Compressive strength values of rock materials.
The strength of rocks and soil is a crucial design parameter in engineering projects, and it can be determined through various test methods such as uniaxial compressive strength, tensile strength ...
(PDF) Determination of rock mass compressive strength using critical
— The compressive strength of a rock mass can be determined by in situ testing. Such tests are used in civil engineering and involve among others, plate bearing, hydraulic pressure chamber, flat ...
Rock Properties
— Classifications of intact rock, based on compressive strength and modulus ratio (Young's modulus/compressive strength), developed by and Miller, are given in Tables 2 and 3, respectively. The very high strength category in Table 2 includes rocks like basalt, diabase, and quartzite. Other igneous rocks, limestone, dolomite, and well ...
A Comparative Study of Six Hybrid Prediction Models for …
— Uniaxial compressive strength is an important metric in rock mechanics and rock engineering, particularly in the evaluation of rock slope stability, tunneling design, and ore mining. On the other hand, the laboratory UCS test is time-consuming and costly.
Prediction of Uniaxial Compressive Strength of Some Sedimentary Rocks
— The purpose of this research is to construct predictive models to estimate the uniaxial compressive strength (UCS) of grainstone, wackestone-mudstone, boundstone, gypsum, and silty marl in the Qom area (central Iran). For this purpose, a series of rock mechanics tests were applied and indices such as block punch index, point load …
Determination and applications of rock quality designation …
— Kulhawy and Goodman (1987) suggested that, as a first approximation, the unconfined compressive strength σ cm of rock masses be taken as 0.33σ c when RQD is less than about 70% and then linearly increase to 0.8σ c when RQD increases from 70% to (see Fig. 8), where σ c is the unconfined compressive strength of the intact rock.
Uniaxial Strength
The uniaxial strength, also known as the unconfined compressive strength, of a rock may be regarded as the highest stress that a rock specimen can carry when a unidirectional stress is applied, normally in an axial direction to the ends of a cylindrical specimen.It represents the maximum load supported by a specimen during the test divided by the cross …
IS 13365-1 (1998): Quantitative classification system of …
IS 13365 ( Part1 ) : 1998 3.1.5 Ground Water Condition In the case of tunnels, the rate of inflow of ground water in litre per minute per 10m length of the tunnel
Evaluation of empirical estimation of uniaxial compressive strength …
— The uniaxial compressive strength (UCS) of rock is an important parameter required for design and analysis of rock structures, and rock mass classification. Uniaxial compression test is the direct method to obtain the UCS values. However, these tests are generally tedious, time-consuming, expensive, and sometimes impossible to perform …
Standard Test Method for Unconfined Compressive Strength of Intact Rock
— Scope1.1 This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens.1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values gi
A numerical integrated approach for the estimation of the …
— The point load test (PLT) has been considered a flexible approach to estimate the uniaxial compressive strength (UCS) of rocks. Previously, empirical equations were obtained by mathematical fitting or machine learning to predict the UCS of rocks. The acquisition of these equations usually required a large amount of experimental data, …
Prediction of Uniaxial Compressive Strength of Rock Via …
— The uniaxial compressive strength (UCS) is an important index for rock classification and rock mass quality evaluation. As one of the indispensable mechanical parameters in rock mass engineering design and stability analysis, UCS had been included in various standards and engineering codes, and its research significance could not be …
Rock Mechanics
Intact Rock • Strength classification is based on strength of the rock (compressive strength & modulus of elasticity; Table 7.2) • 5 strength classes: A-E based on the overall rock …
Prediction of Uniaxial Compressive Strength of Rock Using …
— The uniaxial compressive strength (UCS) of the rock is one of the most important rock properties in geotechnical and mining engineering. UCS of rock is the one essential parameter used for the characterization of the rock mass in various systems such as rock mass rating (RMR), Q-system, and Hoek–Brown failure criterion [].UCS is typical …
Rock Strength
The key rock strength parameters include unconfined compressive strength (UCS), tensile strength (T 0), cohesion (C 0), and the coefficient of internal friction (ϕ). Rock strength …
Prediction of Uniaxial Compressive Strength of Rocks from …
— Rock engineering tasks like tunnelling, dam and building construction, and rock slope stability rely heavily on properly estimating the rock's uniaxial compressive strength (UCS), a crucial rock geomechanical characteristic. As high-quality specimen are not always possible, scientists often estimate UCS indirectly. The primary objective of …
Comparative Evaluation of Empirical Approaches and …
— The uniaxial compressive strength (UCS) of rocks is one of the key parameters for evaluating the safety and stability of civil and mining structures. In this study, 386 rock samples containing four properties named the load strength (PLS), the porosity (Pn), the P-wave velocity (Vp), and the Schmidt hardness rebound number (SHR) are …
Point Load Test
Point Load test is an alternate method that can be used to adequately predict the uniaxial compressive strength of a rock material using a portable and simpler equipment. Schmidt Hammer Rebound test is also a technique used for this purpose but, it is admitted that its results are far more variable and affected by testing methods. ...
