Unconfined compressive strength (UCS) prediction in real …
Unconfined compressive strength (UCS) is a major mechanical parameter of the rock which has an essential role in developing geomechanical models. It can be estimated directly by lab testing of retrieved core samples or from well log data. These methods are very expensive and require huge efforts and time. Therefore, there is a …
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(PDF) Effect of Specimens' Height to Diameter Ratio on Unconfined …
The undrained shear strength (Su) and cohesion (Cu) of cohesive soils are frequently determined using an unconfined compression test. However, the test results are heavily dependent on specimen size.
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Effect of length-to-diameter ratio on the unconfined …
The unconfined compressive strength (q u), which accurately describes the undrained conditions of fine-grained (cohesive and semicohesive) foundations, is widely used in almost all geotechnical engineering applications, such as buildings, bridges, dams, and embankments.Two soil parameters, the undrained shear strength (S u) and …
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Scale effects in rock strength properties. Part 1: Unconfined
Apart from conventional mechanical rock properties (unconfined compressive and tensile strength, Young's modulus) a new property for toughness referring to drillability has been introduced: the ...
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Unconfined Compressive Strength of Aqueous …
strength and compressive strain of the specimens after a cur-ing time of 0, 7, 14, 21, and 28 days, respectively. The max-imum compressive strength was observed in the case of 1.5% ZM after a curing period of seven days.In this case, the com-pressive strength increased from 700kPa for specimens without ZM to 1561kPa. The …
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Unconfined compressive strength of clay soils at different …
Unconfined compressive strength ((S_{u})) is one of the soil engineering parameters used in geotechnical designs.Due to the temperature changes caused by some human activities, it is important to study the changes in (S_{u}) at different temperatures. On the other hand, due to the differences in the mineralogical composition of clay soils, …
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Effect of unconfined compressive strength of rock on …
The effect of different unconfined compressive strengths (UCS) of rock on the extent of damage produced due to blast loading has been investigated. UCS representing …
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Universal confined tensile strength of intact rock
The rock tested was Longmaxi Shale, characterized by consistent discontinuities (bedding planes) and a strength under unconfined compression of 73.3 …
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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 ... and limestone and dolomite) to physical properties (such as velocity, modulus, and porosity). These equations can be used to estimate rock strength from parameters measurable with geophysical well logs. The ability ...
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[PDF] Predicting the Uniaxial Compressive Strength and …
The uniaxial compressive strength and static Young's modulus ( Es ) of intact rocks are the most important geotechnical parameters for stability analysis of surface and underground structures. These parameters are obtained by the uniaxial compressive test. Although this test is simple, the preparation of the samples, especially of soft rocks, is a hard and time …
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Prediction of unconfined compressive strength of carbonate rocks …
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 ...
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Prediction of unconfined compressive strength of geopolymer stabilized
Three different types of soil designated as S 1, S 2 and S 3 in the present study were undertaken. The soils were collected from three different locations in Silchar city within 2 m of the ground surface.The engineering properties of the soils conforming to relevant Indian Standard Code of Practice are presented in Table 1mercially …
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Effect of length-to-diameter ratio on the unconfined …
1. ASTM D2166-00 (ASTM 2002a) specifies that the test specimen should be a right circular cylinder with a minimum diameter of 1.300 and a height-to-diameter ratio of 2–2.5
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Effect of unconfined compressive strength of rock on …
UCS representing dolomite, shale, sandstone, granite, basalt and quartzite medium has been investigated through a three-dimensional finite element model having dimensions of 30 m × 30 m in cross section and 35 m in length generated in Abaqus. ... the effect of unconfined compressive strength (UCS) of the rock surrounding the tunnel has been ...
