder, 1999). It is used to determine the unconfined compressive strength (σ c


(PDF) Geotechnical applications in open pit …

A highly sheared zone of pyroxenite up to 5 m in width and dipping at 45 separates the barren hanging wall norites from the pyroxenite ore body. The zone has a rock quality designation (RQD) less than 5% and a uniaxial compressive …


Compressive Strength of Concrete -Test procedure - CIVIL ...

 · The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall." Number of samples for testing Compressive Strength


Relationship between rock uniaxial compressive strength ...

 · The rock uniaxial compressive strength (UCS) is the basic parameter for support designs in underground engineering. In particular, the rock UCS should be obtained rapidly for underground engineering with complex geological conditions, such as soft rock, fracture areas, and high stress, to adjust the excavation and support plan and ensure construction safety. To …


MEMORANDUM Certificate in Rock Mechanics: Paper 1 …

 · Pyroxenite: k = 126MPa (RMRxUCS) 4.5 UCS=Unconfined uni-axial compressive strength where the sample is void of any weakness planes -By using and adapting the RMR ratings, the quality of the rock mass is also catered for. The impact of joints & bedding on rock mass strength is now included.


Karelian stone catalog and photo. Russian granite products ...

 · Type of rock: green pyroxenite Description: dark green-black color, coarse-grained structure, massive porphyry texture. Physical and mechanical properties: bulk density, 3120 kg/m3; water absorption,% 0,17; Compressive strength, 58-201 MPa; Durability, g / cm2 0,24; Radioactivity 10 bec/kg.


Standard Test Method for Compressive Properties of …

 · 3.2.3 compressive strength—the maximum compressive stress (nominal) carried by a test specimen during a compres-sion test. It may or may not be the compressive stress (nominal) carried by the specimen at the moment of rupture. 3.2.4 compressive strength at failure (nominal)—the com-pressive stress (nominal) sustained at the moment of failure of


TOWARDS AN IMPROVED PILLAR DESIGN …

 · formula includes a parameter K, which is a downrated uniaxial compressive strength value of the rock, used to calculate the strength of a pillar. At Bathopele Mine, for the shallower areas ... grained feldspathic pyroxenite, which hosts …


Compression and Tension Strength of some common …

 · Related Topics . Material Properties - Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.; Related Documents . Brick Densities - Densities of common types of bricks.; Bricks - Quantity and Mortar Consumption - Estimate required quantities of bricks and mortar.; Concrete Properties - Properties of normal strength Portland cement …


Selecting support for new mine development – a case …

 · for the chromitite rocks. Uniaxial Compressive Strengths for the different rock types vary between 80MPa for chromitite to more than 160 MPa for the more brittle anorthosites. The lower strength rock types (chromitite, pegmatoidal pyroxenite) generally behave in a ductile manner when loaded, whereas the


Utilizing the strength conversion factor in the estimation ...

 · The strength conversion factor (k) is the ratio between the uniaxial compressive strength (UCS) and the point load index (PLI).It has been used to estimate the UCS from the PLI since the 1960s. Many researchers have investigated the relationship between UCS and PLI for various rock types of different geological origins, such as igneous, sedimentary, and …


Correlation between Uniaxial Compressive Strength and ...

 · uniaxial compressive strength from the results of the point load test. 4. Test Results and Discussion 4.1 Uniaxial Compressive Strength Test Results The mean values of uniaxial compressive strength of the tested rocks are listed in Table 2. The strength values range from a low of 9.16 MPa for Marl to a high of 101.08 MPa for


Compressive strength of rocks - PetroWiki

 · Estimating compressive strength. General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C 0).Lithology is commonly derived during log analysis, so m may be estimated (Table 1).What is needed still is an initial measure of rock strength provided by C 0. C 0 can be estimated from porosity or …