An empirical classification method for South Pars marls by Schmidt hammer rebound index

Azarafza, Mohammad; Ghazifard, Akbar; Asasi, Fariba; Rahnamarad, Jafar

doi:10.1016/j.mex.2021.101366

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…After these two tests, Uniaxial Compressive Strength Test (UCS) will be the final method to be tested the strength of the sandstone because it would give harm to the samples. [10].…”

Section: Testing Methodsmentioning

confidence: 99%

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Characterization of Tropical Kenny Hill Weathered Sandstone using Non-Disruptive Testing of Pundit and Resistivity Testing

Hamzah¹,

Yusof²

2022

JMechE

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Rock characterization of tropical Kenny Hill weathered sandstone have been an effort to be explored by using non-disruptive testing of pundit and resistivity testing to undertake sustainability issues and providing technical approach in exploration of weak rock materials solving. The purpose of this research is to determine the relationship between resistivity and uniaxial compressive strength of the most problematic rock type in Malaysia, namely Kenny Hill weathered sedimentary rocks, more usually referred to as sandstone. According to earlier study, sandstone has degraded in quality and has a tendency to disintegrate due to the tropical climate. Sandstone has a higher strength feature as compared to shale from Bandar Nusa Rhu, Shah Alam. Series of uniaxial compression were carried out to obtain the strength for rock samples. The strength properties of weathered sandstone are studied to quantify the weathering impact to these materials. Resistivity test and Pundit test were laboratory method conducted on the rock samples for verification of the correlation between resistivity and uniaxial compression. Results from the test were analyzed and their relationship with weathering grade was established. It signifies that sandstone strength increasing with the weathering grade.

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“…After these two tests, Uniaxial Compressive Strength Test (UCS) will be the final method to be tested the strength of the sandstone because it would give harm to the samples. [10].…”

Section: Testing Methodsmentioning

confidence: 99%

“…Additionally, it provides a variable rate of loading with data that is accurate to two decimal places. Uniaxial Compression Strength is the most extensively used method for determining strength since it is the most standardised [10,17,18,19]. The two loading faces of machine are parallel to each other.…”

Section: Pundit Testmentioning

confidence: 99%

Characterization of Tropical Kenny Hill Weathered Sandstone using Non-Disruptive Testing of Pundit and Resistivity Testing

Hamzah¹,

Yusof²

2022

JMechE

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“…Subsequently, many scientific researchers have launched various aspects of related research related to these predictions [8]. These studies have been implemented to complete the advancements of traditional procedures to estimate the geomechanical index properties of rock materials based on UCS, point-load [9], or Schmidt hammer [10] results.…”

Section: Introductionmentioning

confidence: 99%

Support Vector Machine (SVM) Application for Uniaxial Compression Strength (UCS) Prediction: A Case Study for Maragheh Limestone

et al. 2023

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The geomechanical properties of rock materials, such as uniaxial compression strength (UCS), are the main requirements for geo-engineering design and construction. A proper understanding of UCS has a significant impression on the safe design of different foundations on rocks. So, applying fast and reliable approaches to predict UCS based on limited data can be an efficient alternative to regular traditional fitting curves. In order to improve the prediction accuracy of UCS, the presented study attempted to utilize the support vector machine (SVM) algorithm. Multiple training and testing datasets were prepared for the UCS predictions based on a total of 120 samples recorded on limestone from the Maragheh region, northwest Iran, which were used to achieve a high precision rate for UCS prediction. The models were validated using a confusion matrix, loss functions, and error tables (MAE, MSE, and RMSE). In addition, 24 samples were tested (20% of the primary dataset) and used for the model justifications. Referring to the results of the study, the SVM (accuracy = 0.91/precision = 0.86) showed good agreement with the actual data, and the estimated coefficient of determination (R2) reached 0.967, showing that the model’s performance was impressively better than that of traditional fitting curves.

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“…Singh et al [3] discussed an approach to predicting the creep behavior of rock salt using a uniaxial compression testing machine, in which the AE technique used in the study to explain the rock salt behavior is based on a combination of Maxwell and Hooke models, and the proposed model is able to predict the stress-strain response of rock salt with a fair accuracy in both loading and unloading conditions, as well as calculating both elastic and viscous parameters. Azarafza et al [4,5] investigated the geotechnical and geo-engineering properties of the South Pars Zone (SPZ) marls in Assalouyeh, Iran, which have shown that an increase in the carbonate content leads to a decrease in the degradation potential and an increase in the density and strength parameters, such as durability and compressive strength; later, in 2021, they presented an experimental classification for South Pars marls (SPM), southwest of Iran, using the Schmidt hammer rebound index, marl geological classes, and SPM geo-engineering characteristics, and, according to geotechnical experiments results, the Schmidt index shows three main group variations, like Pettijohn's marl classification. Yu et al [6] performed triaxial compression tests on semi-through jointed mudstone samples at conditions of different confining pressures and inclination angles, based on which, a binary-medium constitutive model for semi-through jointed mudstone samples was proposed, and the model shows the effects of inclination angles and confining pressures on jointed mudstone deformation features and gives good predictions both qualitatively and quantitatively.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Binary-Medium-Based Constitutive Model for Coral-Reef Limestone Samples Subjected to Uniaxial Loading

et al. 2022

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The mechanical and deformation mechanism of coral-reef limestone is vital for the stability and safety of infrastructures built on the ground composed of those materials. Upon loading, strain softening behavior of the coral-reef limestone occurs, usually due to the nonuniform cementation distribution, and the cementation within the samples may break up gradually and reduce the bearing capacity. In order to study their mechanical features, uniaxial compression tests were carried out in this study, and, based on the test results, a binary-medium-based constitutive model was formulated, in which, the sample was idealized, respectively, as the bonded and frictional elements. The bonded elements are composed of strong cementation and may gradually break up to transform into the frictional elements, both of which bear the external loading conjointly. In the new model, the parameters determination method was adopted based on uniaxial compression testing, and comparisons were made between the tested and computed results, which demonstrate that the model can reflect the salient features of coral-reef limestone samples, such as the strain softening and bonding breakage during the loading process. The study can provide a basis for the basic design of coral-reef limestone.

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An empirical classification method for South Pars marls by Schmidt hammer rebound index

Cited by 6 publications

References 20 publications

Characterization of Tropical Kenny Hill Weathered Sandstone using Non-Disruptive Testing of Pundit and Resistivity Testing

Characterization of Tropical Kenny Hill Weathered Sandstone using Non-Disruptive Testing of Pundit and Resistivity Testing

Support Vector Machine (SVM) Application for Uniaxial Compression Strength (UCS) Prediction: A Case Study for Maragheh Limestone

Mechanical Properties and Binary-Medium-Based Constitutive Model for Coral-Reef Limestone Samples Subjected to Uniaxial Loading

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