(d) Figure 1 shows rock samples being tested for their uniaxial compressive strength (UCS). Some samples display fracture/weakness planes that are at different orientation with respect to the loading axis (as shown by the arrows). The loading configuration of each sample is shown in (i) to (v). Answer the following questions: Between samples (ii) and (iii) which one will display a lower strain at failure? Between sample (ii) and (iv) which one will display a lower Poisson's ratio? Explain briefly why sample (i) and (ii) will exhibit almost similar strengths? Among the 5 samples (i) to (v), which sample will display the lowest compressive strength? State reason for your answer

Structural Analysis
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Chapter2: Loads On Structures
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FIGURES & TABLES
π
π
(i)
(iii)
(iv)
(v)
Figure 1: Compression test on intact and jointed/discontinuous rock samples
WEATHERING DESCRIPTION
RESIDUAL SOIL; ORIGINAL TEXTURE
STRUCTURE AND MINERALOGY
COMPLETELY DESTROYED
COMPLETELY WEATHERED DECOMPOSED
AND FRIABLE, BUT ROCK TEXTURE AND
HIGHLY WEATHERED; WEATHERING
EXTENDS THROUGHOUT ROCKMASS AND
ROCK MATERIAL IS PARTLY FRIABLE
MODERATELY
WEATHERED;
SLIGHTLY WEATHERED; PENETRATIVE
WEATHERING ON OPEN DISCONTINUITY
SURFACES, BUT ONLY SLIGHT
WEATHERING OF ROCK MATERIAL
FRESH, NO VISIBLE SIGN OF WEATHERING
OR FAINTLY WEATHERED WITH
WEATHERING LIMITED TO SURFACE OF
MAJOR DISCONTINUITIES
0.004 0.01
0.04 0.1
0.4 1.0
STRENGTH REDUCTION FACTORI
0.28
1.0
VI
V STRUCTURE PRESERVED
IV
=
|||
=
I
0.001
Transcribed Image Text:FIGURES & TABLES π π (i) (iii) (iv) (v) Figure 1: Compression test on intact and jointed/discontinuous rock samples WEATHERING DESCRIPTION RESIDUAL SOIL; ORIGINAL TEXTURE STRUCTURE AND MINERALOGY COMPLETELY DESTROYED COMPLETELY WEATHERED DECOMPOSED AND FRIABLE, BUT ROCK TEXTURE AND HIGHLY WEATHERED; WEATHERING EXTENDS THROUGHOUT ROCKMASS AND ROCK MATERIAL IS PARTLY FRIABLE MODERATELY WEATHERED; SLIGHTLY WEATHERED; PENETRATIVE WEATHERING ON OPEN DISCONTINUITY SURFACES, BUT ONLY SLIGHT WEATHERING OF ROCK MATERIAL FRESH, NO VISIBLE SIGN OF WEATHERING OR FAINTLY WEATHERED WITH WEATHERING LIMITED TO SURFACE OF MAJOR DISCONTINUITIES 0.004 0.01 0.04 0.1 0.4 1.0 STRENGTH REDUCTION FACTORI 0.28 1.0 VI V STRUCTURE PRESERVED IV = ||| = I 0.001
(d) Figure 1 shows rock samples being tested for their uniaxial compressive
strength (UCS). Some samples display fracture/weakness planes that are at
different orientation with respect to the loading axis (as shown by the arrows).
The loading configuration of each sample is shown in (i) to (v). Answer the
following questions:
Between samples (ii) and (iii) which one will display a lower strain at
failure?
Between sample (ii) and (iv) which one will display a lower Poisson's ratio?
Explain briefly why sample (i) and (ii) will exhibit almost similar strengths?
Among the 5 samples (i) to (v), which sample will display the lowest
compressive strength? State reason for your answer
☐
Transcribed Image Text:(d) Figure 1 shows rock samples being tested for their uniaxial compressive strength (UCS). Some samples display fracture/weakness planes that are at different orientation with respect to the loading axis (as shown by the arrows). The loading configuration of each sample is shown in (i) to (v). Answer the following questions: Between samples (ii) and (iii) which one will display a lower strain at failure? Between sample (ii) and (iv) which one will display a lower Poisson's ratio? Explain briefly why sample (i) and (ii) will exhibit almost similar strengths? Among the 5 samples (i) to (v), which sample will display the lowest compressive strength? State reason for your answer ☐
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