factor for the granite was less than 1; for the basalt, 1.35; for the limestone, 1.52; and for the tuff, 1.7^* The compressional wave velocity of rock is affected by in creases in both …

The results show that the presence of water can significantly increase the drilling depth, and a laser irradiation of 1250 W can penetrate 56.5 mm deep into the rock in 30 s. The uniaxial compressive strength of basalt was reduced by a maximum of 38.23 % and the modulus of elasticity by a maximum of 74.99 % after the laser irradiation.

Corresponding values for a basaltic rock mass that incorporate the weakening effects of scale are deformation modulus, 10-40GPa; Poisson's ratio, 0.3; tensile strength, -0.1to …

Brown failure criterion for jointed rock masses is defined by: (1) where and are the maximum and minimum effective principal stresses at failure, is the value of the Hoek …

Compressive test results showed basalt fiber could increase compressive strength at elevated temperatures. The optimal basalt fiber volume fraction was 0.8%, whereby compressive strength was higher than that of control PVA-ECC by 62.05%, 55.45% and 37.24% at 400 °C, 600 °C, and 800 °C.

BFRP is composite material that usually contains high-strength basalt, aramid or carbon fibres on polymeric matrix (e.g. thermosetting resins). ... The molten rock is squeezed by small nozzles to form continuous strands of basalt fibres 13–20 m in diameter. ... Figure showed that the maximum compressive force values for BFRP …

Test results indicate that the treatment has negative effect on the rock P-wave velocity and dynamic tensile strength, and high power and low time radiation can cause more damage than the specimens treated at low power and long time radiation, though equivalent microwave energy is exerted on the basalt samples. For example, the …

Tumadhir and Borhan carried out the compressive strength of concrete inclusion with different dosages of basalt fibre from 0.1 to 0.5%. By an increment in the dosages of basalt fibre, the …

Uniaxial compressive strength ( c) and deformation modulus of rocks Average values from tests of intact rock samples ... Basalt 145 50 347 25 207 82 395 3 (17) Diabase, dolerite 229 88 384 13 152 81 537 5 15.2 Hyperite - - - - 245 108 441 2 ure Graywacke 81 25 310 12 - - - - ...

Typical values of strength parameters for intact basalt at ambient temperature (20°C) and negligible confining pressure are Young's modulus, 78±19 GPa; Poisson's ratio, …

Assessing the uniaxial compressive strength and tangent Young's modulus of basalt rock using the Leeb rebound hardness test. September 2020. Materiales de Construcción 70 …

For basalt rocks, Malik et al.12 investigated Deccan basalt rock and found the dynamic compressive strength between about 170 MPa and 260 MPa at a strain rate of about 400/s to 1600/s. Lindholm et al.13 found a much lower dynamic strength of about 110 MPa to 125 MPa at a strain rate of about 600/s and 1100/s for Dresser basalt rock.

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 …

Basalt is an extrusive igneous rock derived from Lava and spread over different localities in Jordan. It can be used in industrial applications, and as construction materials. Before using basalt, it is essential to determine its dry density, porosity, uniaxial compressive strength, and Brazilian tensile strength. The testing procedure and …

The uniaxial compressive strength (UCS) is classified as one of the basic m echanical properties of rocks, which is. widely used in mining and construction practice. For exam ple, it allows ...

If the upper part of the rock, within a depth of about 5/4, is of lower quality, the value of this part should be used. Another practice that is normally followed is to base the allowable pressure on the unconfined compressive strength, qu, of the rock obtained in a laboratory on a rock sample. A factor of safety of 5 to 8 is used on qu to ...

PDF | On Feb 3, 2017, P.M Diaz published Rock Mechanical Properties of Granite/ Clay/ Basalts/ Argillite / Glass and its Alterations at Different Temperatures-A Review | Find, read and cite all ...

Uniaxial compressive strength ( c) and deformation modulus of rocks Average values from tests of intact rock samples ... Basalt 145 50 347 25 207 82 395 3 (17) Diabase, …

The test results show that Kalgoorlie basalt rock exhibits high sensitivity to strain rate effect on its compressive strength especially above 100/s and dynamic increment factor up to 2.3 at ...

Uniaxial compressive strength (UCS) of rock is an essential parameter in geotechnical engineering. Point load strength (PLS), P-wave velocity, and Schmidt hammer rebound number (SH) are more easily obtained than UCS and are extensively applied for the indirect estimation of UCS. ... Andesite (1), Basalt (6), Deformed granite …

highest compressive strength value of 28.331 kgf/mm2 was obtained from the various parameters of 270 mesh-20% polyester- 1/20 catalyst and 270 mesh-25% polyester-1/30 catalyst.

The rock hardness of basalt is 6 on the Mohs scale, and can be seen through a combination of its compressive strength: 100-300 Mpa (Megapascal), its tensile strength: 10-30 Mpa, and its shear strength: 20-60 Mpa, which denotes that depending on the mineral makeup, basalt rocks fall in the strong – very strong category.

compressive strength of intact rock, the allowable pressure is taken as the uniaxial compressive strength. This correlation should be considered only as a first crude step in design (Peck 1976). 2. Strength of rock cores. A method for the assessment of the allowable bearing pressure is proposed by the Canadian Foundation Engineering

The uniaxial compressive strength of a rock under static loading often decreases with an increasing temperature at which the rock has been heat-treated before strength testing. This conclusion is drawn from a great number of experiments [1,2,4,8,9,11,17–19].The higher the temperature is, the lower the strength. Some results for uniaxial …

The optimal basalt fiber volume fraction was 0.8%, whereby compressive strength was higher than that of control PVA-ECC by 62.05%, 55.45% and 37.24% at …

Knowing the rock type and rock material hardness, it is possible for the experienced engineer or engineering geologist to make fairly accurate estimates on rock material strength. These can be readily verified by uniaxial compressive strength or point load tests. A simple estimate can be made from the field test in Table 5.

Compared with the compressive strength 250 MPa of basalt at 25℃, the compressive strength σ c after heat treatment at 200 ℃ and 400 ℃ increases by 10.50% and 15.85%, respectively. The main reason is that the expansion of mineral particles causes the gradual closure of primary fractures, which increases the compactness of …

The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain …

Basalt was used as an ornamental stone in any historic and ancient cities in Jordan. Measuring the uniaxial compressive strength (UCS) and the tangent Young's modulus (Et) in the laboratory requires premium quality specimens with special core dimensions.