### relationship between texture and uniaxial compressive ...

strength of rocks akbar esmailzadeh a*, shekar behnam a, reza mikaeil a, masoud zare naghadehi b, salar saei a a ... rock sample ucs (mpa) rock sample ucs (mpa) granite maraghe 87.5 joshan-rood 95 limestone 17 40 monzonite 57 limestone 75 51 cheshme-haji 63.23 west sample 84.6 red travertine 53 east sample 98.9 khalkhal travertine 50.5 sanje mine 67 ordud 4 87 west ordud 82.5 …

Get Price### estimating rock mass strength - bm 1997 02

estimating rock mass strength using the hoek-brown failure criterion and rock mass classification —a review and application to the aznalcollar open pit by jonny sjöberg division of rock mechanics luleå university of technology se-971 87 luleå sweden. i preface this report constitutes part of a joint research project between boliden mineral …

Get Price### bayesian learning–based data analysis of uniaxial ...

estimation on the uniaxial compressive strength (ucs) of rock is an important issue in geotechnical engineering. empirical relation establishment for ucs estimation is particularly favorable since core sample measurement is expensive, time consuming, and even infeasible. in this paper, two-stage bayesian learning–based data analysis of ucs of rock is proposed. in the first stage, the sparse ...

Get Price### correlation between uniaxial compressive strength and ...

compressive strength (ucs) of rocks in designing surface and underground structures. the procedure for measuring this rock strength has been standardized by both the international society for rock mechanics [1] and american society for testing and materials [2]. the method is time consuming and expensive. indirect tests such as point load index (is(50)) are used to predict the ucs. these tests ...

Get Price### uniaxial compressive strength - an overview ...

uniaxial compressive strength (ucs) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. tests are typically performed on intact lengths of nq, hq, or pq diamond drill core and record the maximum axial load sustained at the point of failure. the international society for rock mechanics (isrm) standard terminology for ucs is very low (<

Get Price### correlation between uniaxial compressive strength …

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 is - point-load index strength is 50 - corrected point-load index strength f - size correction factor d - depth w - width mm2 - milimeter per squared m2 - meter per squared a o - initial cross ...

Get Price### uniaxial compressive strength of granite

uniaxial compressive strength (ucs) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. tests are typically performed on intact lengths of nq, hq, or pq diamond drill core and record the maximum axial load sustained at the point of failure.

Get Price### assessing the uniaxial compressive strength and …

measuring the uniaxial compressive strength (ucs) and the tangent young's modulus (et) in the laboratory requires premium quality specimens with special core dimensions. this research focuses on correlations both ucs and et with leeb rebound hardness test (lrh). in the laboratory, ucs, et, and lrh were performed on 90 core samples extracted from 30 different rock boulders collected from the ...

Get Price### lecture 9 – introduction to rock strength david hart ...

that rock strength is affected by the size of the specimen tested. this can be explained simply as being the result of the many flaws found in rock in the form of fissures, pores, cleavage, bedding planes, foliation, etc. the larger the size of the specimen tested the higher the probability that a weak flaw will be available, capable of initiating failure. 15 20 25 30 35 40 45 uniaxial ...

Get Price### a hybrid modelling approach for prediction of ucs of rock ...

the granite is an igneous crystalline rock, and it is virtually isotropic in nature. the sandstone is a sedimentary rock, and it is porous in nature. the schist is a metamorphic rock, and it is anisotropic in nature. four main factors including bpi, is(50), srh and usv were considered as input variables, while the ucs of rocks was the output ...

Get Price### lecture 9 – introduction to rock strength david hart ...

that rock strength is affected by the size of the specimen tested. this can be explained simply as being the result of the many flaws found in rock in the form of fissures, pores, cleavage, bedding planes, foliation, etc. the larger the size of the specimen tested the higher the probability that a weak flaw will be available, capable of initiating failure. 15 20 25 30 35 40 45 uniaxial ...

Get Price### compressive strength of granite rock - casawyb.de

ucs rock strength granite. the strength standard of rock under compression and tension, where s is the principal stress, the rock compressive strength 3 is the secondary principal stress, c is the uniaxial compressive strength ucs, m is the material related parameters, but the test results of cylindrical rock samples compressed under cp = 23 show that there are many forces.

Get Price### some drilling parameters as a tool to predict the ...

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 (ucs/se) [7]. establishing a mean of identifying the actual rock type being drilled is still in its early stages. however, research at nottingham university has produced some very encouraging results.several samples ...

Get Price### quantification of microcrack characteristics and ...

01.12.2017· we then performed uniaxial deformation experiments to study the influence of thermal microcracking on rock stiffness and uniaxial compressive strength (ucs). we compare our experimental ucs measurements on the thermally microcracked granite samples with the upscaled predictions from ashby and sammis' micromechanical sliding wing crack model 20 (using data from our quantitative …

Get Price### estimating rock mass strength - bm 1997 02

estimating rock mass strength using the hoek-brown failure criterion and rock mass classification —a review and application to the aznalcollar open pit by jonny sjöberg division of rock mechanics luleå university of technology se-971 87 luleå sweden. i preface this report constitutes part of a joint research project between boliden mineral …

Get Price### compressive strength and the factor m in hoek-brown ...

rock name uniaxial compressive strength c ... claystone 70 conglomerate augen gneiss cha lk dolomite garnet mica schist granite gneiss greywacke 80 limestone 65 mudstone gneiss shale 19 sandstone siltstone 3' tuff 60' igneous rocks 75' andesite anorthosite mica gneiss basalt diabase (dolerite) mica schist diorite 65 gabbro 95 granite phyllite (30) granodiorite monzonite 125 …

Get Price### relationship between texture and uniaxial compressive ...

strength of rocks akbar esmailzadeh a*, shekar behnam a, reza mikaeil a, masoud zare naghadehi b, salar saei a a ... rock sample ucs (mpa) rock sample ucs (mpa) granite maraghe 87.5 joshan-rood 95 limestone 17 40 monzonite 57 limestone 75 51 cheshme-haji 63.23 west sample 84.6 red travertine 53 east sample 98.9 khalkhal travertine 50.5 sanje mine 67 ordud 4 87 west ordud 82.5 …

Get Price### some useful numbers - jackson school of geosciences

cohesive strength ( 0) rock 10,000 kpa silt 75 kpa clay 10-20 kpa very soft clay 0- 48 kpa soft clay 48-96 kpa medium clay 96-192 kpa stiff clay 192-384 kpa very stiff clay 384-766 kpa hard clay >766 kpa density ( sandy soil 1800 kg/m3 gravel soil 2000 kg/m3 silty soil 2100 kg/m3 clay soil 1900 kg/m3 mafic igneous rocks 3000 kg/m3 felsic igneous rocks 2700 kg/m3 metamorphic rocks 2700 kg/m3 ...

Get Price### assessing the uniaxial compressive strength and …

measuring the uniaxial compressive strength (ucs) and the tangent young's modulus (et) in the laboratory requires premium quality specimens with special core dimensions. this research focuses on correlations both ucs and et with leeb rebound hardness test (lrh). in the laboratory, ucs, et, and lrh were performed on 90 core samples extracted from 30 different rock boulders collected from the ...

Get Price### correlations between index properties and unconfined ...

point load strengths have better correlations with unit weight than indirect tensile strengths. unconfined compressive strength was correlated to index strength and weathering using three different approaches. for all approaches, indirect tensile strength has a better correlation with unconfined compressive strength than point load strength ...

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