CLASSIFICATION // CHARACTERIZATION OF SOME …

Intact rock strength . The uniaxial compressive strength of a rock material constitutes the highest strength limit of the rock mass of which it forms a part. It is determined in accordance with the standard laboratory procedures. For the purpose of rock mass classification, the use of the well -known point load strength index can be useful as the

A modified particle contact model for matching the ratios of …

The Hertz-Mindlin with bonding (HMB) contact model in the commercial discrete element method (DEM) software EDEM is widely used to simulate and analyze the mechanical behavior of rocks. However, it cannot match the high ratios of uniaxial compressive strength (UCS) to tensile strength (TS) observed in brittle rocks like basalt. In this study, a modified …

Comparison and combination of Leeb hardness and point load strength …

Uniaxial compressive strength and tensile strength test. According to the recommended testing method by the International Society of Rock Mechanics (ISRM) (Bieniawski and Bernede 1979), the uniaxial compressive strength of the standard cylindrical specimens of rock was measured using a 60-ton microcomputer-controlled electronic universal material …

Performance of Basalt Fibre Reinforced High Density …

The compressive strength test was performed for 7 days and 28 days. The 7th day and 28th day compressive strength was maximum for an optimum 1% basalt fibre. The compressive strength of high density concrete increased with an increase in fibre dosage up to 1%, and further increase in dosage decreases the compressive strength.

The tensile strength of volcanic rocks: Experiments and …

The tensile strength of volcanic rocks is an important input parameter for volcano modelling (e.g., see discussion in Heap and Violay, 2021).For example, magma pressures must exceed the tensile strength of the host rock in order to propagate dykes to feed eruptions (e.g., Gudmundsson, 2006) and, therefore, the tensile strength of volcanic rocks is an important …

Assessment of the optimal level of basalt pozzolana …

Basalt is an igneous rock that developed during the cooling of magma during the earth's early eras. ... Maximum compressive strength of concrete was achieved by 15% replacement of cement by mixture of basalt at 56 days and 90 days curing. 5-

Strength and abrasive properties of andesite: relationships …

Aggregates are necessary materials for the construction industry. Owing to their favourable properties, andesites are frequently used rock materials; hence, the investigation of their mechanical and aggregate properties has great significance. This paper introduces the analyses of 13 Hungarian andesite lithotypes. The samples were collected from six andesite …

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES

Unconfined compression behavior of basalt …

Basalt fiber is a promising reinforcement agent for loess engineering. In this study, unconfined compressive tests facilitated with the digital image correlation (3D-DIC) method were carried out on basalt fiber–reinforced loess to obtain the deformation images and surface strain fields at different loading moments. The reinforcement mechanism of samples …

Limits on strength and deformation properties of jointed …

Values of the unconfined (or uniaxial) compressive strength 0-c range from < 100MPa to nearly 500MPa, with anaverage value of 266 + 98 MPa. Upper and lower values of364 and 168 MPa, …

Damage properties of basaltic rocks under multilevel stress …

By comparing and analyzing the uniaxial compressive strength (UCS) of macroporous and microporous basalt under MSL, the following conclusions can be drawn: (1) The peak strength of the basalt with large porosity (B2) was the highest (UCS B2 = 87.55 MPa), whereas the peak strength of the basalt with small porosity (B4) was the lowest (UCS B5 ...

Dynamic compressive properties of Kalgoorlie basalt rock

In this study, the basalt rock extracted from the Kalgoorlie region of Western Australia is intensively studied on its compressive properties under both static and dynamic loads covering strain ...

Compressive stress–strain relationship and its variability of basalt

Increasing the content of basalt fibers to a certain extent can enhance the compressive strength of RAC, but it also significantly increases the variability of material performance. Additionally, the minimum compressive strengths of these three sets of specimens are 19.3, 19.7, and 21.0 MPa, respectively, indicating that the influence of fiber ...

(PDF) CALCULATION OF SAFE BEARING CAPACITY BASED …

compressive strength, index-to-strength conversion factors are used. These factors have been These factors have been proposed by var ious r esearchers a nd are dependent up on rock t ype.

