Quantitative Classification of Rock Mass IIT Kanpur

Overall rock mass quality on the basis of A and B combined b Joint condition good fair poor c Amount of water inflow in gallons per minute per 1000 feet of tunnel feet of tunnel RMR or Geomechanics Cl ifi i Classification Guideline properties of Rock Mass Classes Evaluation of Tunnels bd RMR Example 10 m span RMR 80 based on RMR Stand up time gt 4

Mining rock mass rating Wikipedia

RMR Laubschers Rock Mass Rating IRS Intact Rock Strength RQD Rock Quality Designation spacing expression for the spacing of discontinuities condition condition of discontinuities parameter also dependent on groundwater presence pressure or quantity of groundwater inflow in the underground excavation MRMR RMR adjustment factors in

Rock Mass Classification SlideShare

22 12 2013 nbsp 0183 32 Rock Mass Rating RMR The Rock Mass Rating RMR system is a geomechanical classification system for rocks developed by Z T Bieniawski between 1972 and 1973 7

Study of Rock Mass Rating RMR and Geological Strength Index

The Rock Mass Rating RMR classification system was developed by Bieniawski 10 in 1973 and after several modifications the 1989 version is the most used in rock engineer ing practice 19 This classification system has been refined over several years and its characterization method has been revised from its creation onward

Geomechanics Classification Rock Mass Rating RMR 123

Geomechanics classification Rock Mass Rating RMR is the most widely used rock mass classification given by Z T Bieniawski between 1972 and 1973 It is based upon six parameters out of which five are universal and the sixth one is used specifically for different applications Prediction of RMR by the use of fuzzy logic makes it easier to predict the rating of rock more

Rock Mass Rating RMR Geomechanics Classification

05 02 2017 nbsp 0183 32 Bieniawski 1976 published the details of a rock mass classification called the Geomechanics Classification or the Rock Mass Rating RMR system Over the years this system has been successively refined as more case

Rock slope stability analysis along the national highway 6 using

rock mass rating RMR technique given by Bieniawski 1979 1989 RMR technique is based on both field and laboratory study which includes uniaxial compressive strength of the rock rock quality designation RQD discontinuity spacing discontinuity condition and groundwater condition The Rock Mass Rating System is presented in Table 3 giving the ratings for each

Correlation between RMR and SMR Based on Field Data A Case

Rock Mass Rating RMR system Over the years this system has been successively refined as more case records have been examined and the reader should be aware that Bieniawski has made significant changes in the ratings assigned to different parameters The discussion which follows is based upon the 1989 version of the classification Bieniawski 1989 Both this

PDF Review of rock mass rating classification Historical

This is determined by the rock mass rating RMR and thus a geological survey is imperative to locate the best site for the cavern 56 57 The last panel in Fig 3b correlates the RMR method

The RMR Rock Mass Rating system

Short on the RMR Rock Mass Rating system This engineering classification system which was developed by Bieniawski in 1973 utilises the following six rock mass parameters 1 Uniaxial compressive strength of intact rock material 2 Rock quality designation RQD 3 Spacing of discontinuities 4 Condition of discontinuities given as

Improved RMR Rock Mass Classification Using Artificial

29 11 2012 nbsp 0183 32 Rock mass classification systems such as rock mass rating RMR are very reliable means to provide information about the quality of rocks surrounding a structure as well as to propose suitable support systems for unstable regions Many correlations have been proposed to relate measured quantities such as wave velocity to rock mass classification systems to

Guideline for Rock Mass Classification System

The empirical method of Rock Mass Rating RMR Q system is often utilised for the rock mass classification of tunnel projects The proposed system includes visual judgement of the rock material and rock mass with a relatively wide range of definition contrary to the RMR or Q system One of the empirical methods of Geological Strength Index GSI also includes similar

The MRMR Rock Mass Rating Classification System in Mining Practice

The in situ rock mass rating system – IRMR leading to the mining rock mass rating system MRMR for jointed rock masses has been used and abused in mining operations around the world for the past 27 years Despite the recent development of elaborate design procedures and computer aided design packages MRMR remains one of the most versatile and practical mine

INPUT PARAMETERS TO RMR1989 from Bieniawski 1989

1 Very good rock RMR 81 100 Full face 3m advance Generally no support required except for occasional spot bolting 2 Good rock RMR 61 80 Full face 1 0 1 5m advance Complete support 20m from face Locally bolts in crown 3m long spaced 2 5m with occasional wire mesh 50mm in crown where required None 3 Fair rock RMR 41 60

Empirical Evaluation of Rock Mass Rating and Tunneling Quality

Among these several rock mass classification systems rock mass rating RMR and tunneling quality index Q are internationally accepted systems for support design that are widely used in the field of tunneling 2–4 The RMR classification was proposed in 1973 as a jointed rock classification system 5 It was refined several times and major revisions in its

