• Use Of Ultrasonic Velocity Travel Time To Estimate

    Use Of Ultrasonic Velocity Travel Time To Estimate

    data set the correlation between UCS and ultrasonic velocity travel time was expressed as UCS 217.2 e-0.016tp for granite and UCS 1110.6 e-0.037tp for schist and the coefficient of determination R2 value for both granite and schist is 0.93. These correlations may be useful for applications related to geotechnical engineering designs.

  • Bearing Capacity Of Rocks Iit Kanpur

    Bearing Capacity Of Rocks Iit Kanpur

    In case of rock mass with favorable discontinuities the net allowable bearing pressure may be estimated from q a q c N j Where qWhere q c average uniaxial compressive strength of rock coresaverage uniaxial compressive strength of rock cores N j empirical coefficient depending on the spacing of the discontinuities 3SB 10 1300S thickness of discontinuity thickness of .

  • Determination And Estimation Of Uniaxial Compressive

    Determination And Estimation Of Uniaxial Compressive

    Uniaxial Compressive Strength UCS of rocks is an important mechanical parameter for many civil engineering and rock engineering applications such as tunnel

  • Ultimate Bond Strength Of Anchors In Rock Geotechpedia

    Ultimate Bond Strength Of Anchors In Rock Geotechpedia

    At the low end of the rock competence scale UCS int 15MPa and GSI generally 30 discontinuities play less of a role and rockmass strength tends to matrix strength. This means that rockmass properties estimated based on the Hoek-Brown criterion as modified by Carter et al. are considered to be more representative and in general will lead .

  • Lecture 9 Introduction To Rock Strength David Hart

    Lecture 9 Introduction To Rock Strength David Hart

    It has been established that rock fails in compression by shearing along a failure plane oriented at an angle . . with respect to . . 1. that is specific for a particular rock. The M-C linear strength criterion implies that . . stays the same regardless of the confining pressure applied. Rock

  • Chapter 4 Engineering Classification Of Rock Materials

    Chapter 4 Engineering Classification Of Rock Materials

    properties however 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 a rock mass therefore reduce its strength and stability and reduce the energy required to excavate or erode it.

  • Rock Mass Properties Rocscience Inc

    Rock Mass Properties Rocscience Inc

    For the intact rock pieces that make up the rock mass equation 1 simplifies to 0.5 3 1 3 1 ci ci m i 5 The relationship between the principal stresses at failure for a given rock is defined by two constants the uniaxial compressive strength and a constant . Wherever

  • Statistical Models For Estimating The Uniaxial Compressive

    Statistical Models For Estimating The Uniaxial Compressive

    tween UCS and IHI values and showed that the standard indentation test is important for dening the rocks mechanical properties. He also stated that the index value could be used as an independent method for clas-sifying rock hardness and evaluating rock strength. Tercan and Ozcelik Corresponding author. E-mail address ateymenohu.edu.tr.

  • Aiv The Aggregate Impact Value Indicates The Strength

    Aiv The Aggregate Impact Value Indicates The Strength

    37 Summary of material characteristics and properties for volcanic rocks 38 Typically fresh granite Grade I is very strong to extremely strong with uniaxial compressive strength UCS about 200 MPa.Grade II granite slightly decomposed is very strong with UCS about 100 to 150 MPa.Grade III granite moderately decomposed is moderately weak to strong with UCS about 10 to 80 MPa.

  • Correlation Between The Point Load Index Is50 And The

    Correlation Between The Point Load Index Is50 And The

    Unconfined compression strength is one of the most important engineering parameters in rock mechanics it is used to characterize and study the behavior of solid rocks. A good correlation between the unconfined compression strength test UCS and the point load strength PLS can be very useful because it allows for faster and cheaper

  • Petrography And Physicomechanical Properties Of Rocks

    Petrography And Physicomechanical Properties Of Rocks

    The alkali granite with medium- to fine-grained phenocrysts is stronger UCS 35.84939.622 MPa than the alkali granite with very coarse-grained phenocrysts UCS 27.67230.817 MPa. However the UCS of alkali quartz syenite is the highest 47.169-45.911 MPa although its average phenocrysts size is comparable to that of the very .

