uni axial compressive strength of granite

CORRELATION BETWEEN UNIAXIAL COMPRESSIVE …

2.1 Classification of rocks on the basis of uniaxial compressive strength 15 2.2 Correlation between UCS and Is 17 3.1 Coring Machine 22 3.2 Rock disc cutter 23 3.3 Lapping machine 24 3.4 Samples of limestone and granite prior to testing of uniaxial compressive strength 24 3.5 Tinius Olsen Super "L" Hydraulic Universal Testing Machine 26

Ucs Rock Strength Granite

Ucs Rock Strength Granite. The compressive strength of granite (depth = 13772002 m) taken from gpk-1 (see fig.1 for location) was found to range between 120 and 485 mpa at a confining pressure of 40 mpa (rummel 1992), and uniaxial compressive strength (ucs) values between 100 and 130 mpa are reported for unaltered granite from soultz-sous-forts in an unpublished.

compressive strength of china granite rock

Compressive strength of rocks PetroWiki. Jun 04, 2015· 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.

Uniaxial Compressive Strength - an overview ...

The uniaxial compressive strength of a rock under static loading often decreases with an increasing temperature at which the rock has been heat-treated before strength testing. This conclusion is drawn from a great number of experiments [1,2,4,8,9,11,17–19].The higher the temperature is, the lower the strength. Some results for uniaxial compressive strength σ c and tensile strength σ t ...

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1 ...

STRENGTH PROPERTIES OF ROCKS AND ROCK MASSES 1. INTRODUCTION 2. TESTING OF INTACT ROCK FOR STRENGTH 2.1 Uniaxial Compression 2.2 Point Load Testing 2.3 Uniaxial Tension 2.4 Indirect Tension Tests 2.5 Shear Tests 2.6 Confined Compression Tests (Triaxial Tests) 2.7 Biaxial and Multiaxial Tests 2.8 Other Tests 3. PARAMETERS AFFECTING ROCK STRENGTH 4.

Uniaxial compressive strength ( c) and deformation modulus ...

Uniaxial compressive strength ( ... Granite 154 48 313 71 169 42 250 20 Granodiorite 160 51 319 2 171 20 118 2 Gabbro 228 106 466 5 248 76 306 1 Norite 229 82 356 8 - - - - Olivinestone - - - - 87 113 1307 5 Peridotite 197 55 280 1 109 164 1502 1 Monzonite 110 28 256 8 106 61 580 4 ...

Deformation and failure characteristics of weathered ...

In this paper, we have examined the crack formation of weathered granite by monitoring acoustic emissions (AE) under uniaxial compression. Except for the uniaxial compressive strength (UCS), the thresholds have been determined for crack closure, crack initiation and crack damage, respectively. Moreover, the relationship has been preliminarily established between the AE energy and the rock ...

Mechanical Responses of a Deeply Buried Granite Exposed to ...

Eight granite samples (#1–#8) are used for uniaxial testing. #1–#3 are monotonically loaded with a rate of 2 mm/min. The axial stress rate approximately ranges between 0.15 and 0.25 MPa/s. Monotonic quasistatic uniaxial tests are performed to determine the uniaxial compressive strength (UCS) of the granite samples.

Figure 4 | Mechanical Responses of a Deeply Buried Granite ...

(a) Compressive strength for all 16 tested granite samples. (b) Average compressive strength obtained from uniaxial and triaxial tests; uniaxial testing data from published literature. (c) Uniaxial compressive strength under monotonic and cyclic loading.

Granite Compressive Strength

Posted: (6 days ago) Jun 21, 2018 · The compressive strength of granite (depth = 1377–2002 m) taken from GPK-1 (see Fig. 1 for location) was found to range between 120 and 485 MPa at a confining pressure of 40 MPa (Rummel 1992), and uniaxial compressive strength (UCS) values between 100 and 130 MPa are reported for unaltered granite from ...

PETROLOGICAL AND STRENGTH PROPERTIES OF GRANITE …

2.11 Point load strength versus uniaxial compressive strength 26 2.12 Linear zero-intercept functions between uniaxial compressive Strength and point load index 27 2.13 The correlation between UCS and I S(50) on different rock types 28 2.14 Correlations of I S(50) with UCS presented individually for

Experimental study on granite acoustic emission and micro ...

The inclined uniaxial compression strength (IUCS) and peak shear strength ((tau_{peak})) of each specimen stress–strain curves are calculated based on Eqs. ( 13 ) …

(PDF) Mechanical Responses of a Deeply Buried Granite ...

Figure 4: (a) Compressive strength for all 16 tested granite samples. (b) Average compressive strength obtained from uniaxial and triaxial (b) Average compressive strength obtained from uniaxial ...

