influences on strength of rock
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influences on strength of rock

INFLUENCE OF INTACT ROCK STRENGTH ON ROCK

2016-1-10  INFLUENCE OF INTACT ROCK STRENGTH ON ROCK MASS MECHANICAL PROPERTIES ABSTRACT The Synthetic Rock Mass (SRM) approach has the potential to capture the mechanical behavior of large rock samples. In order for the method to be used with confidence it is necessary to gain a good understanding of the factors that influences its analysis.

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Influence of heterogeneity on rock strength and stiffness ...

2017-8-1  Influences of microscopic factors on macroscopic strength and stiffness of inter-layered rocks — revealed by a bonded particle model Journal of Mechanics , 24 ( 4 ) ( 2008 ) , pp. 379 - 389 View Record in Scopus Google Scholar

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Influences of Loading Condition and Rock Strength to the ...

The influences of displacing angle, joint gap, and rock strength to the performance of rebar bolts and D-Bolts are evaluated in this study. A new method was developed to apply pull and shear loads ...

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Influences of Loading Condition and Rock Strength to the ...

2015-3-10  The influences of displacing angle, joint gap, and rock strength to the performance of rebar bolts and D-Bolts are evaluated in this study. A new method was developed to apply pull and shear loads to the bolt specimen in any combination so that a displacing angle can be established in the range from 0 (pure pull) to 90° (pure shear).

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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

2006-3-19  STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression 2.2 Point Load Testing 2.3 Uniaxial Tension 2.4 Indirect Tension Tests 2.5 Shear Tests 2.6 Confined Compression Tests (Triaxial Tests) 2.7 Biaxial and Multiaxial Tests 2.8 Other Tests 3. PARAMETERS AFFECTING ROCK

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Rock Mechanics - University of Notre Dame

2015-10-23  • Strength classification is based on strength of the rock (compressive strength modulus of elasticity; Table 7.2) • 5 strength classes: A-E based on the overall rock strength; A = very strong, E = very weak (Table 7.3) • Any discontinuities, fractures, bedding planes, etc. will strongly influence overall strength of the rock.

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Compressive strength of rocks - PetroWiki

2015-6-4  Estimating compressive strength. General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C 0).Lithology is commonly derived during log analysis, so m may be estimated (Table 1).What is needed still is an initial measure of rock strength provided by C 0. C 0 can be estimated from porosity or sonic velocities, but

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Chapter 4 Engineering Classification of Rock Materials

Table 4–12 Summary of the influences of fracture attributes on 4–19 erodibility of a rock mass Part 631 National Engineering Handbook Engineering Classification of Rock ... continuities within a rock mass, therefore, reduce its strength and stability and reduce the energy required to excavate or erode it.

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The Hoek–Brown failure criterion and GSI – 2018 edition ...

2019-6-1  The Hoek–Brown criterion was introduced in 1980 to provide input for the design of underground excavations in rock. The criterion now incorporates both intact rock and discontinuities, such as joints, characterized by the geological strength index (GSI), into a system designed to estimate the mechanical behaviour of typical rock masses encountered in tunnels, slopes and foundations.

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List the factors that influence the strength of a rock ...

2014-6-18  There are four factors that influence the strength of a rock. These factors are, time, pressure, the type of rock. and temperature.

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STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

2006-3-19  STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression 2.2 Point Load Testing 2.3 Uniaxial Tension 2.4 Indirect Tension Tests 2.5 Shear Tests 2.6 Confined Compression Tests (Triaxial Tests) 2.7 Biaxial and Multiaxial Tests 2.8 Other Tests 3. PARAMETERS AFFECTING ROCK

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Using Artificial Neural Networks to Predict Influences of ...

Once trained, the proposed artificial neural network model generates an excellent prediction accuracy for influences of high dimensional heterogeneous parameters and strain rate on rock strength. The sensitivity analysis indicates that strain rate is the most important physical quantity affecting the strength of heterogeneous rock.

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Influences of Microscopic Factors on Macroscopic Strength ...

Following, the microscopic factors, including the bond strength, the bond stiffness, type of bonds and friction of particles and type of bond stiffness, are varied to study their influences. As expected, the bond strength and the bond stiffness are found to have a direct and significant influence on the macroscopic uniaxial compressive strength ...

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Influences of Loading Condition and Rock Strength to the ...

2015-3-10  The influences of displacing angle, joint gap, and rock strength to the performance of rebar bolts and D-Bolts are evaluated in this study. A new method was developed to apply pull and shear loads to the bolt specimen in any combination so that a displacing angle can be established in the range from 0 (pure pull) to 90° (pure shear).

