Question 12 irec-eav-e anichad aSetyCala. fine-grained limestoneb. fine-grained basaltc. medium-grained diabased. porous tuffe. friable quartz sandstonef. coarse marbleg. medium-grained granite13. When shale is excavated from a deep foundation fora heavy structure (such as a power plant or concretedam), layers of shale may loosen from the bedrockafter a few hours of exposure. To prevent this, accrete slab is placed over the shale soon after excaretion and rock bolts may also be placed through theconcrete into the shale.a. Why does shale have this problem whereas limestone, for example, does not?b. How is this related to the petrography of the rodsposition and origin?18. A certain sandstDeere classificaaccording to Taon Figure 8.10?Barton, N., Lien,sification ofport. Rock MBieniawski, Z. Trock massetute of CiviBieniawski, Z.tions. NewBroch, E., andtest. InteMining SeCargill, J. S.,cal methstrength2716 11. A massive hillside of rhyolite contains joint planesthat dip at an angle of 40° toward a stream valley.A rectangular-shaped rock bounded by other jointplanes rests on the dipping joint plane. The blockmeasures 1.5 m (5 ft) high, 4.5 m (15 ft) wide, and3 m (10 ft) long. The unit weight of the rhyolite is2.76 Mg/m³ (172 lb/ft³). Assume a dry slope.a. What is the weight of the rock block?b. Assuming that only friction holds the block in place(no cohesion along the joint plane), what is theminimum frictional force needed to resist sliding?c. What coefficient of friction is needed to producethis minimum force?d. What would be an actual coefficient of frictionfor this rock block, that is, rhyolite sliding againstrhyolite? A friction angle is commonly used, thecoefficient of friction being equal to the tangent ofthat angle. Determine that angle of friction.12. From the following rocks prepare a list in order oftheir decreasing unconfined compressive strength.For each rock, give the reason for your selection.15.16.17.

Answered: From the following rocks prepare a list…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question 12

irec-
eav-
e a
nich
ad a
S
ety
C
al
a. fine-grained limestone
b. fine-grained basalt
c. medium-grained diabase
d. porous tuff
e. friable quartz sandstone
f. coarse marble
g. medium-grained granite
13. When shale is excavated from a deep foundation for
a heavy structure (such as a power plant or concrete
dam), layers of shale may loosen from the bedrock
after a few hours of exposure. To prevent this, ac
crete slab is placed over the shale soon after excare
tion and rock bolts may also be placed through the
concrete into the shale.
a. Why does shale have this problem whereas lime
stone, for example, does not?
b. How is this related to the petrography of the rods
position and origin?
18. A certain sandst
Deere classifica
according to Ta
on Figure 8.10?
Barton, N., Lien,
sification of
port. Rock M
Bieniawski, Z. T
rock masse
tute of Civi
Bieniawski, Z.
tions. New
Broch, E., and
test. Inte
Mining Se
Cargill, J. S.,
cal meth
strength
2716

11. A massive hillside of rhyolite contains joint planes
that dip at an angle of 40° toward a stream valley.
A rectangular-shaped rock bounded by other joint
planes rests on the dipping joint plane. The block
measures 1.5 m (5 ft) high, 4.5 m (15 ft) wide, and
3 m (10 ft) long. The unit weight of the rhyolite is
2.76 Mg/m³ (172 lb/ft³). Assume a dry slope.
a. What is the weight of the rock block?
b. Assuming that only friction holds the block in place
(no cohesion along the joint plane), what is the
minimum frictional force needed to resist sliding?
c. What coefficient of friction is needed to produce
this minimum force?
d. What would be an actual coefficient of friction
for this rock block, that is, rhyolite sliding against
rhyolite? A friction angle is commonly used, the
coefficient of friction being equal to the tangent of
that angle. Determine that angle of friction.
12. From the following rocks prepare a list in order of
their decreasing unconfined compressive strength.
For each rock, give the reason for your selection.
15.
16.
17.

Expert Solution

Step 1 Introduction

The utmost compressive stress that a plastic specimen can sustain before rupturing or deforming by a specific percentage is known as compressive strength. The load is gradually added to the rock core sample until it fails during the UCT test. The rock sample's stress-strain curve and characteristics like unconfined compressive strength, Young's modulus, and poison's ratio may be established from the curves using the load-displacement data.

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