influences on strength of rock

The influence of rock properties and size into strength

Sep 01 2011 0183 32 The strength of soft rock masses is significantly influenced by rock properties and size represented by the constants mu and rho The rock size has taken a dominant part in strength reduction and it is believed that the maximum reduction of around 80 still provides a reasonable value of soft rock mass strength...

Compressive strength of rocks

Jun 04 2015 0183 32 Fluids can alter rock mechanical properties through fluid pressure chemical reactions with mineral surfaces and by lubricating moving surfac 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...

Roughness influence on strength and deformation behavior

rock discontinuities Roko Raoul Olatounbossoun PhD The University of Arizona 1990 Ann Arbor MI48106 ROUGHNESS INFLUENCE ON STRENGTH AND DEFORMATION BEHAVIOR OF ROCK DISCONTINUITIES by Raoul Olatounbossoun Roko A Dissertation Submitted to the Faculty of the DEPARTMENT OF MINING AND GEOLOGICAL ENGINEERING In Partial Fulfillment of the...

Properties of Rocks for Engineering and Construction Purposes

Compressive Strength of rock The RMR value depends up on the unconfined compressive strength Ground water conditions can influence the rock mass behavior to a large extent because of more dependency of rock condition on ground water The rock is assigned the category dry moist water under moderate pressure or severe water problems and...

Stress strain relationships in rocks

Jun 25 2015 0183 32 Increasing confining pressure P c alone will result in a decrease of rock volume or compactionIn contrast increasing the pore pressure P p tends to increase rock volumeP p counteracts the effects of P cThus rock properties are controlled largely by the difference between P c and P p or the differential pressure P dA more exact form will account for the interaction of the fluid...

Rock Strength

Rock strength and porosity have good correlations for various rocks and porosity can be obtained from lab tests or from density and sonic logs In the following equations the rock strength UCS is in MPa and porosity is in percent For shales in the North Sea geologically young and weak shales mostly high-porosity Tertiary shales Horsrud 2001 proposed the following correlations for...

PDF Effect of elastic and strength properties of rocks

In this context the effect of elastic and strength properties of rocks on the drilling properties was examined and also the influence of the brittleness and drillability on the mechanical...

Influence of rock falls rock strength and joint

Rock strength is based on the spacing width and orientation of joints Joint spacing will influence the size of the debris that will fall from the wall Larger boulders fall less frequently require more force to be moved and tend to occur when joints are widely spaced...

Weathering of Rocks 5 Factors Geology

ADVERTISEMENTS This article throws light upon the five main factors which influence the rate of weathering of rocks The factors are - 1 Climate 2 Particle Size 3 Exposure 4 Mineral Composition 5 Time Factor 1 Climate This is the most important factor affecting weathering of rocks The extent of weathering is dependent on the...

Which is not a major factor that influences the strength

Which is not a major factor that influences the strength of rock Questions in other subjects Mathematics 31122019 00 31 Acarpenter wants to build a rectangular box with square sides in which to put round things the material for the bottom costs 20/ft 2 material for...

Influence of Rock Strength on the Propagation of Slotted

When rock strength rises the propagation length velocity and duration of the primary crack and the concentration degree of effective stress in the slotted direction will all increase in the sandstone and granite but there is an opposite influence trend of rock strength in...

Rock mass properties

Influence of sample size The influence of sample size upon rock strength has been widely discussed in geotechnical literature and it is generally assumed that there is a significant reduction in strength with increasing sample size Based upon an analysis of published data Hoek and Brown 1980a have suggested that the uniaxial compressive...

Section 1 Rock Deformation

the force is removed Once the elastic limit or strength of a rock is surpassed it either flows or fractur The 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...

Influence of rock mass properties on TBM penetration rate

were carried out and the influence of each rock mass properties on the PR was determined individually The relationship between BTS of rock and PR of TBM has a very poor correlation coefficient r of 011 as shown in Figure 10 The relationship between UCS of intact rock and PR of TBM has a correlation coefficient 043 as shown in Figure 11...

Influence of Ground Temperature on Shotcrete

Similarly Cui et al discussed the influence law and mechanism of sprayed concrete and rock bonding performance under dry heat conditions and pointed out that compared with the standard curing condition of 20 176 C the adhesion strength between shotcrete and rock under the condition of dry heat curing will be seriously reversed and even the...

Estimating Rock Mass Strength

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...

The influence of rock mass strength on glacial valley

Paul C Augustinus Glacial valley cross-profile development the influence of in situ rock stress and rock mass strength with examples from the Southern Alps New Zealand Geomorphology 101016/0169-555X 95 00050-X 14 2 87-97 1995...

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 plan 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...

List the factors that influence the strength of a rock

There are four factors that influence the strength of a rock These factors are time pressure the type of rock and temperature...

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

strength of soft rock materials is much lower than that of hard rock materials so the conversion factor should certainly be different This paper aims to evaluate the uniaxial compressive strength the influence of some physical characteristics on the strength of soft rock materials and the correlation...

what is a major factor that influences the strength of a rock

Apr 19 2009 0183 32 what is a major factor that influences the strength of a rock I need to know this for my extra credit assignment so please help me -greatly appreciated Answer Save 2 Answers Relevance AndrewG Lv 7 1 decade ago Favorite Answer 1 mineral makeup of the rock rocks containing a lot of silica are generally a lot stronger than rocks...

crust deformation and mountain building Flashcards Quizlet

What are the four factors that influence the strength of a rock and how it will deform temperature pressure rock type and time What two ways do rocks deform permanently brittle and ductile What is the fracturing of an object once its strength is exceeded cooler rock near the surface of the crust...

Influence of water content on the strength of rock

Mar 30 2006 0183 32 Hawkins and McConnell 1992 investigated the influence of the water content on the strength and deformability of 35 different British sandstones from 21 localities ranging in age from Pre-Cambrian to Cretaceous They published values for the measured uniaxial compressive strength and for the tangent and secant deformation moduli in the case of dry and fully saturated conditions...

Rock Deformation Causes and Types

The ability of a rock to handle stress depends on its elasticity or the flexibility of the rock You might be surprised to learn that rocks are flexible Under the right conditions they can...

Influence of water content on the strength of rock

Rock Strength - an overview ScienceDirect Topics...

Some influences of rock strength and strain rate on

Studies have shown that rock strength is a controlling factor in the mobility of rock avalanches - that is mass movements involving lower strength rock are generally found to produce greater mobility as evidenced by the spread of deposits or low farboschung angle However there are conflicting ideas as to how and why this influence is manifested...

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 sampl 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...

Influences of Loading Condition and Rock Strength to the

Mar 10 2015 0183 32 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 90 176 pure shear...

Charlie Chunlin Li

International Journal of Rock Mechanics And Mining Scienc vol 87 Chen Yu Li Charlie Chunlin 2015 Influences of Loading Condition and Rock Strength to the Performance of Rock Bolts Geotechnical Testing Journal vol 38 2...

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