The determination of uniaxial compressive strength from point load strength for pyroclastic rocks

2014 ◽  
Vol 170 ◽  
pp. 33-42 ◽  
Author(s):  
S. Kahraman
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Point Load Strength ◽  
Pyroclastic Rocks

Classification of Engineering Properties of Tropical Boulder in Completely Weathered Granite in Johor, Malaysia

2020 ◽  
Vol 17 (2) ◽  
pp. 1059-1069
Author(s):  
Mohd Firdaus Md Dan ◽  
Edy Tonnizam Mohamad ◽  
Ibrahim Komoo ◽  
Aziman Madun ◽  
Siti Norsalkini Mohd Akip Tan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Engineering Properties ◽  
Dry Density ◽  
Petrographic Analysis ◽  
Point Load Strength ◽  
Weathered Granite ◽  
Completely Weathered Granite

Engineering properties of tropical weathered granite mass have been widely investigated and classified for engineering purposes. However, the engineering properties of tropical boulder in weathered granite profile is poorly understood and not well classified. This study aims to examine and classify the physico-mechanical properties of granite boulder in completely weathered zone. A total of 34 in-situ boulders were examined from two granite quarries located in Southern Johor, Malaysia. Microstructure-mineralogical alterations were analyzed based on petrographic analysis and scanning electron microscopy (SEM). The mechanical properties were including dry density, porosity, point load strength, uniaxial compressive strength and permeability. Three properties were identified as significant indicators to differentiate between tropical boulder and completely weathered granite when it is evaluated from the soil investigation drilling work namely; texture characteristics, discolourations and degree of weathering. Analysis revealed that the alteration of microstructures and minerals such as feldspar, biotite, and plagioclase from corestone (Grade I/II) to saprolite (Grade IV/V) zone were significantly reduced the dry density, point load strength, uniaxial compressive strength and permeability with 32%, 99.5%, 98.6% and 84.8%, respectively. It has also significantly increased the porosity up to 11.6 times or 1065% from corestone to saprolite. The significant different of physico-mechanical properties of material surrounding boulder due to weathering can be classified and useful in evaluation of geotechnical design and geological engineering applications.

Effect of Rock Properties on Excavation-Loading Operation in Selected Quarries

2013 ◽  
Vol 824 ◽  
pp. 86-90 ◽  
Author(s):  
B. Adebayo ◽  
A.E. Aladejare
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Strong Relationship ◽  
Strength Properties ◽  
Biotite Granite ◽  
Point Load ◽  
Rock Properties ◽  
Filling Rate ◽  
Strength Parameters ◽  
Point Load Strength

The effect of rock properties on excavation-loading operation in quarries was investigated by conducting test on the mechanical properties of selected rocks. These rock samples were tested in the laboratory for specific gravity, point load strength, uniaxial compressive strength and mineral composition using weigh balance, point load tester, 1100kN compression machine and petrological microscope respectively. The filling rates of the front end loaders bucket were determined. The result obtained show that value of uniaxial compressive strength varied from 29.22 MPa-30.87 MPa. The bucket filling rate varied from 0.180-0.250 m3/s and 0.145-0.170 m3/s for porphyritic biotite granite and coarse biotite granite respectively. There is strong relationship between bucket filling rate and strength properties with values of R2 ranging from 0.9737 to 0.9981.Therefore strength parameters of the rock have effect on excavation loading operation in quarries.

Study on the Relation between Uniaxial Compressive Strength and Point Load Strength

2014 ◽  
Vol 501-504 ◽  
pp. 282-285
Author(s):  
Rui Hong Wang ◽  
Yu Zhou Jiang ◽  
Jin Long Guo ◽  
Tian Cai Tang
Keyword(s):  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Point Load ◽  
Load Test ◽  
Key Factors ◽  
Point Load Strength ◽  
Result Show ◽  
Internal Relations ◽  
Rock Specimens ◽  
Test Result

In order to investigate the relation between uniaxial compressive strength and point load strength, several homogeneous rock specimens were tested, and the influence of the different rock type was investigated using regression analysis and the derived equations were statistically tested. The test result show that there are some correlations and trends between uniaxial compressive strength and point load strength, the shape size and lithology of rock specimens have important influence on the result of point load test, and the greain size, the mineral compositon and the structral compact are key factors. It is difficult to realize that using one or several function to describe all internal relations between uniaxial compressive strength and point load strength.

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