On the reliability of the uniaxial compressive strength obtained from the point load index

2011 ◽  
pp. 837-840
Author(s):  
A Tang
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Point Load Index

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.

scholarly journals Scale Effect and Correlation between Uniaxial Compressive Strength and Point Load Index for Limestone and Travertine

2021 ◽  
Vol 11 (8) ◽  
pp. 3672
Author(s):  
Solange Contreras ◽  
Manuel Saldaña ◽  
Norman Toro ◽  
Ignacio Pérez-Rey ◽  
Manuel A. González ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Scale Effect ◽  
Statistical Models ◽  
Primary Objective ◽  
Point Load ◽  
Reliable Estimate ◽  
Point Load Index ◽  
Statistical Adjustment ◽  
Early Phases

Determining the uniaxial compressive strength of intact rock is the primary objective of a geomechanical project, and a reliable estimate in the early phases saves time and costs for more sophisticated laboratory tests. The problem is knowing which of the correlations between the resistance to uniaxial compression and point load index are reliable, those that cover one or several types of rock (depending on the type of statistical adjustment). In this work, they were evaluated with respect to limestone and travertine from experimental results, and the statistical models of the scale effect of the point load index were determined, and the uniaxial compressive strength being estimated from correlations reported in literature. The limestone model was ascending (strength increases as diameter increases), while the travertine model was descending (strength decreases as diameter increases), obtaining similar exponents for the scale effect equations modeled from the uniaxial compressive strength and point load index in both cases.

scholarly journals Korelasi Nilai Rebound Schmidt Hammer Dengan Nilai Uniaxial Compressive Strength (UCS) Seam Batubara A2 dan C Pada Pit 3 Timur Banko Barat, di PT. Bukit Asam, Tbk

2018 ◽  
Vol 1 (1) ◽  
pp. 301-306
Author(s):  
Andreas Roland Simatupang
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Schmidt Hammer ◽  
Point Load Index

Nilai Uniaxial Compressive Strength adalah gambaran dari nilai tegangan maksimum yang dapat ditanggung sebuah contoh batuan sesaat sebelum contoh batuan tersebut hancur. Hal tersebut merupakan informasi penting dalam menentukan kekuatan dan karakteristik suatu batuan baik massa batuan maupun batuan utuh yang didapat dengan pengujian menggunakan alat UCS. Pada penelitian ini dibuat suatu alternatif dalam menentukan nilai UCS secara instan, yaitu dengan menggunakan Point Load Index dan Schmidt Hammer. Point Load Index dan Schmidt Hammer dinilai sangat mudah dan efektif dalam pengujiannya karena dapat digunakan langsung pada lereng penambangan. Alternatif ini didapat dengan membuat hubungan antara Point Load Index dengan nilai UCS serta Schmidt Hammer terhadap litologi batubara terkhusus pada seam batubara A2 dan C, yang berlokasi pada pit 3 timur banko barat, Sumatera Selatan, pada formasi Muara Enim.

Estimating Uniaxial Compressive Strength of Tropically Weathered Sedimentary Rock Using Indirect Tests

2015 ◽  
Vol 72 (3) ◽  
Author(s):  
Maybelle Liang ◽  
Edy Tonnizam Mohamad ◽  
Ma Chau Khun ◽  
Mohd Nur Asmawisham Alel
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Sedimentary Rocks ◽  
Estimation Procedure ◽  
Point Load ◽  
Rock Mechanic ◽  
Durability Test ◽  
Point Load Index ◽  
Mining Projects ◽  
Indirect Tests

Uniaxial compressive strength (UCS) of intact rock is particularly important in rock mechanic studies, especially for those involving civil and mining projects. However, the determination of UCS using direct test is generally expensive, time consuming and almost impossible in preparation of samples for highly weathered sedimentary rocks. In view of this, indirect tests are comparatively cheap, simpler, faster and more convenient to perform either in laboratory or at site. This paper aims to develop an estimation procedure in determining the UCS values of such weak weathered rocks.  Among the indirect tests present herein are point load index, Schmidt Rebound hammer, Brazilian tensile test and slake durability test. Unfortunately, it was found that the accuracy of each single test varies with weathering states. Hence, a recommended procedure using combined indirect tests in determining UCS of weak sedimentary rocks is presented herein.

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