relation between rock quality designation and crushing strength

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Estimation of optimum specific energy based on rock ... -… pdf

specific energy and the mechanical rock properties. The strongest relationships are found by using uniaxial compressive strength and tensile strength. The performance ... of these models depend on the quality and amount of the data. It is usually ..... between 10 to 100 MPa, rock quality designation (RQD) and cutterhead...

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UNIVERSITI TEKNOLOGI MALAYSIA - Faculty of Civil… pdf

to the properties of the rock mass, which include Rock Quality Designation (RQD) ... A good correlation exists between RQD and in-situ deformation modulus .... 4.2.1 Correlation between index and direct strength. 67. 4.2.2 Correlation between tensile and compressive strength. 69. 4.2.3 RQD based on primary wave...

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Estimating the Strength of Jointed Rock Masses -… pdf

7 Jun 2011 ... versus (RQD) relationship. Some findings derived from the comparisons based on different approaches are very important and are worthy of further discussion to enhance our understanding of the strength of jointed rock masses. 2 Comments on New Relation Between Uniaxial. Compressive Strength and...

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Rock Mass Classification - SlideShare

22 Dec 2013 ... Parameters of RMR: Six parameters are used to classify a rock mass using the RMR system: Uniaxial compressive strength of rock material Rock Quality Designation (RQD) Spacing of discontinuities Condition of discontinuities Groundwater conditions Orientation of discontinuities; 10. Each of...

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8. Rock mass pdf

RQD. −. = Relationship between RQD and discontinuity density. Upper: Priest & Hudson. (1981). Lower: ISRM (1978) where λ is discontinuity density (m-1) or an .... strength. Cohesion and friction angle is said to be 0~7 MPa and 27. ~35°, respectively (Yamaguchi and Nishimatsu, 1991). Tensile strength of discontinuity is...

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Correlations Between Index Properties and Unconfined… pdf

Farah, Raoaa, "Correlations Between Index Properties and Unconfined Compressive Strength of Weathered Ocala Limestone" (2011). UNF Theses ..... Relationship between unconfined compressive strength and point load strength ..... conclusion drawn from this study are that the rock quality designation (RQD) decreases.

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Nkpadobi - Portal de Revistas UN

Keywords: Weathering, Uniaxial Compressive Strength, Slope stability, Rock Quality Designation, Rock Mass Rating, Slope Mass Rating. .... According to Deere (1968) relationship between RQD and the engineering quality of rock mass, the RQD values determined in this work range from 34.5% to 90% covering a broad...

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CHARACTERIZATION OF GEOLOGIC MATERIALS pdf

Specific Gravity, Absorption, and Unit Weight. 3.1.2. Rock Strength. 3.1.3. Elastic Properties. 3.1.4. Durability. 3.2. Engineering Classification of Intact Rock. 3.3. Rock Mass Properties. 3.4. Engineering Classification of Rock Mass. 3.4.1. Percent Core Recovery. 3.4.2. Rock Quality Designation (RQD). 3.4.3. Fracture Index.

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Rock Mass Rating pdf

Uniaxial compressive strength of rock material. Rock Quality ... mines-me. Table Item Value Rating. 4.1: A.l Point load index 8 MPa 12. 4.1: A2 RQD 70% 13. 4. I: A.3 Spacing of discontinuities 300 mm 10. 4.1: EA Condition of discontinuities Note 1 22. 4. .... boundary between the 'Fair rock' and 'Good rock' categories. In the.

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Determination and applications of rock quality…

1 Jun 2016 ... Since in many cases rock quality designation (RQD) is the only rock mass classification index available, this paper outlines the key aspects on determination of RQD and evaluates the empirical methods based on RQD for determining the deformation modulus and unconfined compressive strength of rock...

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Determination and applications of rock quality…

Then, the empirical methods based on RQD for determining the deformation modulus and unconfined compressive strength of rock masses are briefly reviewed. .... For example, for a negative exponential distribution of discontinuity spacings, Priest and Hudson (1976) derived the following relationship between RQD and...

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RQD: Time to Rest in Peace - Pells Consulting pdf

Unconfined Compressive Strength. Q. Norwegian rock mass ... Deere and co-workers devised an index, Rock Quality Designation (RQD), to differentiate between relatively good quality rock and .... In addition the process may lead the geologist or engineer to adopt a relationship between RQD and volumetric joint spacing...

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correlation rqd – volumetric joint count -… pdf

any reliable correlation between RQD and other block size measurements. An adjusted ... Keywords: Block size measurement, RQD, rock mass jointing, jointing correlations, volumetric joint count. Contents: .... effects in rock engineering can be explained by this feature, including compression strength, deformation modulus...