  • Correlation Between Uniaxial Compressive

    Correlation Between Uniaxial Compressive

    4.1 Correlation for limestone between UCS and Is 50 43 4.2 Correlation for granite between UCS and Is 50 44. xii LIST OF SYMBOLS kN - Kilo Newton mm - Milimeter MPa - Mega Pascal P - Compressive Force . Rock strength is an important property since it requires for

  • Some Drilling Parameters As A Tool To Predict

    Some Drilling Parameters As A Tool To Predict

    Uniaxial Compressive Strength UCS is the simplest factor for specifying the rock. The comparative efficiency of the drilling operation can be expressed by the dimensionless ratio UCSSE 7. Establishing a mean of identifying the actual rock type being drilled is still in its early stages.

  • Prediction Of The Strength And Elasticity Modulus Of

    Prediction Of The Strength And Elasticity Modulus Of

    Dec 14 2015 The uniaxial compressive strength UCS and Youngs modulus E are important parameters in designing solutions to rock engineering problems. However determination of these properties in the laboratory is expensive and time consuming. Therefore many attempts have been made to estimate these properties indirectly by defining various correlations. These correlations often relate UCS

  • Bearing Capacity Of Rocks Iit Kanpur

    Bearing Capacity Of Rocks Iit Kanpur

    In case of rock mass with favorable discontinuities the net allowable bearing pressure may be estimated from q a q c N j Where qWhere q c average uniaxial compressive strength of rock coresaverage uniaxial compressive strength of rock cores N j empirical coefficient depending on the spacing of the discontinuities 3SB 10 1300S thickness of discontinuity thickness of .

  • Correlations Between Index Properties And Unconfined

    Correlations Between Index Properties And Unconfined

    Weathering has a negative effect on both physical and engineering properties of rock specimens and rock masses. When rock masses are weathered it is often difficult to obtain core segments that are the correct size for unconfined compressive strength testing. Thus

  • Chapter Five Classification Of Shear Strength

    Chapter Five Classification Of Shear Strength

    In a rock mass where joint surfaces are characterised by moderate to high joint roughness coefficient values JRC above 6 according to Barton and Choubey 1977 and high joint wall compressive strength values UCS above 100 MPa the shear strength is determined by these characteristics.

  • Is 9143 Method For The Determination Of Unconfined

    Is 9143 Method For The Determination Of Unconfined

    In order to promote public education and public safety equal justice for all a better informed citizenry the rule of law world trade and world peace this legal document is hereby made available on a noncommercial basis as it is the right of all humans to know and speak the laws that govern them.

  • Rock Properties Oocities

    Rock Properties Oocities

    Rock hardness is a term used in geology to denote the cohesiveness of a rock and is usually expressed as its compressive fracture strength. Terms such as hardrock and softrock are used by geologists to distinguishing between igneousmetamorphic and sedimentary rocks respectively.

  • How To Estimate Strength And Modulus Of Rock

    How To Estimate Strength And Modulus Of Rock

    Aug 15 2015 Strength and Modulus of Weathered Rock from SPT Values. In the weathered rock it is difficult to drive the split sampler to the full specified depth as in soil. Hence we may estimate the strength and elastic modulus values of weathered rock by driving the spt apparatus for a fixed number of blows and find the penetration.

  • Estimating Rock Mass Strength Bm 1997 02

    Estimating Rock Mass Strength Bm 1997 02

    The Hoek-Brown strength criterion was applied to estimate the strength of the rock mass at the Aznalcollar open pit. It was shown that by assuming disturbed rock mass a good agreement was found between estimated strength values and back-calculated strengths from observed slope failures in the footwall. These values are probably conservative and

  • 1 Introduction

    1 Introduction

    The UCS values of Luhui granite at room temperature varies because of the difference of sampling locations and weathering conditions of rock specimen for instance the UCS value of Luhui granite that we obtained is 116 MPa which differs from Xi and Zhaos result 23. However the tendency of UCS variation with temperatures is consistent.