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.
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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 ...
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A New Predictive Model for Uniaxial Compressive Strength of Rock …
Uniaxial compressive strength (UCS) of rocks is the most commonly used parameter in geo-engineering application. However, this parameter is hard for measurement due to a time consuming and requires expensive equipment. Therefore, obtaining this value indirectly using non-destructive testing methods has been a frequently preferred method for a long time. …
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Estimating the uniaxial compressive strength of rocks …
The Schmidt hammer is commonly used for the prediction of unconfined compressive strength and other mechanical properties of rocks from surface rebound hardness values since it is quick, easy, inexpensive, and non-destructive testing method. In this study, metamorphic, sedimentary, and igneous rock samples were collected from various locations …
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New approach for assessing uniaxial compressive strength of rocks …
The uniaxial compressive strength (UCS) of rocks is an essential input parameter for engineering design in mining and civil engineering. This research aimed to investigate the relationship between nano-mechanical properties and macroscopic mechanical properties that result from microstructural constituents of rock materials. Grid nanoindentation technique was …
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Laboratory Testing and Interpretation of Rock …
Common laboratory tests for intact rocks include measu rements of strength (point load index, compressive strength, Brazilian test, direct shear), stiffness (ultrasonics, elastic modulus), and durability (slaking, abrasion). Table 8-1 gives a summary list of laboratory rock tests and procedures by ASTM. Brief sections
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Correlation Between Point Load Index and Uniaxial Compressive Strength
To classify the rocks into hard or soft rocks, it is recommended to consider the compressive strength rather than the index strength, particularly for softer rocks. Bieniawski gave a strength classification for rock material based on the UCS, demarcating hard and soft rocks. Rocks with UCS less than 25 MPa and PLI less than 1 MPa were ...
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Measurement While Drilling Method for Estimating the …
"A method for predicting uniaxial compressive strength of rock mass based on digital drilling test technology and support vector machine." Rock Soil Mech. 40 (3): 1221–1228. Google Scholar. Wang, X., P. Peng, Z. Shan, and Z. Yue. 2022. "In situ strength profiles along two adjacent vertical drillholes from digitalization of hydraulic ...
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Relationship between rock uniaxial compressive strength and digital
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 …
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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 the status and ...
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A Comparative Study of Six Hybrid Prediction Models for …
Keywords: uniaxial compressive strength, rock, BP neural network, swarm intelligence optimization algorithm, normalized mutual information. Citation: Lei Y, Zhou S, Luo X, Niu S and Jiang N (2022) A Comparative Study of Six Hybrid Prediction Models for Uniaxial Compressive Strength of Rock Based on Swarm Intelligence Optimization Algorithms. Front.
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Standard Test Methods for Compressive Strength and …
5.2 Method C, uniaxial compressive strength of rock is used in many design formulas and is sometimes used as an index property to select the appropriate excavation technique. Deformation and strength of rock are known to be functions of confining pressure. Method A, triaxial compression test, is commonly used to simulate the stress conditions under …
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Rock mass properties
Brown criterion for estimating the strength and deformability of jointed rock masses, three 'properties' of the rock mass have to be estimated. These are: ξ uniaxial compressive strength …
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A review of test methods for uniaxial compressive strength …
The uniaxial compressive strength (UCS) of rocks is a vital geomechanical parameter widely used for rock mass classification, stability analysis, and engineering design …
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Effects of porosity and crack density on the compressive strength of rocks
Hence our analysis suggests that an empirical correlation between a seismic wave speed and the uniaxial compressive strength in a suite of rock may exist only if the values of the average crack length, fracture toughness and friction are such that values of the parameter K C / (1 + μ 2 − μ) π c are comparable. Systematic measurements are ...
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Estimation of uniaxial compressive strength of rock materials …
Uniaxial compressive strength (UCS) is one of the most widely used rock mechanical parameters in rock engineering like design and construction of foundations, tunneling, slope stability investigations, etc. UCS is also the only parameter to assess rock material strength in Rock Mass Rating (RMR) proposed by Bieniawski (1989).However, uniaxial …
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Estimating the Mechanical Properties of Rocks and Rock
In the construction processes of underground or mining engineering, the strength and deformation characteristics of rock masses are critical, and are usually described by the …
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Compressive strength of rocks
Compressive strength of rocks. Mechanical failure in rocks generally means either fracturing or permanent deformation as a result of …
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Effect of petrographic characteristics on uniaxial compressive strength …
The petrographic characteristics of rocks are the determining factors affecting their mechanical properties. This study aims to intensively assess the effect degree of petrographic characteristics of granitic rocks on their uniaxial compressive strength (UCS) and determine the dominant factors affecting the UCS. The quantification of various petrographic parameters and …
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Estimating the Mechanical Properties of Rocks and Rock
In the construction processes of underground or mining engineering, the strength and deformation characteristics of rock masses are critical, and are usually described by the elastic modulus and uniaxial compressive strength (UCS) of rocks (Aladejare 2020).These parameters are vital for the engineering design, stability analysis, and classification in rock …
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Application of machine learning in predicting the rate …
Rate dependence of rock strength is a critical issue in rock dynamics, as rock behaviors vary drastically at different strain rates. Understanding the rate-dependent strengths of rocks is important for rock engineering design and construction (Zhao et al., 1999; Hudson, 2012).Our current approaches in determining the compressive strength of rocks rely …
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Prediction of the unconfined compressive strength of soft rocks…
It is also an established fact in the literature that the tensile strength of rock is related to its compressive strength. According to Sheorey (), the compressive strength of rock is ten times higher than its tensile strength.A study by Kahraman et al. shows a linear correlation between UCS and BTS for different rock types.This proposed correlation is in good …
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Preliminary Analysis of the End Friction Effect on Dynamic Compressive
The dynamic and total uniaxial compressive strength (UCS) of three types of specimens under various preloads were measured using the modified SHPB system. ... (FM) specimens were prepared to understand the end friction effect on measuring the dynamic compressive strength of rocks with static preload. Specimen S1 and S3 are cylinders, and ...
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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. ...
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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).
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The Strongest Rock in the World – Rockhound Resource
Close behind diabase in compressive strength come other fine-grained igneous rocks like Diorite, Gabbro, and Basalt. Interestingly, the one non-igneous rock in this super strong group is Quartzite. Quick Conversion: 350 MPa is over 50,000 psi!
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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 limestone …
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A Neuro-Genetic Network for Predicting Uniaxial Compressive Strength of
Uniaxial compressive strength of rocks is a competent parameter for designing surface and underground rock structures (Bieniawski 1974).Direct determination of this parameter in the laboratory is carried out according to standards of the American Society for Testing and Materials (ASTM) and the International Society for Rock Mechanics (ISRM).
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Estimating the unconfined compressive strength of intact rocks …
In order to utilize the Equotip hardness tester, originally developed in the field of metallic engineering, as an indirect method to predict the unconfined compressive strength (UCS) of rock, laboratory tests were undertaken to establish the UCS, Equotip hardness (L-value) and porosity of nine rock types. Using existing data from Verwaal and Mulder (Int J …
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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 utilized to predict the …
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