brittle strength of basaltic rock masses with

Brittle strength of basaltic rock masses with applications ...

1993-6-25  The properties of basaltic rock masses provide a more precise estimate of the strengths of basaltic lava flows on the terrestrial planets than other, more widely used approaches (intact rock or frictional strength of a through-going surface). Rock mass strength is defined by three parameters including unconfined compressive strength of intact ...

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Brittle strength of basaltic rock masses with applications ...

1993-6-25  The properties of basaltic rock masses provide a more precise estimate of the strengths of basaltic lava flows on the terrestrial planets than other, more widely used approaches (intact rock or frictional strength of a through‐going surface). Rock mass strength is defined by three parameters including unconfined compressive strength of intact ...

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Brittle strength of basaltic rock masses with applications ...

1993-6-1  Brittle strength of basaltic rock masses with applications to Venus. Schultz, R. A. Abstract. Laboratory measurements of rock deformation in the brittle regime provide constraints on the response of rocks to stress. These values are essential parameters in tectonic models of near-surface deformation because they influence both the stress state ...

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Limits on the brittle strength of planetary lithospheres ...

2015-10-30  Given the range of uncertainties of the strength parameters for basaltic and other polycrystalline mafic rock masses discussed in section 2, the radius change calculations were performed with nominal values (Table 1), consistent with the standard numbers for these rock types on Earth, and with a range of reported values [e.g., Schultz, 1995 ...

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Physical and mechanical properties of rock masses at ...

2005-10-26  Schultz RA (1995) Limits on strength and deformation properties of jointed basaltic rock masses. Rock Mech Rock Eng 28(1):1–15. Article Google Scholar Schultz RA (1996) Relative scale and the strength and deformability of rock masses. J Struct Geol 18(9):1139–1349. Article Google Scholar

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Limits on strength and deformation properties of jointed ...

A study of strength and deformation measurements for basaltic rocks, along with consideration of the influence of fracturing using a rock mass classification system, documents the range of brittle response for basaltic rock masses. Although basalts vary widely in composition and other physical factors, many of the properties of a basaltic rock mass appear to vary within a factor of about 10 ...

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Strength and deformation properties of basaltic lava flows ...

1993-1-1  Strength and deformation properties of basaltic lava flows on planetary surfaces Basaltic rocks are thought to constitute a volumetrically significant rock type on the Moon, Mercury, Mars, and Venus, in addition to the Earth. Spacecraft images of surfaces with known or suspected basaltic composition on these bodies, particularly on Venus, indicate that these rocks have been deformed in the ...

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Relative scale and the strength and deformability of rock ...

1996-9-1  The basaltic rock mass is also weaker in tension, .2 to 2 MPa, than the intact basalt, -14 MPa. Similarly, the unconfined compressive strengths are reduced by com- parable amounts, from about 160 to 20-60 MPa for the welded tuff, and from 260 to 10-65 MPa for the basalt. Cohesive strengths of the rock masses are also reduced significantly.

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(PDF) Physical and mechanical properties of rock masses at ...

Physical and mechanical properties of rock masses at Stromboli: A dataset for volcano instability evaluation December 2005 Bulletin of Engineering Geology and the Environment 64(4):419-431

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LIMITS ON THE BRITTLE STRENGTH OF PLANETARY

2014-1-6  Therefore, the strength parameters for intact rock must be adjusted by using RMR. It is apparent from Figure 1 that the calculated planetary radius change decreases exponentially with decreasing RMR values. Basaltic rock masses are found to have typical RMR values between 45 and 75 [15], corresponding to a fair to good rock mass quality.

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(PDF) Strength and deformation properties of basaltic lava ...

A basaltic rock mass is the relevant material for which strength properties must be defined and calculated model stresses must be compared to in order to more accurately predict brittle deformation.

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Limits on the brittle strength of planetary lithospheres ...

2015-10-30  Fractured rock masses can accommodate substantial strain prior to faulting Amount of global contraction is higher than from mapping alone Prefaulting strain requires an onset of

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Strength of jointed rock masses - icevirtuallibrary

2020-1-22  Strength of jointed rock masses E. HOEK* Jointed rock masses comprise interlocking angular par- ticles or blocks of hard brittle material separated by discontinuity surfaces which may or may not be coated with weaker materials. The strength of such rock masses depends on the strength of the intact pieces and on their

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Physical and mechanical properties of rock masses at ...

2005-10-26  Schultz RA (1995) Limits on strength and deformation properties of jointed basaltic rock masses. Rock Mech Rock Eng 28(1):1–15. Article Google Scholar Schultz RA (1996) Relative scale and the strength and deformability of rock masses. J Struct Geol 18(9):1139–1349. Article Google Scholar

Read More
Rock mass properties - Rocscience Inc.

