weathered rock types [1, 2]. For these troubles, UCS has been determined from the use of indirect methods [3]. The Schmidt hammer test was considered for gth rock stren determination [4].The test was standardized by [5] and [6] for collecting valuable data. The Schmidt Hammer is a portable device designed to measure the surface hardness

The scratch test is a quasi-non-destructive method made up of pushing a tool across the surface of a weaker rock at a given penetration depth. The unconfined compressive strength (UCS), fracture toughness (KIC), and other geomechanical parameters influence how geological materials fail, and how the succeeding fractures …

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 …

Laboratory Rock Testing. GeoTesting Express performs a full-range of tests on rock. We prepare and tests rock specimens in-house. Servicing the geotechnical, tunneling, mining and excavation industries, we provide rapid strength and index testing of rock samples. We can prepare test specimens from cobbles, boulders, blocks or cores with our ...

At present, there are several MWD devices developed for laboratory testing. For example, the prediction models of rock uniaxial compressive strength (UCS), cohesion, and internal friction angle was established based on the drilling parameters obtained through the multifunctional rock drilling test system shown in Fig 1(a) [3, 4].

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 ...

Abstract. Point load test (PLT) is a widely used indirect method to estimate the unconfined compressive strength (UCS) of rocks in geotechnical practice. The test consists of loading a rock specimen between two conical platens until failure occurs in order to calculate the point load strength index (Is(50)). Its main advantages are the simplicity …

The profiler core scratch test system is -ments of rock UCS by cutting (scratching) the rock surface. These measurements include evaluating the normal and tangential forces required to create continuous cohesional (i.e., shear) failure along the rock surface under conditions of a constant depth of cut and constant cut velocity. From these measure-

The uniaxial compressive strength (UCS) of rock is widely used in various engineering projects performed in rock environment. Although the method is relatively simple, it is time consuming and expensive. It also requires well-prepared rock cores. For this reason, indirect tests are frequently used to predict the UCS for preliminary studies ...

The uniaxial compressive strength (UCS) test is crucial in determining the strength and stiffness behavior of intact rock and is frequently utilized by industry to determine project site characteristics. A fundamental procedure of UCS testing is strain response measurement. Conventionally, discrete strain measuring devices such as …

Keywords – Rock, point load test, uniaxial compression strength, correlation. I. INTRODUCTION Uniaxial compressive strength is an incontrovertibly ... Various rock types [25] UCS=10.91 I s(50) +27.41 Gypsum [25] UCS=5.575 I s(50) +21.92 The factors that are used in the calculation of the uniaxial

This research presented a new laboratory test for estimating rock's UCS, from rock cuttings. However, to perform the test in this study, an apparatus was used which could carry out uniform, slow, and controlled load on single particles. The UCS of 10 microcrystalline limestone block samples, from Asmari formation outcrops was determined.

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 values between 2 and …

The mechanical parameters, UCS [MPa] and E [GPa] were shown to vary with the foliation-loading angle α (Fig. 3).The higher standard deviations (Table 1) may result from a slight undulation of the planes of weakness inside the rock specimens.The shape of the strength anisotropy corresponds to the interpretation of Ramamurthy (), indicating U …

Procedia Earth and Planetary Science 6 ( 2013 ) 390 â€" 395 1878-5220 2013 The Authors. Published by Elsevier B.V. Selection and/or peer review under responsibilty of Institut Teknologi Bandung and Kyushu University. doi: 10.1016/j.proeps.2013.01.051 International Symposium on Earth Science and Technology, CINEST 2012 Using the …

As per the standard guidelines, the UCS test is carried out on cylindrical rock specimens with length to diameter ratio of 2 to 2.5. The specimens are prepared from rock cores that are obtained from the field by carrying out drilling operations. Sampling and testing for direct determination of UCS of rocks is time-consuming and costly.

The variability (coefficient of variation) of UCS test results for homogeneous rocks is found to be generally <25% while for heterogeneous rocks the variability is >35%. Failure mode variation is ...

In many geo-engineering fields, the uniaxial compressive strength (UCS) of a rock material is the parameter most commonly used to define a rock's mechanical strength. Several international standards have been developed for determining this value, which require the tested material to have certain minimum dimensions and shapes. In many …

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 …

Figure 1 shows a diagram of the UCS test setup and the direction of loading. Figure 1 - Diagram of UCS test setup (Brown, 1981) A geophysical log is a continuous record of measurements made by a probe able to respond to variations in some physical property of a rock mass (Firth, 1999). They are commonly presented as a

The uniaxial compressive strength (UCS) represents the strength of the rock. It frequently requires during the introductory phase of mining projects such as tunneling, rock excavation, blast hole designs, etc. Usually, the determination of UCS of rocks is carrying out in a concerned laboratory. The main drawback of determining the …

From past to present, direct and indirect methods have been used to determine UCS of rocks in field and laboratory. UCS of rocks can be directly measured …

The UCS test simply records the collapse load during uniaxial loading of a cylindrical specimen. As suggested by many, the UCS is an index rather than a unique engineering parameter. The UCS is thus a proxy for rock strength which depends on the loading rate (e.g., Bieniawski 1967), specimen geometry (e.g., Hudson et al., 1971), …

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 …

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 0 …

The Schmidt rebound hammer, which was originally developed in the late 1940s to test the surface rebound hardness of concrete (Schmidt 1951), has been used in rock mechanics practice since the early 1960s, mainly for estimating the uniaxial compressive strength (UCS) and Young's modulus of rock materials (Aydin and Basu …

The uniaxial compressive strength (UCS) is ˙c, while the parameters m, s and a can be evaluated with (2)–(4) and depend on the intact rock parameter (mo), quality index of the rock mass (geological strength index (GSI)) and damage in the rock mass due to human actions (D), which in shallow foundations, is usually equal to zero. m = mo e GSI …

This study evaluates estimation of UCS of rocks from several empirical equations. The study uses data of point load strength (Is (50)), Schmidt rebound …

The UCS test carried out on the Elmina sandstone reveals it to be a weak rock with a strength value of 37.3 MPa whilst the Schmidt Hammer test carried out on the four shale rock samples defined ...