Evaluation of Ground Bearing Capacity Estimation ... -… pdf

not fall immediately but is reduced gradually in time as is in triaxial compressive strength test because ... regression analyses, relations with acceptable correlation (r = 0.64 - 0.82) between measured and ... a qu - Ultimate bearing capacity, kg/cm2 ; RQD-Rock quality designation, % ; Vp1- Seismic velocity (P-Wave),.

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Estimating Hoek-Brown Rock Mass Strength… pdf

for intact rock). The Barton et al. Q-index can also be used according to Bieniawski through a relationship between RMR and Q. The use of the complete quantitative rating or index from ... constants, and uniaxial compressive strength of the intact rock. .... Year Strength RQD Spacing Condition Groundwater Comment. 1973.

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Simple Correlations between Rock Abrasion and Other…

It is imperative to determine such properties of uniaxial compression strength (UCS), rock quality designation (RQD) and hardness for rock engineering to help ... The paper also introduces recommendations for future rock abrasion techniques and discusses the use of these correlations exhibiting strong relationships...

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1 Rock mass classification - Rocscience pdf

The Rock Quality Designation index (RQD) was developed by Deere (Deere et al 1967) to provide a ... The suggested relationship for clay-free rock masses .... material. Point-load strength index. >10 MPa. 4 - 10 MPa. 2 - 4 MPa. 1 - 2 MPa. For this low range - uniaxial compressive test is preferred. 1. Uniaxial comp. strength.

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Mining Rock Mass Rating - EduMine

Strength Index, > 10 MPa, 4 - 10 MPa, 2 - 4 MPa, 1 - 2 MPa, For this low range - uniaxial compressive test is preferred. Uniaxial Compressive Strength, > 250 MPa, 100 - 250 MPa, 50 - 100 MPa, 25 - 50 MPa, 5 - 25 MPa, 1 - 5 MPa, < 1 MPa. Rating JA1, 15, 12, 7, 4, 2, 1, 0. TOP. A2. Drill Core Quality - RQD ( see RQD ), 90%...

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Rock mass rating - Wikipedia

The Rock Mass Rating(RMR) System is a geomechanical classification system for rocks, developed by Z. T. Bieniawski [1] between 1972 and 1973. It combines the most significant geologic parameters of influence and represents them with one overall comprehensive index of rock mass quality, which is used for the design...

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RQD Slope stability classification Weathering -… pdf

17 May 2011 ... RQD. Slope stability classification. Weathering. Duluth, Minnesota, USA, 17 May 2011. Robert Hack. Engineering Geology, ESA, Faculty of Geoinformation .... discontinu and face slope between relation for factor. = angle dipity discontinu for factor. = face slope and ities discontinu of strikes theof m parallelis.

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the connection between rock wall raveling and in situ… pdf

conditions found on site. In order to define interactions between the specific geological conditions and the different environmental acting factors the following parameters are used commonly: intact rock strength, rock mass quality indicators such as RQD (Rock Quality. Designation), joint distance and groundwater condition,...

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Prediction of penetration rate of rotary-percussive drilling… pdf

16 Aug 2011 ... uni-axial compressive strength, Brazilian tensile strength, porosity, Mohs hardness, Young modulus, ... that there is a strong correlation between penetration rate and RQD, rotation and blasthole diameter. .... developed a relationship between penetration rate and percussive drilling (Pandey et al., 1991).

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Geostatistical Evaluation of Rock-Quality… pdf

knowledge, at different scales, of the rock-mass strength is required in order to adequately size the retaining walls and ... The objective of this paper is to study this relation, together with one of the features common to both ... RQD depends on the angle between the sample direction and the fracture; the primary reason is.

Application of rock mass classification systems as a tool… pdf

The main difference between these two systems lies in the adjustments that are undertaken in the MRMR system, which is the ... RMR. MRMR. Q. GSI. Parameters Uniaxial compressive strength (UCS). UCS. Discontinuity conditions. RQD. RQD. RQD. Structure/interlocking of rock blocks. Joint spacing Joint spacing Joint...

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engineering classification and index properties for intact… pdf

RELATIONSHIP BET1W,'EEN ABRASION HA•DDNESS AND ULTIMATE. COMPRESSIVE ST'ENGTH FOR ROCK IN UNIAXIAL CONPRESSXON. 26. 3.5. RELATIONSHIP BETWEEN SHCRE HARDNESS P.ND ULTIt,1ATE. COMPRESSIVE STRENGTH FOR ROCK IN UNIAXIAL CONIPRESSION. 28. 3.6. RELATIONSHIP...

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chapter 6 rock mass properties and classifications -… pdf

Attempts have been made to link Rock Load Factor classification to RQD. ... Figure 6.1.3b Relationship between active span and stand-up time and rock mass .... Strength of intact rock material. Uniaxial compressive strength (MPa). > 250. 100 − 250 50 − 100 25 − 50. 5 − 25. 1 − 5. < 1. Rating. 15. 12. 7. 4. 2. 1. 0. 2. RQD (%).

