what influences the strength of a rock

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

In general, compared to intact rock, a rock mass has reduced tensile strength (almost zero), and reduced shear strength especi ally along discontinuity planes. Furthermore, if a rock mass is cut by directional joint sets , the rock mass strength is anisotropic. Rock mass strength is scale dependent and varies with the volume of rock under ...

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Rock Strength - an overview ScienceDirect Topics

Rock strength is specified in terms of tensile strength, compressive strength, shear strength, and impact strength. In the context of fracture gradient, only the tensile strength of rock is of importance. The tensile strength of rock is defined as the pulling force, required to rupture a rock sample, divided by the sample’s cross-sectional area.

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Influence of rock percentage on strength and

Jul 18, 2020  高达10%返现  The strength and permeability of tailing-waste rock mixtures directly affect deposits’ stability for an alternative co-disposal technique. In the mixed co-disposal method, the void of the waste rock is filled with tailings, while the waste rock forms the particle skeleton. This method does not only improve deposits stability but also potentially reduces acid pollution. In this study, the ...

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Compressive strength of rocks - PetroWiki

Jun 04, 2015  Fluids can alter rock mechanical properties through fluid pressure, chemical reactions with mineral surfaces, and by lubricating moving surfaces. These effects are discussed in Pore fluid effects on rock mechanics. Effect of grain size and texture. In granular rocks, grain size also influences strength.

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Rock Mechanics

• 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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8. STRENGTH OF SOILS AND ROCKS

The tensile strength of soil is very low or negligible and in most analyses it is considered to be zero. In contrast a number of direct or indirect tensile strength tests are commonly carried out for rock. In a direct tensile strength test a cylindrical rock specimen is stressed along its axis by means of a tensile force.

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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 ... tend to control the strength of the rock mass if discontinuities are widely spaced or if the intact rock material is inherently weak or altered. Dis-continuities within ...

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Section 1 Rock Deformation

factors that influence the strength of a rock and how it will deform include temperature, confining pressure, rock type, and time. Temperature and Pressure Rocks deform permanently in two ways: brittle deformation and ductile deformation. Rocks near the surface,

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Estimating Rock Mass Strength - BM 1997 02

The strength of jointed rock masses is notoriously difficult to assess. Laboratory tests on core samples are not representative of a rock mass of significantly larger volume. On the other hand, in situ strength testing of the rock mass is seldom practically or economically feasible.

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A Comparative Review of Rippability Factors and ...

factors, such as rock hardness, weathering, joint spacing and continuity, and strike and dip of the bedrock. The simplicity of the rippability chart coupling with uncertainties in seismic velocity measurement leads to inconsistent rippability outcomes determined from the interpretation and actual construction. ...

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INFLUENCE OF INTACT ROCK STRENGTH ON ROCK MASS

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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Lecture 9 – Introduction to Rock Strength David Hart ...

that rock strength is affected by the SIZE of the specimen tested. This can be explained simply as being the result of the many flaws found in rock in the form of fissures, pores, cleavage, bedding planes, foliation, etc. The larger the size of the specimen tested the higher the probability that a weak flaw will be available, capable of ...

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Factors affecting strength of the rock mass Flashcards ...

Start studying Factors affecting strength of the rock mass. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

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Dynamic increase factors of rock strength — Monash University

Understanding dynamic mechanical response of rocks subjected to extreme loadings is necessary in rock engineering analysis and design. The dynamic increase factor (DIF), is usually defined as the ratio of the dynamic strength to the quasi-static strength in uniaxial compression or tension, which has been widely accepted as an important parameter to measure rate sensitivity of brittle materials.

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8. STRENGTH OF SOILS AND ROCKS

The tensile strength of soil is very low or negligible and in most analyses it is considered to be zero. In contrast a number of direct or indirect tensile strength tests are commonly carried out for rock. In a direct tensile strength test a cylindrical rock specimen is stressed along its axis by means of a tensile force.

Read More
Influence of heterogeneity on rock strength and stiffness ...

Aug 01, 2017  The influence of relative strengths of lithological units of the heterogeneous rocks on the overall strengths and stiffnesses of the composite heterogeneous rock specimens was also investigated. This paper first gives an overview of the mechanical responses of composite rocks, and then the simulation approach is presented.

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Estimating Rock Mass Strength - BM 1997 02

The strength of jointed rock masses is notoriously difficult to assess. Laboratory tests on core samples are not representative of a rock mass of significantly larger volume. On the other hand, in situ strength testing of the rock mass is seldom practically or economically feasible.

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

Mar 10, 2015  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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Influencing Factors on Strength of Waste Rock Tailing ...

Oct 19, 2020  To study the strength influence of cemented rock tailing backfill from different factors, lead-zinc mine tailings and limestone with particle size less than 10 mm were selected as aggregates, and a typical P.O32.5 Portland cement was used as the cementing material.