2021-11-12  Rock mass properties Introduction Reliable estimates of the strength and deformation characteristics of rock masses are required for almost any form of analysis used for the design of slopes, foundations and underground excavations. Hoek and Brown (1980a, 1980b) proposed a method for

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CLASSIFICATION // CHARACTERIZATION OF SOME

2015-2-13  Intact rock strength . The uniaxial compressive strength of a rock material constitutes the highest strength limit of the rock mass of which it forms a part. It is determined in accordance with the standard laboratory procedures. For the purpose of rock mass classification, the use of the well -known point load strength index can be useful as the

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Strength of large rock masses Field verification U.S ...

1999-6-7  Methods used for assessing the shear strength of large rock masses are based on empirical criteria, with the Hoek-Brown criterion having received widespread interest and use over the last 15 years. As a general rule such criteria are based on laboratory scale specimens with very little, and often no, field validation.

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Basalt - Igneous rocks

Basalt is a major rock type that occurs in virtually every tectonic setting. Basalt is clearly the most common volcanic rock on Earth and basaltic rocks (including gabbro, diabase and their metamorphosed equivalents) are the most common rocks in the crust 2.Basalt is also common on the Moon and other rocky planets of the Solar System.

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Deformation and Failure Characteristics of the Rock

The deformation and failure characteristics of deep rock masses are the focus of this study on deep rock mass engineering. The study identifies the deformation and failure characteristics of a deep cavern under different ground stress conditions using model test and theoretical analysis methods. First, the similarity theory for model tests is introduced, and then the scale factors used in the ...

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(PDF) Strength and deformation properties of basaltic lava ...

A basaltic rock mass is the relevant material for which strength properties must be defined and calculated model stresses must be compared to in order to more accurately predict brittle deformation.

Read More
LIMITS ON THE BRITTLE STRENGTH OF PLANETARY

2014-1-6  Therefore, the strength parameters for intact rock must be adjusted by using RMR. It is apparent from Figure 1 that the calculated planetary radius change decreases exponentially with decreasing RMR values. Basaltic rock masses are found to have typical RMR values between 45 and 75 [15], corresponding to a fair to good rock mass quality.

Read More
Strength of jointed rock masses - icevirtuallibrary

2020-1-22  Strength of jointed rock masses E. HOEK* Jointed rock masses comprise interlocking angular par- ticles or blocks of hard brittle material separated by discontinuity surfaces which may or may not be coated with weaker materials. The strength of such rock masses depends on the strength of the intact pieces and on their

Read More
Rock Properties - Western University

2010-1-19  strength and/or deformation ppproperties of the rock. • According to the classification system recommended by the International Society of Rock Mechanics (ISRM 1978c), rock may range from extremely weak to extremely strong depending on the unconfined compressive strength (or Point Load Strength Index) or approximate field identification.

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Lectures on Rock MechanicsLectures on Rock Mechanics

2010-8-11  • Shear strength ofShear strength of therockmassthe rock mass ... stress level and rock type • Failures are often brittle (soils strain soften or harden past the peak strength) ... Rock MassesRock Masses • C t i di ti iti ith littl t ilContain discontinuities with little tensile strength • Scale effect

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Rock mass properties - Rocscience Inc.

2021-11-12  Rock mass properties Introduction Reliable estimates of the strength and deformation characteristics of rock masses are required for almost any form of analysis used for the design of slopes, foundations and underground excavations. Hoek and Brown (1980a, 1980b) proposed a method for

Read More
Strength of large rock masses Field verification U.S ...

1999-6-7  Methods used for assessing the shear strength of large rock masses are based on empirical criteria, with the Hoek-Brown criterion having received widespread interest and use over the last 15 years. As a general rule such criteria are based on laboratory scale specimens with very little, and often no, field validation.

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Examples of common failure modes observed in hard

Therefore, for massive to moderately jointed rock masses composed of homogeneous rocks, the intact rock strength can be determined using UCS, triaxial compressive strength (TCS), and Brazilian ...

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Deformation and Failure Characteristics of the Rock

The deformation and failure characteristics of deep rock masses are the focus of this study on deep rock mass engineering. The study identifies the deformation and failure characteristics of a deep cavern under different ground stress conditions using model test and theoretical analysis methods. First, the similarity theory for model tests is introduced, and then the scale factors used in the ...

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Deformation of Rock - Tulane University

2 天前  As we go deeper in the Earth the strength of these rocks initially increases. At a depth of about 15 km we reach a point called the brittle-ductile transition zone. Below this point rock strength decreases because fractures become closed and the temperature

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