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From the following rocks prepare a list in order of their decreasing unconfined compressive strength. For each rock, give the reason for your selection.

From the following rocks prepare a list in order of their decreasing unconfined compressive strength. For each rock, give the reason for your selection.

Principles of Foundation Engineering (MindTap Course List)
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter9: Settlement Of Shallow Foundations
Section: Chapter Questions
Problem 9.6P
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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
Transcribed Image Text: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.
Transcribed Image Text: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.
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