widely used to estimate the UCS, there are many problems and limitations related to this method as reported in the recent literature. It was obtained that CST proposed in this paper namely "Core Strangle Test (CST)" had minimized some of the deficiencies, limitations etc. The principle of this test depends on the "strangle"
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Point load index test Rocks Core strangle test abstract A new testing method for the indirect determination of unconfined compressive strength (UCS) of rock core samples is presented. As known, there exist several methods for indirect estimation of UCS, such as point load index (I s), Schmidt hammer, sonic velocity, block punch strength test ...
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The UCS test is standardized by the American Society for Testing and Materials 1 and the International Society for Rock Mechanics 2, and it is widely accepted test used to attain the strength of ...
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Considering laboratory Unconfined Compressive Strength (UCS) values of the rock materials, International Society of Rock Mechanics ... The researcher mentions that any load reading in core strangle test may not be obtained for very weak and weak rocks, the cutting device may not work properly, the samples may squeeze, and for this …
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In 2009, the Core Strangle Test (CST) was developed, which has the advantage of applying load through a circle perpendicular to the core axis. In this paper, the results of designing and manufacturing a CST machine, which has been performed for the first time in Iran, are described in order to estimate the UCS of rocks with high accuracy and ...
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The UCS test requires well prepared samples and to some extent is time consuming, expensive and difficult to carry out in the field. ... [18] presented a new testing method called "core strangle test (CST)" for the indirect determination of unconfined compressive strength (UCS) of rock core samples. The principle of this test depends on …
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An index test for strength classification of rock materials is described. The test uses portable equipment. Specimens require no machining and can take the form of either rock core or irregular lumps.
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Amongst the various strength characteristics of rocks, the uniaxial compressive strength (UCS) is the parameter most frequently employed to evaluate rock mass classifications and analyze slope stability, and it is also helpful when evaluating the drillability and cuttability of rocks used for tunneling (Thuro 1997).Proper determination of …
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Unconfined compressive strength. In this study, three or more core rock samples were used in unconfined compressive strength tests with θ =0°, 90°, and …
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Suitable core samples may not always be available for uniaxial compressive strength test in weak rock, and UCS testing equipment and procedure are sophisticated and time-consuming. Therefore, many empirical equations have been suggested to estimate UCS from point load testing data.
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Use of the core strangle test for tensile strength estimation and rock mass classification. Int. J. Rock Mech. Min. Sci. (2010) B. Adebayo et al. ... (UCS) of intact rock when drilled cores are not available. Indentation test (IT) and point load test (PLT) are the two widely used methods in the field to assess the rock strength by penetrating ...
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The UCS test is standardized by the American Society for Testing and Materials 1 and the International Society for Rock Mechanics 2, and it is widely accepted test used to attain the strength of ...
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The "core strangle test" (CST) proposed in this paper overcomes some of these deficiencies and limitations. ... (UCS) test. The rock, which units at the dam site are ophiolitic rocks of Upper ...
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The core strangle test ( Fig. 6) was intended by Yilmaz [21] as an index test for the strength classification of rock materials, and for determination of unconfined compressive strength. The test measures the Core Strangle Index (CSI) of rock samples in the form of core having a length of 25 mm or more, and rock samples are broken by the …
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performance of CST to determine UCS of porous rocks is not yet investigated. The objective of this study is to test the performance and the usefulness of Core Strangle …
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Two testing techniques were employed in this investigation. The uniaxial compression test was used to determine the UCS of rock samples and five gasnailers were performed to obtain penetration depths (h) in different energy levels (e) and nail diameters (d). The details of each testing method are explained in the following subsections. 3.2.1.
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This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D 2938 except that the cores are tested after cutting without grinding, and neoprene caps are used on the specimen ends. Unconfined Compressive …
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Measuring unconfined compressive strength (UCS) using standard laboratory tests is a difficult, expensive, and time-consuming task, especially with highly fractured, highly porous, weak rock. This study aims to establish predictive models for the UCS of carbonate rocks formed in various facies and exposed in Tasonu Quarry, northeast …
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The uniaxial compressive strength (UCS) is an inportant input parameter in rock mass classification systems and in various design approaches. A standard UCS test requires high quality core samples POINT LOAD TEST Presence of thin bedding or schistosity planes Rock cores divided into small discs Core length BLOCK PUNCH INDEX TEST, BPI …
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The unconfined compressive strength (UCS) of intact rocks is an important geotechnical parameter for engineering applications. Determining UCS using standard laboratory tests is a difficult, expensive and time consuming task. This is particularly true for thinly bedded, highly fractured, foliated, highly porous and weak rocks. Consequently, …
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The core strangle test (CST) was intended in [3] as an index test for the strength classification of rock materials, and for determination of unconfined compressive strength. The test measures the core strangle index ( CSI ) of rock specimens in the form of core having a length of 25 mm or more, and rock specimens are broken by the load …
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The unconfined compressive strength (UCS) of rock is a basic parameter for the design of foundations resting on rock. However, it is often very difficult to retrieve intact rock core specimens for the UCS test due to mechanical breaking or natural fracturing of the rock core during the drilling process. In such cases, it becomes obligatory to …
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Compressive Strength (UCS) of the rock core samples is herein presented. As known, there are some methods for indirect estimation of UCS such as; point load index (I s), Schmidt hammer, sonic velocity, block punch strength test etc. However point load index testing method is widely used to estimate the UCS, there are many problems and
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different rock failure modes under uniaxial compression test. When uniaxial compressive strength (UCS) increased for the rock then the different types of failure modes can be seen accordingly. Generally rock samples fail through one or more extensional planes of the fracture development in brittle crystalline rock materials.
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The core strangle test is intended as an index test for the strength classification of rock materials, and for determination of unconfined compressive strength. The test measures the core strangle index ( CSI ) of rock specimens in the form of core having a length of 25 mm or more, and rock specimens are broken by the load applied …
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The first objective of this study is to evaluate the usefulness of core strangle test in determination of strength anisotropy and to compare its accuracy with other …
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The objective of this study was to test the performance and evaluate the usefulness of CST in determination of unconfined compressive strength of porous rocks. …
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The UCS of the specimen is calculated by dividing the maximum load carried by the specimen during the test, by the average cross sectional area. Report. The U.C.S. is reported for each specimen in the sample, together with the average result of the sample. The U.C.S. value is expressed to 3 significant figures.
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et al. 2004) and core strangle test (Yilmaz 2010). For some of these studies, rock fabric, mineralogic and petrographic ... predictive models of UCS for rock engineering applica-tions (Meulenkamp ...
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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 …
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