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RQD & UCS Correlation | Strength Of…

There are several empirical relations between the rock mass mechanical parameters (unconfined compressive strength. moderately weathered. Table 1: Description of rocks according to RQD No 1 2 3 4 5 RQD (%) 25 25 – 50 50 – 75 75 – 90 90 – 100 Rock quality Very poor Poor Fair Good Excellent This study was...

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(RQD) in Determining Strength of the Rock -… pdf

Abstract:- The rock quality designation (RQD) is a commonly used index for the description of rock mass fractured ... is the ratio (percentage) of intact core pieces longer than 10 cm over the total drilling length. ... between 40% and 60%) are less frequently encountered, due to the customarily and universally adopted, but.

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Evaluation of rock mass strength criteria - DiVA… pdf

that the uniaxial compressive strength, block size and shape, joint strength, and a scale factor are the most ... The case study revealed that the rock mass quality (Q-system), rock mass Number (N- system), Rock Mass ...... The relationship between the numerical value of RQD and the engineering quality of the rock mass as...

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RQD - Journal of Rock Mechanics and Geotechnical… pdf

9 Mar 2016 ... methods based on RQD for determining the deformation modulus and unconfined compressive strength of rock masses are briefly ... to the lower bound (conservative) and unconfined compressive strength values in the middle of the .... (1976) derived the following relationship between RQD and linear.

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Correlation of sandstone rock properties… pdf

unconfined compressive strength due to variation of (RQD). Many field ... Keyword: Sandstone, unconfined compression strength, RQD, tests, jointing, fracture. 1. .... strength (Qu). In this study, the relations between these previous parameters and their effects on unconfined compressive strength (Qu) have been presented.

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"Rock Quality Designation (RQD) After… pdf

Twenty years of experience is now available in the use of the Rock Quality Designation (RQD) in practice. The RQD is an index of rock quality in which a modified core recovery per centage is obtained by counting only pieces of sound core 4-in. (100 mm) or greater in length of NX size or larger core diameters. Experience...

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the characterization of rock for civil engineering ... -… pdf

could provide a rock quality classification for engineering application. What is required is the equivalent ... (b) rock texture, wich is the mutual relationships between the individual mineral components. Identification of ..... related to the degree of decomposition or the resulting compressive strength of the rock material, and the...

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Prediction of Side Resistance in Poor Quality… pdf

side resistance in poor quality rock, presents the comparison of RQD versus GSI ... unconfined compression strength testing in accordance with ASTM D7012. ... Rock Quality. 90 to 100. Excellent. 75 to 90. Good. 50 to 75. Fair. 25 to 50. Poor. 0 to 25. Very Poor. Table 1. Correlation between RQD and Rock. Quality (after...

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chapter 4 field identification and in-situ testing -… pdf

The dry strength/breaking test is normally made on a dry pat of soil about one-half inch thick and ... mode and extent of lithification and relationship between grains. ..... Relationship between RQD (Rock Quality Designation) and Rock Quality (from Deere,. 1969). Table 2.8 Description of RQD. RQD%. Rock Quality. 0 - 25%.

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dspace cover page - Research Collection pdf

The Rock Quality Designation of Deere et al. (1967). 17. 2.5.1. Advantages of the RQD. 18. 2.5.2. Limits of the RQD. 18. 2.5.3. Possible sources of error in evaluating the RQD. 18. 2.5.4. Correlation between RQD and jointing. 21. 2.6. ... Correlation between PLT, petrography, and uniaxial compressive strength. 61. 2.15.5.

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Core Index, A Numerical Core-Logging Procedure for Estimating… pdf

Core Index, A Numerical. Core-Logging Procedure for. Estimating Rock Quality. By John R. Ege. U.S.GEOLOGICAL SURVEY CIRCULAR 954. Procedures to be followed for rapid characterization of rock quality. 1987...

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Strategy for a Rock Mechanics Site Descriptive… pdf

named RMR based on five parameters, strength of the intact rock, RQD (Rock Quality ... given as the uniaxial compressive strength, can be evaluated from the rating systems by empirical relations. For determination of the rock mass strength, ... Correlation between the in-situ deformation modulus of the rock mass and the.

Establishing Relationships between Some Engineering… pdf

The Rock Quality Designations (RQD); Uniaxial Compressive Strength (UCS); and. Aggregate Crushing Value (ACV) of the rocks were determined both in the laboratory and on the field using international standard procedures. Subsequently, relationships were established between the determined rock strength parameters.

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Estimating the Strength of Jointed Rock Masses -… pdf

14 Aug 2009 ... many cases, rock quality designation (RQD) is the only ... strength in practice. Keywords Rock mass strength Á. Rock mass classification Á RQD Á Empirical methods. 1 Introduction. Reliable estimation of the strength and deformation prop- .... between unconfined compressive strength ratio rcm/rc and.

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