Read More
Influence of Super-Critical CO2 on the Strength and ...

The influences of brine salinity and scCO2 injection on the uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and fracture toughness of sandstone were investigated.

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Influence of Aggregate Characteristics on Concrete

2017-5-16  Correlation between aggregate tests and tests on rock cores. (a) aggregate dynamic modulus carried out at NIST and either transverse dynamic modulus or static modulus carried out on rock cores at TFHRC. Dashed line indicates line of equality. (b) apparent specific gravity carried out on aggregates and compressive strength carried out on rock cores.

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Practical Rock Engineering Chapter 4 Shear Strength of ...

2021-11-12  Shear strength of rock discontinuities 5 Figure 4: Patton’s experiment on the shear strength of saw-tooth specimens. Barton’s estimate of shear strength Equation (4) is valid at low normal stresses where shear displacement is due to sliding along the inclined surfaces. At higher normal stresses, the strength of the intact material

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Particle flow analysis of the influences of joints on rock ...

2016-12-15  the influences of joints on rock mechanical properties has practical significance in engineering practice. 2. State of the art The mechanical properties of jointed rock mass are complex. The strength and deformability of the rock mass are heavily influenced by

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PERMEABILITY AND POROSITY OF ROCKS AND THEIR

2012-9-25  strength, or durability. On the basis of known character of porosity, predicting rock behaviour under different environmental conditions and its usage is considered. One of the most important parameters is the pore size and pore size distribution. Pores are classified according to four groups depending on the access

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List the factors that influence the strength of a rock ...

2014-6-18  There are four factors that influence the strength of a rock. These factors are, time, pressure, the type of rock. and temperature.

Read More
what influences the strength of a rock - autolav.fr

The shear strength of a discontinuity in a soil or rock mass may have a strong impact on the mechanical behavior of a soil or rock mass. The shear strength of a discontinuity is often considerably lower than the shear strength of the blocks of intact material in between the discontinuities, and therefore influences, for example, tunnel, foundation, or slope engineering, but also the stability ...

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Some influences of rock strength and strain rate on ...

Some influences of rock strength and strain rate on propagation of rock avalanches. Bowman, Elisabeth. ; Rait, Kim. Abstract. Rock avalanches are extreme and destructive mass movements in which large volumes of rock (typically >1 million cubic metres) travel at high speeds, covering large distances, and the occurrence of which is highly ...

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influences on strength of rock - lesaintvivien.fr

Influences of petrographic and textural properties on the ... The strength of rock material is obtained generally from compressive strength tests, especially uniaxial applied stress, which is standardized by ASTM (1999) on cube samples and ISRM (2007) on core samples in the laboratory.

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Influences of Loading Condition and Rock Strength to the ...

2015-3-10  The influences of displacing angle, joint gap, and rock strength to the performance of rebar bolts and D-Bolts are evaluated in this study. A new method was developed to apply pull and shear loads to the bolt specimen in any combination so that a displacing angle can be established in the range from 0 (pure pull) to 90° (pure shear).

Read More
Influences of Microscopic Factors on Macroscopic Strength ...

2011-5-5  Following, the microscopic factors, including the bond strength, the bond stiffness, type of bonds and friction of particles and type of bond stiffness, are varied to study their influences. As expected, the bond strength and the bond stiffness are found to have a direct and significant influence on the macroscopic uniaxial compressive strength ...

Read More
Influence of Super-Critical CO2 on the Strength and ...

The influences of brine salinity and scCO2 injection on the uniaxial compressive strength (UCS), Brazilian tensile strength (BTS) and fracture toughness of sandstone were investigated.

Read More
Practical Rock Engineering Chapter 4 Shear Strength of ...

2021-11-12  Shear strength of rock discontinuities 5 Figure 4: Patton’s experiment on the shear strength of saw-tooth specimens. Barton’s estimate of shear strength Equation (4) is valid at low normal stresses where shear displacement is due to sliding along the inclined surfaces. At higher normal stresses, the strength of the intact material

Read More
Particle flow analysis of the influences of joints on rock ...

2016-12-15  the influences of joints on rock mechanical properties has practical significance in engineering practice. 2. State of the art The mechanical properties of jointed rock mass are complex. The strength and deformability of the rock mass are heavily influenced by

Read More
PERMEABILITY AND POROSITY OF ROCKS AND THEIR

2012-9-25  strength, or durability. On the basis of known character of porosity, predicting rock behaviour under different environmental conditions and its usage is considered. One of the most important parameters is the pore size and pore size distribution. Pores are classified according to four groups depending on the access

Read More
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