Investigation of Point Load Index Using Novel Discrete Based Model

2016 ◽  
Vol 846 ◽  
pp. 348-353
Author(s):  
Somayeh Behraftar ◽  
Joshua Heslin ◽  
S. Galindo Torres ◽  
Alexander Scheuermann
Keyword(s):  
Compressive Strength ◽  
Material Properties ◽  
Mechanical Model ◽  
Rock Type ◽  
Correlation Factor ◽  
Point Load ◽  
Load Test ◽  
Point Load Index ◽  
Bonded Particles ◽  
The One

In this study, a micro-mechanical model is developed to study the correlation of the point load index in rocks with uniaxial compressive strength (UCS) tests. The model is represented by an array of bonded particles simulated by a novel discrete based model, which was introduced by the authors previously. The point load test (PLT) is performed in the field on rock samples to classify and estimate the UCS of a rock type via the index-to-strength correlation factor k. Numerical analyses, such as the one presented in this work, will serve to close the knowledge gap concerning the correlation between k, UCS and other material properties of rocks.

scholarly journals A Comparison Between Schmidt Rebound Hammer Test and Point Load Index Test (IS50) for the Effectiveness in Estimating the Unconfined Compressive Strength of Intact Rock- A Case Study with respect to Limestone of Early Eocene Nammal Formation, Central Salt

2019 ◽  
Vol 10 (2) ◽  
pp. 139-144
Author(s):  
Aun Zahoor ◽  
Muhammad Usman Azhar ◽  
Saif Ur Rehman ◽  
Farrukh Rahim Shehzad
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Point Load ◽  
Load Test ◽  
Index Test ◽  
Rebound Hammer ◽  
Point Load Index ◽  
Test Standards ◽  
Schmidt Rebound Hammer ◽  
High Degree

In a bid to find some possible relation of Unconfined Compressive Strength (UCS) with relatively simplelaboratory tests like Point Load Test (PLT) and Schmidt Rebound Hammer Test (SRHT), some 50 core samples ofMiddle Eocene Nammal formation from Central Salt Range in Pakistan were collected and subjected to these testmethods as per respective test standards of International Society of Rock Mechanics (ISRM). The values of SRHT andPLT were separately compared to the respective values of UCS so as to find the linear relations. On the basis of the R2value of Regression Analysis, it has been found that a strong correlation with a high degree of accuracy exists betweenPLT and UCS while the degree of accuracy between SRHT and UCS was found to be low.

scholarly journals A Comparison Between Schmidt Rebound Hammer Test and Point Load Index Test (IS50) for the Effectiveness in Estimating the Unconfined Compressive Strength of Intact Rock- A Case Study with respect to Limestone of Early Eocene Nammal Formation, Central Salt

2019 ◽  
Vol 10 (2) ◽  
pp. 139-144
Author(s):  
Aun Zahoor ◽  
Muhammad Usman Azhar ◽  
Saif Ur Rehman ◽  
Farrukh Rahim Shehzad
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Point Load ◽  
Load Test ◽  
Index Test ◽  
Rebound Hammer ◽  
Point Load Index ◽  
Test Standards ◽  
Schmidt Rebound Hammer ◽  
High Degree

In a bid to find some possible relation of Unconfined Compressive Strength (UCS) with relatively simplelaboratory tests like Point Load Test (PLT) and Schmidt Rebound Hammer Test (SRHT), some 50 core samples ofMiddle Eocene Nammal formation from Central Salt Range in Pakistan were collected and subjected to these testmethods as per respective test standards of International Society of Rock Mechanics (ISRM). The values of SRHT andPLT were separately compared to the respective values of UCS so as to find the linear relations. On the basis of the R2value of Regression Analysis, it has been found that a strong correlation with a high degree of accuracy exists betweenPLT and UCS while the degree of accuracy between SRHT and UCS was found to be low.

scholarly journals ANALISIS PENGARUH TINGKAT PELAPUKAN TERHADAP KEKUATAN BATUAN (STUDI KASUS PADA BATULEMPUNG DARI FORMASI WARUKIN)

2021 ◽  
Vol 5 (3) ◽  
pp. 89
Author(s):  
Dini Ayu Hanifah ◽  
Eko Santoso ◽  
Kartini Kartini
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Schmidt Hammer ◽  
Point Load Index