8. STRENGTH OF SOILS AND ROCKS

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 compressive strength is then defined as the maximum load applied to crush the specimen divided by …

Experimental Investigation on Uniaxial Compression ...

Failure behavior of pillars in deep mines is affected by various cyclic loads that cause initial pre-damage. Pillars will be further damaged and developed in the long-term compressive stress until they are destroyed. To reveal the strength characteristics and crack damage fracture laws after rock pre-damage, uniaxial compression tests were carried out on granite specimens damaged by cyclic ...

11 Rock mass properties

Table 11.2: 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 100 - 250

DETERMINATION OF UNIAXIAL COMPRESSIVE STRENGTH …

Uniaxial Compressive Strength (UCS) defines mechanical strength of the intact rock material and it is one of the most used parameters in rock engineering. In the laboratory, it is determined by uniaxial compression on circular cylinder specimens according to standardized test procedures [1, 2].

Use of Ultrasonic Velocity Travel Time to Estimate ...

A total of 70 and 24 ultrasonic and uniaxial compressive strength tests have been conducted on the granite and schist respectively. Figures 4 and 5 show the laboratory results of granite and schist plotted against the established empirical relationships between uniaxial compressive strength (UCS) and ultrasonic velocity travel time (t p)

Experimental Study on Uniaxial Mechanical Properties of ...

In order to study the uniaxial mechanical properties and failure modes of granite under the condition of thermo-liquid coupling, the granite was subjected to thermo-liquid coupling cyclic treatment at different temperatures, and then its mechanical properties were analyzed by uniaxial compression test. The results reflect the following trends: (1) the stress–strain curve generally …

Estimating in situ rock mass strength and elastic modulus ...

The compressive strength of granite (depth = 1377–2002 m) taken from GPK-1 (see Fig. 1 for location) was found to range between 120 and 485 MPa at a confining pressure of 40 MPa (Rummel 1992), and uniaxial compressive strength (UCS) values between 100 and 130 MPa are reported for unaltered granite from Soultz-sous-Forêts in an unpublished ...

Neural tree for estimating the uniaxial compressive ...

Abstract: Uniaxial Compressive Strength (UCS) is the most important parameter that quantifies the rock strength. However, determination of the UCS in the laboratory is very expensive and time-consuming. Therefore, common index tests like point load (Is -50), ultrasonic velocity test (V P), block punch index (BPI)

Unconfined Compression Test | Geoengineer.org

In particular, the Uniaxial Compressive Strength is re-calculated as: σ c = σ UCS / (0.88 + 0.222*(D/L) ) Where σ c is the corrected uniaxial compressive strength. Rock characterization and typical range of UCS based on rock types . Based on their Uniaxial Compressive Strength, rocks can be characterized from very weak to very strong as ...

Prediction of uniaxial compressive strength of granitic ...

Most of these studies considered the uniaxial compressive strength of the granitic rocks as an indicator for the suitability of the granitic rocks in industrial use for determination of the degree of weathering. For this reason, the practical determination of the UCS of granitic rocks is highly important for rock engineering work.

DEFORMATION AND FAILURE CHARACTERISTICS OF GRANITE …

In this paper,the TAW-2000 servo triaxial testing machine and acoustic emission testing equipment are used to analyze the characteristics of granite under uniaxial compression at 25~650℃ after high temperature. The variation rules of longitudinal wave velocity,maximum strength and AE counts with time are analyzed respectively. The results show that the P-wave velocity and the maximum ...

Thermal effects on failure characteristics of granite with ...

Fissures have a great influence on the strength of granite in a uniaxial compression test. It is obvious that the compressive stress exhibits an approximately linear upward relation with increasing α in the range from 30 to 60° (as shown in Figure 3 ).

compressive strength and the factor m in Hoek-Brown ...

Normal variation of compressive strength and the factor m in Hoek-Brown failure criterion for some rocks (data from Hanssen, 1988; Hoek and Brown, 1980 and Hoek et al., 1992). Rock name Uniaxial compressive strength c Rating of the factor Rock name Uniaxial compressive strength c factor Rating of the low average high m i

Depth Variability of Compressive Strength Test Results of ...

This study shows that the uniaxial compressive strength of Toki granite varies significantly along the investigated boreholes. Attention was therefore focused on these variations and potential explanations. One of the factors playing a role in the variation of the intact rock strength seems to be the vicinity to the surface of the granite basement.

Study of dynamic uniaxial compressive strength of rock ...

The study of dynamic uniaxial compressive strength of granite at strain rate from 10-4 to 10 0 s-1 is conducted using sliding crack model. It is shown that the theoretical strengths increase with increasing strain rate and agree well with the experimental results.