The uniaxial compressive strength (UCS) is an essential parameter to study rock characteristics, determined by direct and indirect methods. However, the direct methods of determining rock UCS are lengthy and arduous, presenting a requirement of developing a robust indirect method. This investigation introduces an optimal …
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1.. IntroductionRock engineers widely use the uniaxial compressive strength (UCS) of rock in designing surface and underground structures. The procedure for measuring this rock strength has been standardised by both the American Society for Testing and Materials (ASTM) [1] and the International Society for Rock Mechanics …
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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 ...
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The point load test (PLT) has been considered a flexible approach to estimate the uniaxial compressive strength (UCS) of rocks. Previously, empirical …
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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 …
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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 …
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Uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) of the rock material are important engineering parameters in designing of surface and underground structures in rocks.
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sci is the uniaxial compressive strength of the intact rock pieces mi, s and a are material constants determined from the GSI rating Substituting s3 ' = 0 into this equation gives the uniaxial compressive strength of the rock mass as: a sc =sci.s (2) Consider an example in which a rock mass is defined by the following parameters:
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1. Introduction. Unconfined compressive strength (UCS) determination of rocks plays a significant role in the analysis of geotechnical problems such as dam and tunnel design, drilling and mechanical rock excavation [1].The UCS of the rock is determined directly by testing the compressive behavior of the rock specimens under …
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Uniaxial compressive strength (UCS) and point load strength (PLS or Is(50)) are fundamental mechanical parameters in rock engineering. Investigating the relationship between UCS and PLS is also one of the important research contents in rock mechanics, however, the relationship is usually complex and changeable. This paper …
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Uniaxial compressive strength (UCS) is one of the most important parameters to characterize the rock mass in geotechnical engineering design and construction. In this study, a novel kernel extreme learning machine-grey wolf optimizer (KELM-GWO) model was proposed to predict the UCS of 271 rock samples. Four …
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In engineering practices, it is critical and necessary to either measure or estimate the uniaxial compressive strength (UCS) of the rock. Measuring the UCS of rocks requires comprehensive studies ...
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This paper compares different soft computing methods to estimate the uniaxial compressive strength (UCS) of sandstones from Jharia, Dhanbad, India. The …
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1. Uniaxial compressive strength (UCS) is one of the most commonly used design parameters for rock characterisation in rock engineering practice such as for design, analysis and construction in ope...
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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 …
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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. This study collected 1080 datasets consisting …
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Based on their Uniaxial Compressive Strength, rocks can be characterized from very weak to very strong as following: Table 1:Classification of rock hardnesses (from Attewell & Farmer 1976). The range of the Uniaxial Compressive Strength for a large amount of typical rock types is …
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Uniaxial compressive and tensile strengths are considered key properties for characterising rock material in engineering practice. They are determined, directly and indirectly, as described by the International Society for Rock Mechanics (ISRM) and the American Society for Testing Materials (ASTM) ().The point load strength index (PLSI), …
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An ensemble tree-based machine learning model for predicting the uniaxial compressive strength of travertine rocks. Neural Comput. Appl. 2019, 32, 9065–9080. [Google Scholar] Gockceoglu, C.; …
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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 …
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One of the parameters which affect the uniaxial compressive strength (UCS) of rock materials is the length to diameter ratio (L/D) of test cores. ASTM recommends a ratio of between 2 and 2.5, and ISRM suggests 2.5–3:1. Research has shown that high UCS values are obtained for L/D ratios <2, a very slight difference in …
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Uniaxial compressive strength (UCS) is a critical parameter in the disaster prevention of engineering projects, requiring a large budget and a long time to estimate in different rocks or the early stage of a project. If predicted accurately, the UCS of rocks significantly affects geotechnical applications. This paper develops a dataset of 734 …
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The effect of exposure to high temperature on rock strength is a topic of interest in many engineering fields. In general, rock strength is known to decrease as temperature increases. The most common test used to evaluate the rock strength is the uniaxial compressive strength test (UCS). It can only be carried out in laboratory and …
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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 …
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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.
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The rock uniaxial compressive strength (UCS) is an indispensable parameter in rock mass stability analysis, underground chamber excavation, and support design for transportation, mines, and …
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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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PART 2. SUGGESTED METHOD FOR DETERMINING DEFORMABILITY OF ROCK MATERIALS IN UNIAXIAL COMPRESSION 4. CALCULATIONS (a) The uniaxial compressive strength of the specimen shall be calculated by dividing the maximum load car- ried by the specimen during the test, by the original cross-sectional area. 1.
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The uniaxial compressive strength (UCS) is an important parameter for rock mass classification and rock engineering designs. This study proposes a novel method for predicting the UCS of rocks using X-ray computed tomography and convolutional neural networks. First, X-ray CT scanning was conducted on five …
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The strength of the rock sample has a dip effect. Given the same size, the tests results show that the larger the dip angle is, the smaller the peak strength. The ratio of compressive–shear strength to uniaxial compressive strength is called the compression–shear coefficient, which is expressed as the degree of dip effect.
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Uniaxial compressive strength (UCS) is the most widely used mechanical property parameter for rocks, and uniaxial compression tests are comparably accessible …
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