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Investigation of the influence mechanism of rock damage on ...

May 01, 2019  Rock damage is one of the key factors in the design and model choice of mining machinery. In this paper, the influence of rock damage on rock fragmentation and cutting performance was studied using PFC 2D.In PFC 2D software, it is feasible to get rock models with different damage factors by reducing the effective modulus, tensile and shear strength of bond by using the proportional factors.

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(PDF) Influence of Rock Inhomogeneity on the Dynamic ...

It has been widely accepted that tensile strength plays a dominant role in the failure mechanism of rock or rock-like material. Tensile strength is determined mainly via two methods: the direct ...

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What are the most important parameters effective on the ...

And then of course there are all parameters considered in different classification systems, where you can easily see which one influences the rock mass quality (and thereby its strength) the most ...

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Shear Strength Evaluation of Clay-Rock Mixtures

the effect of rock particles is typically disregarded in shear strength analysis. The two primary reasons for this are: l) a lack of agreement concerning the influence of rock particles on material strength, and 2) the expense and difficulty of testing clay-rock mixtures with existing laboratory procedures. These factors

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Influence of Asperity Morphology on Failure ...

The asperity morphology has profound influences on the failure characteristics and shear strength of rock joints. To investigate these influences, degradation characteristics and mechanical properties were studied based on direct shear tests conducted on six groups of artificial rock joints with regular profiles.

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Geological Influences on the Strength of Rocks and ...

The procedure is applied to a number of rock sample photos, which were taken as part of a data set of compressive and tensile strength testing on a variety of rock types. The individual influences are examined and the resulting effects on the value of "mi" are discussed.

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INFLUENCE OF INTACT ROCK STRENGTH ON ROCK MASS

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.

Read More
What factors determine the strength of a rock? - Quora

Apr 26, 2021  The principal factors controlling the strength of solid rocks are: 1. Mineral composition, structure and texture; Rocks containing tectosilicates like Quartz and Feldspars are strong like Granite and Quartzite, whereas rocks that have phyllosilica...

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What factors determine the strength of a rock? - Answers

Dec 12, 2010  The factors that influence the strength of a rock and how it will deform include temperature, confining pressure, rock type, and time.

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

Mar 10, 2015  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
(PDF) Influence of Water Content on the Strength of Rock ...

Research of influence of saturation with water was made on intact material from this area on physical and mechanical properties of the rock: uniaxial compressive strength, module of deformation ...

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(PDF) Influence of Rock Inhomogeneity on the Dynamic ...

It has been widely accepted that tensile strength plays a dominant role in the failure mechanism of rock or rock-like material. Tensile strength is determined mainly via two methods: the direct ...

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(PDF) Dynamic increase factors of rock strength

DIFs of rock-like materials increases gradually with. strain rate in the low region (10 -6 ~10 0 s -1 ), and exhib-. its to a rapid increase in the intermediate (10 -1 ~10 1 s -. 1) and high (10 1 ...

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Investigation of the influence mechanism of rock damage on ...

May 01, 2019  Rock damage is one of the key factors in the design and model choice of mining machinery. In this paper, the influence of rock damage on rock fragmentation and cutting performance was studied using PFC 2D.In PFC 2D software, it is feasible to get rock models with different damage factors by reducing the effective modulus, tensile and shear strength of bond by using the proportional factors.

Read More
What are the most important parameters effective on the ...

And then of course there are all parameters considered in different classification systems, where you can easily see which one influences the rock mass quality (and thereby its strength) the most ...

Read More
THE INFLUENCE OF MOISTURE CONTENT ON THE COMPRESSIVE ...

THE INFLUENCE OF MOISTURE CONTENT ON THE COMPRESSIVE STRENGTH OF ROCKS. Knowledge of the physical properties of rock is of detector windows and building large d-spacing analyzing are influenced by a number of factors, one of which is the moisture content of the rock.

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Effect of blasting on the strength of rock fragments ...

To estimate in-situ rock mass strength, the specific energy of drilling (SE) was calculated during blast hole drilling utilizing a continuous drill monitoring system. Post-blast fragmentation was estimated using the Split image processing system. Results from the study support the idea that increases in blast energy can enhance crushing and ...

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Using Artificial Neural Networks to Predict Influences of ...

Jun 03, 2021  predict the influences of heterogeneity on rock strength at different strain rates. The ANN model is implemented in Matlab (R2020a). Th e raw dataset is collected from our previous 84 Brazilian disc tests [31 33]. In these tests, 3D-printed Brazilian disc specimens with pre-

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USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL ...

This index can be used to estimate other rock strength parameters. The focus of this paper is to present the data analysis used to correlate the point load test index (Is50) with the uniaxial compressive strength (UCS), and to propose appropriate Is50 to UCS conversion factors for different coal measure rocks. The rock strength determined by ...

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