Estimation of Rock Strength Properties Using Selected Mechanical Parameters Obtained During the Rotary Drilling

2019 ◽  
Vol 100 (2) ◽  
pp. 177-186 ◽  
Author(s):  
C. R. Lakshminarayana ◽  
Anup K. Tripathi ◽  
Samir K. Pal
Keyword(s):  
Rock Strength ◽  
Strength Properties ◽  
Mechanical Parameters ◽  
Rotary Drilling

scholarly journals Moisture-Dependent Strength Properties of Thermally-Modified Fraxinus excelsior Wood in Compression

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1647 ◽  
Author(s):  
Edward Roszyk ◽  
Elżbieta Stachowska ◽  
Jerzy Majka ◽  
Przemysław Mania ◽  
Magdalena Broda
Keyword(s):  
Moisture Content ◽  
Strength Properties ◽  
Treatment Temperature ◽  
Thermal Modification ◽  
Fraxinus Excelsior ◽  
Mechanical Parameters ◽  
Saturation Point ◽  
Wood Moisture ◽  
Intrinsic Anisotropy ◽  
European Ash

European ash (Fraxinus excelsior L.) is one of the species commonly used for wood thermal modification that improves its performance. The presented research aimed to investigate a moisture-dependent strength anisotropy of thermally-modified European ash in compression. Wood samples were modified at 180 °C and 200 °C. Their mechanical parameters were determined in the principal anatomical directions under dry (moisture content of 3%) and wet (moisture content above fibre saturation point) conditions. Effect of heat treatment temperature and moisture content on the ash wood mechanical parameters concerning each anatomical direction were determined. The results show that thermal treatment kept the intrinsic anisotropy of wood mechanical properties. It decreased wood hygroscopicity, which resulted in improved strength and elasticity measured for wet wood when compared to untreated and treated samples. Higher treatment temperature (200 °C) increased wood elasticity in compression in all the anatomical directions despite wood moisture content during the measurements. Multivariate analysis revealed that the modification temperature significantly affected the modulus of elasticity perpendicular to the grain, while in the case of compression strength, the statistically significant effect was observed only parallel to the grain. The results obtained can be useful from an industrial perspective and can serve as part of a database for further modelling purposes.

scholarly journals Rock strength properties of granitic rocks in Yosemite Valley, Yosemite National Park, California

Data Series ◽  
2020 ◽  
Author(s):  
Brian D. Collins ◽  
Federica Sandrone ◽  
Laurent Gastaldo ◽  
Greg M. Stock ◽  
Michel Jaboyedoff
Keyword(s):  
National Park ◽  
Rock Strength ◽  
Strength Properties ◽  
Granitic Rocks ◽  
Yosemite National Park ◽  
Yosemite Valley

scholarly journals Soil and rock strength parameters of the Shiraidake Landslide, Japan

2001 ◽  
Vol 23 ◽  
Author(s):  
Robert Jelinek ◽  
Prem Prasad Paudel ◽  
Hiroshi Omura
Keyword(s):  
Rock Strength ◽  
Sedimentary Rocks ◽  
Strength Properties ◽  
Triaxial Tests ◽  
Dry Density ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Strength Parameters ◽  
Consolidation Pressure ◽  
Early Tertiary

The Shiraidake area of northwest Kyushu has an extensive distribution of landslides. A series of undrained triaxial tests and unconfined compression tests were carried out to investigate the variation of strength properties in a selected borehole from the Shiraidake Landslide. It is a translational landslide (called the Hokusho-type in Japan) and is composed of the Early Tertiary and Quaternary sedimentary rocks that are prone to rapid weathering. Core rock samples and recompacted soil samples were used for the study. The results provided the fundamental characteristics of soil and rock under the triaxial and uniaxial tests, and indicated that the undrained behaviour of tested soils generally depends on the pre-shear consolidation pressure and dry density. In addition, the type of material used and the tests performed are important factors that influence the soil and rock strength.

scholarly journals The control of composition, texture and weathering on the physical and strength properties of selected intrusive igneous rocks from North Pakistan

2021 ◽  
Author(s):  
Muhammad Yasir ◽  
Waqas Ahmed ◽  
Muhammad Sajid
Keyword(s):  
Compressive Strength ◽  
Specific Gravity ◽  
Rock Strength ◽  
Grain Shape ◽  
Strength Properties ◽  
Igneous Rocks ◽  
Grain Sizes ◽  
North Pakistan ◽  
R Value ◽  
Weathering Grades

Abstract This work characterizes intrusive igneous rocks from north Pakistan in terms of their mineralogy, texture and weathering grades and their effect on the physical and strength properties. The mafic and intermediate rocks showed a low cumulative percentage of quartz, feldspar and plagioclase with high specific gravity, strength (i.e. UCS and R-value) and UPV values compared to the felsic rocks. Likewise, samples with anhedral grain shape, irregular boundaries, fine to medium grain size (UD, ANS, CGN) showed higher strength values, that is, 121, 118 and 91 MPa compressive strength and 11, 9, and 12 MPa tensile strengths, respectively. The weathering grades assigned to the investigated samples, such as fresh (WG-I), slightly weathered (WG-II) and highly weathered (WG-III) corresponded well with the physical and strength properties, that is, as the grade increased from WG-I to WG-III, the porosity and water absorption increased (0.28% and 0.72% respectively), whereas the specific gravity, compressive strength and tensile strength decreased (2.04, 20 MPa and 2.5 MPa, respectively, for CGA). The presence of quartz affects rock strength; however, no significant correlation was observed for strength and maximum and mean grain sizes of different minerals.

Sign in / Sign up

Export Citation Format

Share Document