Mechanical Properties and Damage Evolution Characteristics …

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 rocks and thus ...

Calculating the cohesion and internal friction angle of volcanic rocks …

Figure 4: Uniaxial compressive strength as a function of porosity for [A] andesite, [B] basalt, [C] dacite, [D] py- roclastic rocks, and [E] the compiled dataset. The data presented here are for ...

Failure behavior and strength model of blocky rock mass …

The uniaxial compressive strength (UCS) is an important rock property for engineering design and construction. Based on the failure mode and mechanical behaviours of joints, several theoretical and empirical UCS models have been proposed for jointed rocks, as summarized in Table 1.Jaeger [18] analyzed the triaxial compression tests of rock …

Assessing the uniaxial compressive strength and tangent …

Assessing the uniaxial compressive strength and tangent Young's modulus of basalt rock using the Leeb rebound hardness test Materiales de Construcción 10.3989/mc.2020.15119

Unconfined compressive strength of basalt as a function of the rock

It then reports on coring tests in the same basalt rock (unconfined compressive strength, UCS, of ~280 MPa under simulated martian atmospheric conditions. ... tested the performance of PCD compact ...

Triaxial Compressive Strength, Failure, and Rockburst …

2.1 Materials and Sample Preparation. The rock samples were obtained from boreholes at the depth of about 1000 m beneath the earth's surface, in a deep tunnel in Southwest, China (see Fig. 1a). The total length of the tunnel is 31.00 km, and the maximum buried depth is 2080 m, and the maximum horizontal principal stress value ranges from 16.00 …

Assessing the uniaxial compressive strength and …

compressive strength (UCS) and tangent Young's modulus (E. t) are the main input parameters of the mechanical behavior of rock, especially in ascertain - ing rock shear strength, rock mass rating (RMR), classification, and earth structure design such as foundation and tunneling (1–6). Conducting a UCS test in the laboratory accord -

Uniaxial Compressive Strength

The uniaxial compressive strength test is used to determine the maximum value of stress obtained before failure. The determination of this parameter was carried out on specimens with dimensions 7 × 7 × 7 cm along two orthogonal directions (side A–side C), in order to identify possible anisotropies which were not identified by the test of water absorption by capillarity …

strength and point load strength of basalt New …

property of rock. Uniaxial compressive strength is widely ... much of these relations are not derived for basalt rock (Aggistalis et al., 1996; Al-Harthi et al., 1999; Tugrul, ... Maximum value 9 ...

A review of test methods for uniaxial compressive strength …

The UCS is also a significant parameter for characterization of the mechanical properties of the rock/rock mass (Zhang et al., 2011).In scientific research, the UCS is useful …

Strength and Deformation Characteristics of Rocks

The stress value at the highest point C of the stress–strain curve is called the compressive strength, and it indicates the maximum compressive stress that the rock can withstand under these conditions. For normal rocks, the compressive strength is about 1.5–3 times the elastic limit.

Which of the following has the maximum compressive strength…

Explanation: Basalt: Basalt is a dark-colored, fine-grained, igneous rock. It is hard and tough, difficult to work on it. Its specific gravity&n ... and compressive strength is 150- 185 N/mm 2. It is used in Road metal and foundation work. ... Basalt has the maximum compressive strength. Download Solution PDF. Share on Whatsapp Latest DSSSB JE ...

Shear strength characteristics of basalt fiber-reinforced …

unconned compression strength of ber-reinforced sandy soil. Sharma and Kumar 12 reported that the rela- tive density remarkably a˝ects the ultimate bearing capacity and settlement of ber ...

Empirical Estimation of Uniaxial Compressive …

The uniaxial compressive strength (UCS) is a mechanical property of intact rocks that is important in civil and mining engineering works (Aladejare 2020; Aladejare et al. 2020; Wang and Aladejare 2016a).Design …

Engineering Properties of Rocks Contents 1.0 …

2.1 Crushing Strength It is also termed as compressive strength of a stone. It may be defined as maximum force expressed per unit area which a stone can withstand. Any force beyond the compression strength will cause a failure of the stone. Mathematically, compressive strength is expressed by simpler method as follows

11. FOUNDATIONS ON ROCK

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