93896584 Metode Rock Mass Rating ilham charisma

Rock Mass Rating RMR 6 Q system 1 Metode klasifikasi beban batuan rock load Metode ini diperkenalkan oleh Karl von Terzaghi pada tahun 1946 Merupakan metode pertama yang cukup rasional yang mengevaluasi beban batuan untuk desain terowongan dengan penyangga baja Metode ini telah dipakai secara berhasil di Amerika selama kurun waktu 50 tahun Akan tetapi

CHAPTER 6 ROCK MASS PROPERTIES AND CLASSIFICATIONS

The rock mass rating RMR system is a rock mass quality classification developed by South African Council for Scientific and Industrial Research CSIR close associated with excavation for the

PDF Rock Mass Classification Systems ResearchGate

1 7 5 Rock Mass Rating RMR System The RMR system or the Geomechanics Classification was developed by Bieniawski during 1 972 1973 in South Africa to assess the stability and support requirements of

Directional rock mass rating DRMR for anisotropic rock mass

01 04 2021 nbsp 0183 32 RMR has been used as a basis for developing many other rock mass classification systems such as Mining Rock Mass Rating MRMR Laubscher 1990 IRMR Jakubec and Laubscher 2000 CMRI RMR CMRI 1987 Venkateswarlu et al 1989 Surface Rock Classification SRC Gonzalez de Vallejo 1983 1985 2003 slope mass rating SMR

Stand up time in tunnel base on rock mass rating Bieniawski

14 11 2017 nbsp 0183 32 RMR Rock Mass Rating or also known as the geo mechanics classification has been modified and made as the International Standard in determination of rock mass weighting Rock Mass Rating Classification has been developed by Bieniawski since 1973 1976 and 1989 The goals of this research are investigate the class of rocks base on classification rock

PDF Review of rock mass rating classification Historical

For example the RMR method divides the rock mass into five grades i e grades I ∼IV of which the grade I denotes the rock mass with the highest quality while the grade V represents the rock

Rock Mass Rating RMR Geomechanics Classification

05 02 2017 nbsp 0183 32 Bieniawski 1976 published the details of a rock mass classification called the Geomechanics Classification or the Rock Mass Rating RMR system Over the years this system has been successively refined as more case records have been examined and Bieniawski has made significant changes in the ratings assigned to different parameters The following

PDF The RMR Rock Mass Rating system Mitterand K A L A L

The RMR Rock Mass Rating system 1 Short on the RMR Rock Mass Rating system This engineering classification system which was developed by Bieniawski in 1973 utilises the following six rock mass parameters 1 Uniaxial compressive strength of intact rock material 2

Engineering Rock mass rating HandWiki

The Rock Mass Rating RMR System is a geomechanical classification system for rocks developed by Z T Bieniawski 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 and construction of excavations in rock such as tunnels

Chapter 6 Rock Mass Classification Part 2 pdf ROCK MASS

Rock Mass Rating RMR cont d Spacing of Discontinuities Spacing within a joint set If several sets use the lowest set rating Use chart to find corresponding rating Condition of Discontinuities Qualitative assessment of joint condition Use chart to find corresponding rating Table 3 Spacing of discontinuities Bieniawski 1979 Description Spacing m Rating Very

Review of rock mass rating classification Historical developments

Historical development of the rock mass rating RMR system first developed and later reviewed by Bieniawski and contributed by other researchers is presented The advanced version of RMR classification and the scope of its application are specified

Table 4 Rock Mass Rating System After Bieniawski 1989

Rock mass classification 9 Table4 Rock Mass Rating System After Bieniawski 1989 A CLASSIFICATION PARAMETERS AND THEIR RATINGS Parameter Range of values Point load strength index gt 10 MPa 4 10 MPa 2 4 MPa 1 2 MPa For this low range uniaxial compressive test is preferred 1 Strength of intact rock material Uniaxial comp strength gt 250 MPa 100

IS 13365 1 1998 Quantitative classification system of rock mass

RMR 4 1 The rock mass rating should bedetermined as an algebraic sum of ratings for all the parameters given in Items I to VI after adjustments for orientation ofdiscontinuities given in item vn of Annex B The sum ofItems II to V is called Rock Condition Rating RCR which discounts the effect ofcompressive strength of intact rock material and orientation of joints This is also

Rock Mass Classification Rock Mass System

15 12 2016 nbsp 0183 32 The Rock Mass System referred to as RMR provided an overall rating of the rock mass ranging from less than 20 for very poor rock to 100 for very good rock Every rating is associated with a class of rock – class I for a very good rock and class V for a very poor rock The overall rating is obtained by adding up the scored pertaining to 6 different criteria These

The MRMR Rock Mass Rating Classification System in Mining Practice

In order to avoid confusion with the Bieniawski RMR the term IRMR is now used to indicate the rating of the in situ rock mass These changes were proposed as a direct result of the increased use of the classification system in the mining industry and are based on practical experiences in mines worldwide The following case study is to illustrate the necessity of the different