ucs rock strength granite

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Rock mass properties

Rock mass properties 6 Table 2: Field estimates of uniaxial compressive strength Grade* Term Uniaxial Comp Strength (MPa) Point Load Index (MPa) Field estimate of strength Examples R6 Extremely Strong >250 >10 Specimen can only be chipped with a geological hammer Fresh basalt, chert, diabase, gneiss, granite, quartzite R5 Very strong...

Mining Rock Mass Rating

of Strength Examples* R5 Extremely Strong >250 >10 50 - 60 Rock material only chipped under repeated hammer blows fresh basalt, chert, diabase, gneiss, granite, quatzite R4 Very Strong 100 - 250 4 - 10 40 - 50...

Mining Rock Mass Rating

of Strength Examples* R5 Extremely Strong >250 >10 50 - 60 Rock material only chipped under repeated hammer blows fresh basalt, chert, diabase, gneiss, granite, quatzite R4 Very Strong 100 - ,...

compressive strength and the factor m in Hoek

i is the parameter for intact rock in the Hoek -Brown failure criterion for rock masses by Hoek et a l (1998) Values in parenthesis have been estimated by Hoek et al (1992); values with question mark have been assumed 2) For clays the values of the uniaxial compressive strength ,...

Estimating Hoek

Hoek-Brown rock mass strength parameters m, s, and O'c are suggested To incorporate the results of practical applications of the failure criterion under real engineering conditions, Hoek and Brown proposed equations to estimate rock mass strength ,...

granite ucs conversion factor

The strength conversion factor (k) is the ratio between the uniaxial compressive strength (UCS) and the point load index (PLI)It has been used to estimate the UCS from the PLI since the 1960s Many researchers have investigated the relationship between UCS and PLI for various rock ,...

Bearing Capacity of Rocks

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 3+S/B 10 []1+300(δ/S) δ= thickness of discontinuity= thickness of ....

Compressive strength of basalt rock

Granite - Wikipedia, the free encyclopedia Granite /ˈɡrænɨt/ is a common type of felsic intrusive igneous rock which is , of granite is between 265 and 275 g/cm3, its compressive strength usually lies ....

Bearing Capacity of Rocks

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 3+S/B 10 []1+300(δ/S) δ= thickness of ,...

Bearing Capacity of Rocks

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 ,...

Strength criterion for rocks under compressive

B Haimson, C ChangA new true triaxial cell for testing mechanical properties of rock, and its use to determine rock strength and deformability of westerly granite International Journal of Rock Mechanics and Mining Sciences, 37 (3) (2000), pp 285-296...

Rock properties

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 ,...

Estimating Rock Mass Strength

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...

Some Useful Numbers

Some Useful Numbers on the Engineering Properties of Materials (Geologic and Otherwise) GEOL 615 Coefficient of sliding friction ( ) For most rocks, varies between 08 and 05 A value of 060 would be a good number for general use Glass on glass 04 Rubber on concrete 075 Steel on steel 055 Angle of internal friction ( Rock 30...

Compressive strength of basalt rock

Granite - Wikipedia, the free encyclopedia Granite /ˈɡrænɨt/ is a common type of felsic intrusive igneous rock which is , of granite is between 265 and 275 g/cm3, its compressive strength ,...

Compressive strength of rocks

Estimating compressive strength General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C 0)Lithology is commonly derived during log analysis, so m may be estimated (Table 1)What is needed still is an initial measure of rock strength provided by C 0 C 0 can be estimated from porosity or sonic ,...

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