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Estimation of Unconfined Compressive Strength (UCS) of …
Central Alborz Zone (CAZ) is one of the most important zones in Iran, which comprises a wide variety of carbonate rocks such as limestone, dolomite, and their compounds. Therefore, determining engineering geological characteristics of carbonate rocks is essential for proper use in civil, mining, and geotechnical engineering. The …
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Indirect estimation of unconfined compressive strength of carbonate
The unconfined compressive strength (UCS) of rocks, one fundamental parameter, is widely used in geotechnical engineering. Direct determination of the UCS involves expensive, time-consuming and destructive laboratory tests. These tests sometimes are difficult to be prepared for cracked rocks. In this way, indirect estimation …
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Prediction of unconfined compressive strength of rock surrounding …
pressive strength values, a description of the rock type is ... Dolomite 143 19. Marble 135. ... Assessments of failure mode and strength behavior of unconfined anisotropic rock mass are difficult ...
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Prediction of the unconfined compressive strength of soft …
Many studies have shown that artificial neural networks (ANNs) are useful for predicting the unconfined compressive strength (UCS) of rocks. However, ANNs do have some deficiencies: they can get trapped in local minima and they have a slow learning rate. It is widely accepted that optimization algorithms such as particle swarm optimization …
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Physical Parameters, Tensile and Compressive Strength of …
The Brazilian tensile strength, point load index and unconfined compressive strengths (UCS) of these rocks samples were also found out. The test results showed that there …
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Empirical Estimation of Uniaxial Compressive Strength of …
Empirical relationships for estimating Uniaxial Compressive Strength (UCS) of rock from other rock properties are numerous in literature. This is because the laboratory procedure for determination of UCS from compression tests is cumbersome, time consuming, and often considered expensive, especially for small to medium-sized …
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Estimating unconfined compressive strength and …
This study presents a new set of equations to predict the unconfined compressive strength (UCS) and Young's modulus (E) for three carbonate lithologies: limestone, dolomite, …
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(PDF) Correlation of uniaxial compressive strength with the dynamic
Many of the available correlations for rock strength relate the unconfined compressive strength, UCS, with the P-wave velocity, V p, for example, Azimian et al (2014), Majstorovic et al. (2019 ...
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Estimating Unconfined Compressive Strength of …
The unconfined compressive strength (UCS) is a crucial factor in geotechnical engineering analysis and design, despite the strict test limitations set by codes.
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The Correlation of Unconfined Compressive Strength …
The most common test used to measure the strength of a rock is the unconfined com-pressive strength test (UCS). Once a representative number of UCS tests have been carried out, the confined strength of the rock can be calculated using standard engi-neering calculations. Due to the cost of carrying out numerous UCS tests, …
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dolomite uniaxial pressive strength
STRENGTH OF SOILS AND ROCKS 8.1 COMPRESSIVE STRENGTH For the uniaxial or unconfined compressive strength test a right circular Indiana limestone 6.7 42 ... Effect of Dolomite Limestone Powder on the Compressive Strength MBMST 2013 Effect of Dolomite Limestone Powder on The Compressive Strength of Concrete .
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Intelligent modeling of unconfined compressive strength …
Gene expression programming (GEP) and multi-expression programming (MEP) have been employed to predict models for the unconfined compressive strength of soil under unsaturated (partially saturated to 60%) conditions. Due to the complexity and time consumed during the laboratory estimation of UCS for flexible pavement subgrade …
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Testing and numerical simulation of a medium strength rock …
The unconfined compressive strength (UCS) is one of the most important parameters in characterising rock material behaviour. Hence the UCS is crucial in understanding the failure mechanism of fractured rocks. ... Based on the investigation of the failed rock specimens of sandstones and dolomite under triaxial compression tests, …
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Estimation of strength characteristics of different Himalayan rocks
The relationship between the uniaxial compressive strength of rocks and the point load index has been extensively studied in the literature (Tandon and Gupta, 2015), including cases with ...
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Estimation of strength characteristics of different Himalayan …
Amongst the various strength characteristics of rocks, the unconfined compressive strength (UCS) is the parameter most commonly used 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). In order to gauge the …
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Effect of length-to-diameter ratio on the unconfined …
In this work, the influence of the length-to-diameter ratio (L/D) on the unconfined compressive strength (UCS) of cohesive soil specimens was assessed. An L/D ratio of between 2 and 3 is generally recommended by accepted scientific and technical authorities. Nevertheless, published reports on the effect of specimen shape on soil …
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