Penentuan tingkat pelapukan yang dilakukan pada penelitian ini menggunakan metode yang lebih sederhana dan sering digunakan serta dengan biaya yang terjangkau yaitu dengan pengamatan lapangan secara visual deskriptif dan pengujian di laboratorium berdasarkan uji UCS (Uniaxial Compressive Strength), Schmidt Hammer, dan PLI (Point Load Index). Metodologi yang dilakukan dan digunakan pada penelitian ini meliputi, data tingkat pelapukan berdasarkan pengamatan secara deskripsi visual yang mengacu pada penelitian terdahulu, data uji sifat fisik batulempung, dimensi batulempung, nilai rebound dari alat schmidt hammer, dan nilai kuat tekan batulempung menggunakan alat UCS (uniaxial compressive strength) dari 10 sampel batulempung, serta nilai PLI. Berdasarkan pengamatan lapangan secara visual deskriptif adapun tingkat pelapukan batulempung dalam penelitian ini termasuk ke dalam tingkat pelapukan III (lapuk sedang), IV (lapuk kuat), dan V (lapuk sempurna) yang mewakili 10 sampel ( mengacu pada penelitian Sadisun dkk, 1998 ). Sedangkan berdasarkan nilai UCS yang didapatkan dari nilai kuat tekan tertinggi sampai terendah dari 10 sampel yaitu sebesar 3,39 MPa masuk ke dalam tingkat pelapukan III (lapuk sedang), 1,98 MPa masuk ke dalam tingkat pelapukan IV (lapuk kuat), serta 0,63 MPa masuk ke dalam tingkat pelapukan V (lapuk sempurna). Berdasarkan hasil dari nilai rebound yang didukung dengan penelitian menurut ahli Hencer dan Martin (1982), tingkat pelapukan batulempung dalam penelitian ini masuk ke dalam highly weathered (lapuk kuat) dengan nilai rebound rata-rata sebesar N<25. Dan berdasarkan dari nilai PLI tingkat pelapukan pada penelitian ini masuk ke dalam tingkat pelapukan III dan IV. Kata-kata kunci: tingkat pelapukan, uniaxial compressive strength, schmidt hammer, point load index

scholarly journals Korelasi Point Load Index dan Uniaxial Compressive Strength pada Satuan Batupasir dan Batulempung Formasi Latih untuk Penentuan Koefisien Kekuatan Batuan di Pit X Tambang Batubara PT Berau Coal, Kalimantan Timur

2021 ◽  
Vol 9 (1) ◽  
pp. 9-16
Author(s):  
Yan Adriansyah ◽  
Guruh Krisnantara ◽  
Kurniawan Setiadi
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Mining Industry ◽  
Point Load ◽  
Engineering Properties ◽  
Test Results ◽  
Rock Engineering ◽  
Point Load Index ◽  
Rock Samples ◽  
Laboratory Test Results

Physical and mechanical properties of rock for engineering purposes are indispensable for any civil/construction, mining and other engineering requirment. The results of the uniaxial compressive strength (UCS) test are very much needed in various geotechnical analyzes or engineering, in particular in the mining industry in relation to the calculation of the pit slope design and other mining infrastructure. Rock samples used in this study were obtained from the results of geotechnical drilling (full core drilling). The rock engineering properties test to obtain UCS and PLI values was carried out in the laboratory. Testing the rock hardness index using the point load index (PLI) can be done more quickly, cheaply, practically and can use rock samples with a variety of sample shapes.         The focus and object of the research are mudstone and sandstone units as part of the Lati Formation. These two types of layers are the most dominant rock types as a constituent of the pit slopes in the research area. To ensure that the correlation results are in accordance with the rules of scientific research, the distribution of UCS and PLI data from laboratory test results is verified using a statistical approach / testing. Correlation and analysis between the two rock engineering properties test results are very useful for geotechnical analysis data input. The coefficient or constant values obtained can be used to determine the rock strength values used in various geotechnical analyzes so that the analysis can be carried out more efficiently, effectively and quickly and can support geotechnical engineering work.

INTERDEPENDENCE BETWEEN POINT LOAD INDEX, COMPRESSIVE STRENGTH AND CRUSHING RESISTANCE OF JORDAN OIL SHALE AND RELATION TO CALORIFIC VALUE

Oil Shale ◽  
2015 ◽  
Vol 32 (3) ◽  
pp. 252 ◽  
Author(s):  
V VÄIZENE ◽  
I VALGMA ◽  
J-R PASTARUS ◽  
E REINSALU ◽  
E KAISLA
Keyword(s):  
Compressive Strength ◽  
Oil Shale ◽  
Calorific Value ◽  
Point Load ◽  
Point Load Index
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