Triaxial Compressive Strength, Failure, and Rockburst …
— Deep underground rock tunnels and caverns in mountainous areas are often subjected to the coupling impacts of high geo-stresses and high-ground temperature that can threaten the stability of rock masses. This paper presents an experimental study of strength, deformation, and failure as well as energy evolution characteristics for …
Dynamic mechanical properties of different types of rocks …
— The uniaxial compressive strength of the rock specimens was tested using a SHT4106 microcomputer-controlled electro-hydraulic servo universal testing machine with a maximum load of 1000 kN, which ...
A new empirical formula for evaluating uniaxial compressive strength
— Uniaxial compressive strength (UCS) is an important mechanical parameter for rock classification, rock mass engineering design and rock mass stability analysis, and it can also be used to assess rock material strength in Rock Mass Rating (RMR). 1 Conventionally, the UCS of rocks can be determined by the uniaxial compressive tests, …
Triaxial Compression Test in Rock
where σ ci is the uniaxial compressive strength, m i is a constant based on the rock type, σ 1 and σ 3 are the principal stresses. After conducting at least 3 triaxial tests in different lateral pressures, the best-fit envelopes of the criterion selected are plotted and the parameters of each one (cohesion, friction angle in M-C and m i, σ ...
An intelligent approach to predict unconfined compressive strength …
— Unconfined compressive strength (UCS) of rocks is one of the most important parameters in rock engineering, engineering geology, and mining projects. In the laboratory determination of UCS, high-quality samples are necessary; in which preparing of core samples has several limits, as it is difficult, expensive, and time-consuming. For …
Determination of the Uniaxial Compressive Strength of Rocks …
— The uniaxial compressive strength (UCS) is classified as one of the basic mechanical properties of rocks, which is widely used in mining and construction practice.
Compressive Strength of Rocks
The compressive strength of a rock is the maximum stress that it can withstand before it fails when subjected to a compressive load. Compressive strength is an important property of rocks in many …
Compressive Strength of Rocks
The compressive strength of a rock is the maximum stress that it can withstand before it fails when subjected to a compressive load. Compressive strength is an important property of rocks in many engineering applications, such as the design of foundations, dams, and tunnels. The following table provides a comprehensive list of compressive ...
Prediction of compressive strength of the welded matrix-rock …
— Consequently, the bimrock with a rock-type matrix is the typical cemented matrix-rock mixture, and the conceptual strength model of welded and unwelded cemented matrix-rock mixtures is illustratively shown in Fig. 1 referring to the work of Sonmez et al. 11 The matrix-rock boundary is an essential factor in the mesomechanical framework of …
A review of test methods for uniaxial compressive strength of rocks …
— The uniaxial compressive strength (UCS) of rocks is a vital geomechanical parameter widely used for rock mass classification, stability analysis, and engineering design in rock engineering. Various UCS testing methods and apparatuses have been proposed over the past few decades. The objective of the present study is to summarize …
Empirical relations between rock strength and physical …
In this study, 31 empirical equations are summarized that relate unconfined compressive strength and internal friction angle of sedimentary rocks (sandstone, shale, and …
A review of test methods for uniaxial compressive strength of rocks …
— The uniaxial compressive strength (UCS) of rocks is a vital geomechanical parameter widely used for rock mass classification, stability analysis, and engineering design in rock engineering ...
Effects of mineralogical composition on uniaxial compressive …
— According to the compression testing results, carbonate rocks exhibited more substantial rock resistance than those of sandstone and shale rocks, distinguished by the largest uniaxial compressive strength (being 108.07 MPa), as shown in Fig. 2 a. Among the three kinds of rocks, shale specimens had the smallest compressive strength of 45.62 …
Rock Strength
The key rock strength parameters include unconfined compressive strength (UCS), tensile strength (T 0), cohesion (C 0), and the coefficient of internal friction (ϕ). Rock strength parameters are typically measured with core, but can be estimated from log data using empirical correlations.