Determination of drillability of some natural stones and ...

correct drilling machine, the petrographic structure of the rock, its hardness, abrasion, physical characteristics and mechanical properties are to be determined firstly by in-situ and laboratory studies. Penetration rate is the progression of the drilling bit into the rock in a certain period of time, which is generally expressed as "m/min".

Predicting Unconfined Compressive Strength of Intact …

2021-8-21 · Bedrock unconfined compressive strength (UCS) is a key parameter in designing the ... mining engineers than the other rock properties. Therefore, it can be concluded that UCS is the most ... UCS BPI PLS Granite, schist, and sandstone [30] UCS 12 .5 PLS Pyroclastic rocks [31] UCS 24.301 4.874 TS Basalt and limestone [32] 18 .251 0.0162 43 .214

Some Useful Numbers

2014-12-28 · Granite 24 GPa Shale 1.6 GPa Limestone 24 GPa Chalk 3.2 GPa Sandstone 0.4 GPa Steel 80 GPa Wood 4 GPa Glass 19 GPa Lithostatic pressure gradient 26.46 MPa/km (for = 2.70) Hydrostatic pressure gradient 9.8 MPa/km Unconfined compressive strength Granite 100-250 MPa Basalt 100-300 MPa Quartzite 150-300 MPa Sandstone 20-170 MPa

Lecture 9 – Introduction to Rock Strength David Hart ...

2009-1-8 · 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 ...

Correlation between Uniaxial Compressive Strength and ...

2008-6-6 · Rock engineers widely use the uniaxial 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 and American Society for Testing and Materials. The method is time consuming and expensive. Indirect tests such as Point Load Index (Is(50)) are used to predict the UCS. …

Determination and Estimation of Uniaxial Compressive ...

2015-5-10 · Ng, I. T., and C. H. Lau. "Determination and Estimation of Uniaxial Compressive Strength for Macau Granite." Paper presented at the 13th ISRM International Congress of Rock Mechanics, Montreal, Canada, May 2015.

THE UNIAXIAL COMPRESSIVE STRENGTH OF SOFT ROCK

Keywords: soft rock, uniaxial compressive strength, physical characte ristic, point load strength index, and conversion factor. INTRODUCTION strength due to changes in moisture content seems The term soft rock is often referred to rock materials with a uniaxial compressive strength (UCS) lower than that of hard rocks and higher than that of soils.

8. STRENGTH OF SOILS AND ROCKS

2009-2-23 · strength is the most commonly measured strength parameter and this is also true of rock specimens. For the uniaxial or unconfined compressive strength test a right circular cylinder of the material is compressed between the platens of a testing machine as illustrated in Fig. 8.1. The

Estimation of Uniaxial Compressive Strength of Coal ...

2020-10-13 · The uniaxial unconfined compressive strength (UCS) is an important mechanical property of the rock mass having several implications in planning and de signing both underground and opencast coal mines. UCS is usually determined on core samples obtained fr om exploratory boreholes and tested either in the field or preferably in the laboratory.

Unconfined Compression Test | Geoengineer

The Unconfined Compression Test is a laboratory test used to derive the Unconfirmed Compressive Strength (UCS) of a rock specimen. Unconfirmed Compressive Strength (UCS) stands for the maximum axial compressive stress that a specimen can bear under zero confining stress.

SOME DRILLING PARAMETERS AS A TOOL TO PREDICT …

2014-7-5 · 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.

Shear strength between cemented paste backfill and …

amount of water. After hardening, the natural rock mortar replicas are removed from the moulds, and will then be used as rock sidewall (Figures 2(d) and (e)). After 28 days of curing, the average unconfined compressive strength (UCS) was around 56 MPa. A total of four granite surfaces (G1 to …

The Relation Between Uniaxial Compressive and Brazilian ...

2016-8-29 · CSM data set consists of the UCS and BTS values of 182 different rock types, mainly welded tuff, granite, sandstone, limestone, and argillite. The data have very wide strength range. The UCS values ranges from 1.3 to 468.5 MPa. But, the strength of most samples is less than 150 MPa.

Uniaxial Compressive Strength Determination of Rocks Using ...

2021-5-31 · The uniaxial compressive strength (UCS) is an important parameter for rock mass classification and rock engineering designs. This study proposes a novel method for predicting the UCS of rocks using X-ray computed tomography and convolutional neural networks. First, X-ray CT scanning was conducted on five mudstone specimens. The volume data characteristics of the different density …

Predicting the unconfined compressive strength of the ...

2008-11-3 · 320.] reported that mining engineers request the uniaxial compressive strength (UCS) more often than any other rock property. However, standards set for specimen preparation are very demanding. Therefore it is quite di†cult and sometimes impossible to

TBM borability as a function of rock mineralogy and ...

