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Rock Mechanics In Mining Oprojects

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    Rock Mechanics In Mining Oprojects

    I will go through rock mechanics in topics and the first is

    RQD

    The RQD is defined as the cumulative length of core pieces longer than 10cm in a run divided by the total length of the core run. The total length of core must include all lost core sections. Any mechanical breaks cause by the drilling process or in extracting the core from the core barrel should be ignored. Core discing due to high stress should not be considered in the RQD calculation but noted separately in core logs. RQD should be measured as soon as possible after drilling.

    Sum of lengths of core sticks > 10 cm long x 100

    Total length of core run




    Table 1. Rock Mass Classification Based on RQD

    RQD
    Rock Quality Classification

    <25%
    Very Poor

    25-50%
    Poor

    50-75%
    Fair

    75-90%
    Good

    90-100%
    Excellent

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    السلام عليكم
    انا طالب ابحث عن هذا الكتاب
    introduction to Rock Mechanics, 2nd Edition,
    Goodman, R.E., John Wiley and Sons

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    rock mechanics book

    Introduction to Rock Mechanics, 2nd Edition


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    Introduction to Rock Mechanics, 2nd Edition
    Richard E. Goodman
    ISBN: 978-0-471-81200-5
    Paperback
    576 pages
    November 1988


    £74.50 / €107.20 Add to Cart This price is valid for Saudi Arabia. Change location to view local pricing and availability.


    Evaluation Copy


    Instructors may request an evaluation copy for this title.



    Introduces a new approach to rock mechanics called ``block theory,'' which formalizes procedures for selecting proper shapes and orientations for excavations in hard jointed rock. Applies block theory to rock slopes and underground excavations, and covers the Q theory of rock classification, the empirical criterion of joint shear strength, rock bolting, properties of weak rocks, statistical frequency of jointing, an empirical criterion of rock strength, and design of underground supports. Contains many new problems with worked-out solutions.

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    السلام عليكم
    شكرا لكني ابحث عن format pdf لتحميل مباشرة .
    introduction to Rock Mechanics, 2nd Edition, Goodman, R.E., John Wiley and Sons[/QUOTE]

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    Arrow

    1. الكتب رائعة بس ياريت كتاب فى هندسة المناجم

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    السلام عليكم ورحمة الله وبركاته ابحث علي دورات في كيفية اخز البيانات لل rock mass classification في الحقل اما فيدوهات او كتابه

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    The first major Rock mass classification system in geotechnical engineering was proposed about 60 years ago for tunnelling with steel supports. Later classification systems were developed for non-steel support underground excavation, slope and foundation engineering
    Design methods
    Considering the three main design approaches for excavation in rock – analytical, observational and empirical – the most predominant design approach is the empirical design method. Indeed, on many underground or surface construction and mining projects, rock mass classifications have been providing the only systematic design aid in an otherwise haphazard "trial-and-error" procedure
    Objectives
    Rock mass classifications were developed to create some order out of the chaos in site investigation procedures. They were not intended to replace analytical studies, field observations, measurements or engineering judgement.
    The objectives of rock mass classifications are to:
    1. Identify the most significant parameters influencing the behaviour of a rock mass.
    2. Divide a particular rock mass formulation into groups of similar behaviour – rock mass classes of varying quality.
    3. Provide a basis of understanding the characteristics of each rock mass class
    4. Relate the experience of rock conditions at one site to the conditions and experience encountered at others
    5. Derive quantitative data and guidelines for engineering design
    6. Provide common basis for communication between engineers and geologists
    Benefits
    The main benefits of rock mass classifications:
    1. Improving the quality of site investigations by calling for the minimum input data as classification parameters.
    2. Providing quantitative information for design purposes.
    3. Enabling better engineering judgement and more effective communication on a project
    List of rock mass classifications
    Rock quality designation
    rock-quality designation (RQD) Rough measure of the degree of jointing or fracture in a rock mass, measured as a percentage of the drill core in lengths of 10 cm or more. High-quality rock has an RQD of more than 75%, low quality of less than 50%. Rock quality designation (RQD) has several definitions. The most widely used definition was developed in 1964 by D. U. Deere. It is the borehole core recovery percentage incorporating only pieces of solid core that are longer than 100 mm in length measured along the centerline of the core. In this respect pieces of core that are not hard and sound should not be counted though they are 100 mm in length. RQD was originally introduced for use with core diameters of 54.7 mm (NX-size core). RQD has considerable value in estimating support of rock tunnels. RQD forms a basic element in some of the most used rock mass classification systems: Rock Mass Rating system (RMR) and Q-system
    RQD is defined as the quotient:
    % = Sum of length of core sticks longer than 100 mm measured along the center line of the core = Total length of core run[ Classification table

    From the RQD index the rock mass can be classified as follows:
    RQDRock mass quality<25%very poor25-50%poor50-75%fair75-90%good90-100%excellent
    RQDRock mass quality<25%very poor25-50%poor50-75%fair75-90%good90-100%excellent

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    Rock mass rating system
    The Rock Mass Rating (RMR) system is a geomechanical classification system for rocks, developed by Z. T. Bieniawski between 1972 and 1973.
    [ Definition

    The following six parameters are used to classify a rock mass using the RMR system
    1. Uniaxial compressive strength of rock material
    2. Rock Quality Designation (RQD)
    3. Spacing of discontinuities
    4. Condition of discontinuities
    5. Groundwater conditions
    6. Orientation of discontinuities
    Each of the six parameters is assigned a value corresponding to the characteristics of the rock. These values are derived from field surveys. The sum of the six parameters is the "RMR value", which lies between 0 and 100.
    [ Classification table

    Below is the classification table for the RMR system.
    RMRRock quality0 - 20Very poor21 - 40Poor41 - 60Fair61 - 80Good81 - 100Very good
    [ Applications

    Rock Mass Rating has found wide application in various types of engineering projects such as tunnels, slopes, foundations, and mines. It is also adaptable for knowledge-based expert systems
    Q-system
    For the linguistics formalism, see Q-systems.The Q-system of rock mass classification was developed in Norway in 1974 by Nick Barton, Lien, R., and Lunde, J at NGI (Norwegian Geotechnical Institute). The system was developed on the basis of an analysis of 212 tunnel case histories from Scandinavia. It is a quantitative classification system and is an engineering system facilitating the design of tunnel supports. The Q-system uses six different parameters to assess the rock mass quality. The parameters are:
    • Rock Quality Designation RQD
    • Joint set number Jn
    • Roughness of the most unfavorable joint or discontinuity Jr
    • Degree of alteration of filling along the weakest joint Ja
    • Water inflow Jw
    • Stress Reduction Factor SRF
    The Q-factor can then be calculated as:

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