In that paper there is a table of values for design. In the table the closest rock type to fractured basalt is just plain basalt with a working bond of 1.21-1.38 N/mm^2 and an ultimate bond of 3.86 N/mm^2. You might use a working bond of 1.2 N/mm^2 to determine the allowable capacity of a dowel grouted into the rock.
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AbstractThere has been a lot of interest in the relationship between uniaxial compressive strength (UCS) and other properties of rock. Evaluation of rock parameters such as cohesion, Young's modulus, angle of friction, and Poisson's ratio is required for ...
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Once the sample size was ≥500 mm, the CoV fell below 10 %, and the BTS stabilized, suggesting that the numerical model at this size could represent the entire basalt rock blocks. The REV size of the basalt rock blocks containing hidden joints, determined by the dispersion and fluctuation in the BTS across different sample sizes, was 500 mm.
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This article is a theoretical study for describing the acceptance of cohesion weakening-frictional strengthening for rocks with very high strength, very high GSI values and …
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Establishing shear strength parameters, cohesion and friction angle of rock mass, is an essential task in the design of dam foundations, tunnels, shafts, nuclear waste repositories, caverns for ...
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This paper is based on the results of in-situ and laboratory direct tests of basalt rock mass with columnar joints.Allometric curves are fitted with the test data and empirical formulas are obtained about the shear strength of the basalt rock mass with columnar joints.The analysis shows that the values of the cohesion c and the internal frictional coefficient f vary approximately with the size ...
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Basalt fiber was bought from Shijiazhuang Zhuzhong Technology Co., Ltd (Hebei, China). The diameter and density of basalt fiber was 10 μm and 2.65 g/cm 3, the tensile strength nearly 4000 MPa ...
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The shear strength properties of rock materials, cohesion and internal friction angle, are determined by carrying out tri-axial strength test on cylindrical core specimens in laboratory.
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Great similarity between the shear strength of rock joints and rockfill is demon-strated, and the interface strength between rockfill and a rock foundation is also addressed. Rock masses, implying problems of large-scale interaction with engineering structures, may have both cohesive and frictional strength components. However,
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In such cases, the ultimate skin friction proposed for design should not exceed the minimum shear strength. For strong rocks where there is an absence of shear strength data or field pull–out tests, the ultimate skin friction may be taken as 10 % of the unconfined compressive strength (UCS) of the rock up to a maximum value of 4.0 MPa or 4 ...
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For basalt with hidden cracks, the UCS change trend with the increase in the sample size is in good agreement with the HB model overall, while this downward tendency is more evident, leading to a higher power exponent and a larger REV size, that is, a more significant size effect of the rock strength, which is mainly due to the occurrence of ...
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When damage in a rock mass appears and cohesive strength is exceeded, residual strength is given mainly by increasing friction. ... Liu JF (2011) Depth-dependent mechanical parameters of basalt: an experimental study. In: Kwasniewski M, Li X, Takahashi M (eds) True triaxial testing of rocks. CRC Press, pp 351–361. Google Scholar Download ...
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geological strength index (GSI) classification for very weak and sheared rock masses. The case of the Athens Schist Formation E. Hoek 7 P. Marinos 7 M. Benissi AbstractThe Athens Schist Formation includes a wide variety of metasedimentary rocks, varying from strong or medium strong rocks such as sericite me-tasandstone, limestone, greywacke ...
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The strength of intact rock materials is often linked to their cohesion and friction angle described by Mohr–Coulomb criterion. A common assumption in the Mohr–Coulomb criterion is that these two strength related components are mobilized simultaneously at the same displacements. Review of previous studies on the brittle failure of rock materials shows that …
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Basalt was used as an ornamental stone in many historic and ancient cities in Jordan. Measuring the uniaxial compressive strength (UCS) and the tangent Young's modulus (E t) in the laboratory ...
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Values of tensile and cohesive strength for the basaltic rock mass are generally one to two orders of magnitude lower than corresponding values for intact basalt. The shear strength of joints …
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Basalt fibers are an environmentally friendly material made from melted basalt rock at a high temperature of 1500 °C and then quickly morphed into a continuous fiber by extrusion through 6–30 μm filament nozzles. ... upon adding a nominal dosage of cement, a steady increase in the cohesive strength was noted, with c increasing from 108 kN/m ...
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The rock sample has a high-elastic modulus and is a high-strength rock. By observing the rocks in the field, it was determined that the basalt rocks in this area are characterized by a very dense lithology, with columnar joints developed and occasional almond-shaped pores. ... Cohesion (MPa) Friction angle (°) Basalt: 2.97: 59.2: 0.18: 184: 27 ...
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Rocks are rated on the on the Moh's Hardness Scale which rates the rocks on the scale from 1 to 10. Rocks with hardness 1-3 are soft rocks from 3-6 are medium hardness rocks and 6-10 are hard rocks. The hardness of Basalt is 6 whereas its compressive strength is 37.40 N/mm 2. Streak is the color of rock when it is crushed or powdered. The ...
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Corresponding values for a basaltic rock mass that incorporate the weakening effects of scale (but not elevated temperature) are: Deformation modulus, 5–50 GPa; …
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Rock strength is imperative for the design and stability analysis of engineering structures. The Mohr–Coulomb (M-C) criterion holds significant prominence in geotechnical engineering. However ...
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The safe and sustainable design of rock slopes, open-pit mines, tunnels, foundations, and underground excavations requires appropriate and reliable estimation of rock strength and deformation characteristics. Cohesion …
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Monte Carlo simulations of a primitive model (PM) for ion confinement, instead, have proven that ions, confined in water between charged surfaces, can induce net attractive forces for a range of surface charge densities relevant to C-S-H (6, 17, 18) because of the correlations that stem from the discrete nature of ions.Nevertheless, these PM studies predict cohesive strengths at most …
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Understanding the physical and geotechnical properties of basalt rocks is essential for ensuring the stability and safety of structures built on or within these formations. It is crucial to...
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Influence of sample size on the mechanical properties of basalt rock blocks with hidden joints: (a) uniaxial compressive strength, (b) tensile strength, (c) cohesive strength, and …
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Tensile strength: MPa: 15: Cohesion: MPa: 40: ... the strength of basalt particles appears to be more sensitive to the changes in morphological parameters compared to LBS particles, whose calculated results display a relatively discrete pattern and are less influenced by particle morphology. ... The effect of size on the strength of coarse rock ...
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This paper is in two parts. The first part presents an overview of the strength of intact rock. A short commentary on various methods of fitting failure criteria to experimental data follows, it ...
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