2020-11-29 · excavability are rock mass characteristics, strength of the rock in addition to machine parameters like design of cutter head. In this paper, a simple method of determining the Cutter life of TBM from petrographic test and geotechnical data which was carried out for Tunnel-1 is discussed.

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.

Estimating rock strength parameters using drilling data ...

Estimating rock strength parameters using operational drilling data can be a fast and reliable method. In this case, several researchers have proposed different analytical models based on force or energy equilibrium methods.Most of them propose methods to estimate uniaxial compressive strength through the investigation of interaction between the bit and rock in drilling process.

GeoConsult

With the new CONTROL 2000kN, model 50-C4622 we can now offer industry standard uniaxial compressive strength (UCS) testing. UCS is the capacity of a material to withstand axially directed crushing forces. When the limit of comprehensive strength is reached, specimens fail, and are crushed.

Uniaxial Compressive Strength

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.

Pillar Strength in Underground Stone Mines in the United ...

2012-8-30 · strength equation can be used to design stable stone mine pillars provided the rock conditions are similar to those included in the study. 1. Introduction. There are more than 120 operating underground stone mines in the United States that use the room-and-pillar method of mining. Mining is typically conducted in flat laying or gently

Effects of Grain Scale Heterogeneity on Rock Strength and ...

A mineral-specific constitutive model was created and calibrated using published values and real laboratory strength values. Brazilian tensile strength and unconfined compressive strength (UCS) model tests were developed using the finite-difference modeling software FLAC to perform parametric analysis of a series of geological characteristics ...

A new empirical formula for evaluating uniaxial ...

2019-11-1 · 1. Introduction. Uniaxial compressive strength (UCS) is an important mechanical parameter for rock classification, rock mass engineering design and rock mass stability analysis, and it can also be used to assess rock material strength in Rock Mass Rating (RMR). 1 Conventionally, the UCS of rocks can be determined by the uniaxial compressive tests, as suggested by the International Society for ...

Unconfined Compressive Strength Test of Rock

2016-9-15 · This test method specifies the apparatus, instrumentation, and procedures for determining unconfined compressive strength of intact rock core specimens. This procedure is identical to ASTM D 2938 except that the cores are tested after cutting without grinding, and neoprene caps are used on the specimen ends. Unconfined Compressive Strength …

UNIAXIAL COMPRESSIVE STRENGTH OF MALAYSIAN …

2017-7-27 · cyclic loading on the uniaxial compressive strength of weathered granite. Behavior of rock specimens under cyclic loading will be assessed and the possible effects on the uniaxial compressive strength will be analyzed. METHODOLOGY This study is primarily a laboratory experimental works on tropically weathered granite rocks. More than 30

(PDF) Determination of Drilling Rate Index Based on Rock ...

Seven parameters of the rock or rock mass, including uniaxial compressive strength (UCS) of the rock, Schmidt hammer hardness value, quartz content, fragment size (d80), alteration, and joint dip ...

Practical estimates of rock mass strength

2012-2-15 · tests tend to overestimate the in-situ rock mass strength. Extensive laboratory tests and field studies on excellent quality Lac du Bonnet granite, reported by Martin and Chandler [7], suggest that the in-situ strength of this rock is only about 70% of that measured in the …

Correlation of Mechanical Properties of Some Rocks in ...

2021-6-4 · Pomeroy (1966) was used in the impact strength index test. A 100g sample of rock in the size range 3,175 - 9.525 mm is placed dropped 20 times from a height 30.48cm on to the rock sample. The impact Strength index was then measured (i.e. the amount of rock remaining in the initial size range after the test, table 4).

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Correlation between uniaxial compressive strength (UCS) and blasting geometry on rock excavation at PT Agincourt Resources . D R Nainggolan. 1*, R Sitorus. 2, O N Eveny. 1. and F Sariandi. 1. 1. Mining Engineering Department, Faculty of Mineral Technology University of Pembangunan Nasional Veteran Yogyakarta located on Jl. SWK 104

USING THE POINT LOAD TEST TO DETERMINE THE …

2012-8-29 · This index can be used to estimate other rock strength parameters. The focus of this paper is to present the data analysis used to correlate the point load test index (Is50) with the uniaxial compressive strength (UCS), and to propose appropriate Is50 to UCS conversion factors for different coal measure rocks. The rock strength determined by ...

(PDF) Correlation between uniaxial strength and point load ...

Determination of rock engineering properties is important in civil, mining and geotechnical engineering. Uniaxial Compressive Strength (UCS) is one of the most important properties of rocks.

Predicting the compressive and tensile strength of rocks ...

2012-5-24 · Rock engineers have commonly used the uniaxial compressive strength (UCS) and Brazilian tensile strength (BTS) of rock for designing surface and underground structures. Determining these rock strengths is time- consuming and expensive, particularly for the preliminary studies of projects.

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