The Columbia River Basalt Group (CRBG) consists of a thick sequence of Miocene flood basalt that covered northern Oregon, eastern Washington, and western Idaho between 17 and 6 million years ago. It is an important regional aquifer system, and, in its folded and faulted flows, it records the late Cenozoic structural evolution of much of …
A study of strength and deformation measurements for basaltic rocks, along with consideration of the influence of fracturing using a rock mass classification system, …
The Columbia River Basalt Group (CRBG) consists of a thick sequence of Miocene flood basalt that covered northern Oregon, eastern Washington, and western …
DOI: 10.1016/J.EPSL.2014.05.012 Corpus ID: 129089582; The effects of weathering on the strength and chemistry of Columbia River Basalts and their implications for Mars Exploration Rover Rock Abrasion Tool (RAT) results
Thomson et al. (2013, 2014) illustrated that the energy per unit volume needed to break the bonds of a volume of rock correlates to uniaxial compressive strength (UCS). Even with a chisel style drill bit optimized for percussion, it is understood that rotation contributes to comminution, especially in weaker rocks.
The purpose of this study is to investigate the linked chemical and strength changes undergone by basalt during weathering. Basalt is an important crustal …
It is expected that the above presented data related to the strength of basalt rock will pave the way toward a more rational description of its state. cdry was Table 8 Equations correlating uniaxial compressive strength (UCS) to Is.50 reported in literature References Equation UCS515.3Is.50z16.3 UCS524Is.50 b UCS516Is.50, cUCS520Is.50 a ...
The uniaxial compressive strength (UCS) of rock is one of the key parameters determining the mechanical behavior and failure characteristics of rocks under loading/unloading conditions (Hajiabdolmajid and Kaiser, 2003; Yagiz, 2008; Yarali and Kahraman, 2011; Tan et al., 2016; Xia et al., 2019; Meng et al., 2020; Zhang et al., …
The Columbia River Basalt Group in the northwestern United States1, comprising about 230,000 cubic kilometres of rock, ... elements with respect to high-field-strength …
Several methods have been used to determine the rock tensile properties, such as the uniaxial tension test (Perras and Diederichs, 2014; Rao et al., 2021), the Brazilian test (Li and Wong, 2013), and the three-point bending test (Biolzi et al., 2001; Lochan and Polak, 2022).Generally, rock is not subjected to pure uniaxial tensile stress …
LECTURE THREE WEEK TWO LECTURE ONE UNIAXIAL COMPRESSIVE STRENGTH OF ROCK 1. Introduction Cylindrical specimen of rock loaded axially between steel platen in a testing machine The uniaxial compression test consists of loading a rock specimen in a compression testing machine and continually recording the strains induced in the rock …
1. Introduction. The determination of basic mechanical properties of rocks is crucial to a specific engineering project. Several mechanical properties, including uniaxial compressive strength (UCS), have become widely accepted parameters for rock design projects (Baskerville, 1987).From past to present, direct and indirect methods have been …
The study area is located in the State of Paraná in southern Brazil where the volcanic rocks belong to the Serra Geral Formation, forming the Paraná Volcanic Province (Fig. 1).Based on 40 Ar-39 Ar dating, the continental volcanism generator of PVP was located between 138 and 120 Ma (Renne et al., 1992, Renne et al., 1996, Turner et al., …
The purpose of this study is to investigate the linked chemical and strength changes undergone by basalt during weathering. Basalt is an important crustal component that represents a significant fraction of the surface area of terrestrial bodies (Basaltic Volcanism Study Project, 1981).Martian basalts have been identified from orbital remote …
On Earth, UCS and elastic moduli for intact rock can be measured with uniaxial and triaxial compressive strength tests; however, when geological units are highly fractured, it is more appropriate to estimate these parameters for the rock mass, fractures included. ... 2007 and citations therein), and the stacked basalt flows of the Columbia ...
The Columbia Plateau is the second largest continen- tal flood-basalt province in the world, covering some 164,000 km^ in the Pacific Northwest region of the United States …
The intact rock strength is lower in vesicular-amygdaloidal basalts (58) than in massive basalts (61) and does not explain fully the preferential abrasion in vesicular-amygdaloidal units because potholes occur with varying resistances. ... Sklar and Dietrich, 2001, Stock et al., 2005, Hayakawa et al., 2008), and the strength of basalts is only ...
The uniaxial compressive strength (UCS) of intact rocks is an important and pertinent property for characterizing a rock mass. It is known that standard UCS tests are destructive, expensive and time-consuming task, which is particularly true for thinly bedded, highly fractured, foliated, highly porous and weak rocks.
and uniaxial compression, triaxial compression and true triaxial unloading tests were conducted to determine the anisotropic properties, and unloading failure mechanism of jointed basalt rock. The results show that the dip angle has signicant eects on the strength anisotropy of the columnar jointed rock mass.
If more force than necessary were immediately delivered, one would only know that the strength of the rock had been exceeded. Yet, rock strength would not be quantifiable. A systematic lead-up to failure is essential for both typical rock strength measurements in the laboratory and when using drill performance as an indicator of rock strength.
The cumulative acoustic emission quantity and energy released when the columnar jointed basalts (CJBs) reach their strength under compression are important …
Empirical, core-based, predictive correlations for the calculation of uniaxial compressive strength (UCS) were developed from compressive sonic velocity measurements (55 whole core samples) and porosity, density, and unconfined compressive tests (110 whole core samples).
-2.5MPa; uniaxial compressive strength, 10 90MPa; and cohesion, 0.6-6MPa. A measured deformation modulus for ambient pressure in the vertical direction, 20 GPa, is ... the Columbia River Basalt Group (Reidel et al., 1989a), which is of Miocene age (16-6 Ma). Extensive documentation of the volcanic and structural setting of these ... 3. Strength ...
Uniaxial compressive test is used to determine uniaxial compressive strength, Poisson's ratio, and Young's modulus. Uniaxial compressive test is also ca lled unconfined compressive test.
TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression Recall the typical stress strain response curve for a specimen of intact rock under uniaxial …
Their high degree of durability, since stone structures-built thousands of years ago are still used today, makes stone a natural sustainable building material. Mechanical strength, and especially the uniaxial compressive strength, is a critical parameter for the assessment of the suitability and durability of stone used in all construction works.
DOI: 10.1002/2017gl075965 Corpus ID: 133658157; Uniaxial Compressive Strengths of Rocks Drilled at Gale Crater, Mars @article{Peters2018UniaxialCS, title={Uniaxial Compressive Strengths of Rocks Drilled at Gale Crater, Mars}, author={G H Peters and E. M. Carey and Robert C. Anderson and William Abbey and Ryan L Kinnett and Jessica …
The columnar joint is self-generated tensile fracture structure during the diagenetic process of basalt. The columnar jointed basalt is composed of basalt block and network joint (Ji et al.,2017; Cui et al.,2018).Due to the cutting of joint surfaces, the rock mass forms a polygonal prism with geometric anisotropy (Zhang et al.,2022).Under ideal …
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We measured the density, porosity, P and S wave velocities and attenuation, magnetic susceptibility, uniaxial compressive strength, and tensile strength of 313 …
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