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0.20 Water is pumped from an aquifer, as shown in Figure P9.20, for domestic use. The original groundwater level was at the top of the soft clay and dropped by 10 m. The ground surface subsided. (a) Assuming that the subsidence is due to the settle- ment of the soft clay, estimate the settlement of the ground surface. (b) A decision was made to recharge the aquifer by pumping water from a canal. If the groundwater level were to return to its original level, would the ground surface return to its original elevation? If so, why? If not, why not? Show calculations to support your answer. How much recovery (expan- sion of soil) is possible using the one-dimensional consolidation theory? Original ground surface elevation Lightly cemented (calcium carbonate) sand/gravel : = 17 kN/m3 Clay properties: w = 55% C = 0.4 C, = 0.05 C, = 0.04 m²/yr k̟ = 1 x 106 cm/s k = 5 x 106 cm/s OCR = 1 20 m sat Original groundwater level Soft clay- 5 m :Aquiferºº Sand and gravel. 10% 15 m W = Rock FIGURE P9.20

0.20 Water is pumped from an aquifer, as shown in Figure P9.20, for domestic use. The original groundwater level was at the top of the soft clay and dropped by 10 m. The ground surface subsided. (a) Assuming that the subsidence is due to the settle- ment of the soft clay, estimate the settlement of the ground surface. (b) A decision was made to recharge the aquifer by pumping water from a canal. If the groundwater level were to return to its original level, would the ground surface return to its original elevation? If so, why? If not, why not? Show calculations to support your answer. How much recovery (expan- sion of soil) is possible using the one-dimensional consolidation theory? Original ground surface elevation Lightly cemented (calcium carbonate) sand/gravel : = 17 kN/m3 Clay properties: w = 55% C = 0.4 C, = 0.05 C, = 0.04 m²/yr k̟ = 1 x 106 cm/s k = 5 x 106 cm/s OCR = 1 20 m sat Original groundwater level Soft clay- 5 m :Aquiferºº Sand and gravel. 10% 15 m W = Rock FIGURE P9.20

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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9.20 Water is pumped from an aquifer, as shown in Figure P9.20, for domestic use. The original groundwater level was at the top of the soft clay and dropped by 10 m. The ground surface subsided. (a) Assuming that the subsidence is due to the settle- ment of the soft clay, estimate the settlement of the ground surface. (b) A decision was made to recharge the aquifer by pumping water from a canal. If the groundwater level were to return to its original level, would the ground surface return to its original elevation? If so, why? If not, why not? Show calculations to support your answer. How much recovery (expan- sion of soil) is possible using the one-dimensional consolidation theory? Original ground ace elevation Lightly cemented (calcium carbonate) sand/gravel 17 kN/m3 Original groundwater level Soft clay 20 m Clay properties: w = 55% C_ = 0.4 C, = 0.05 C, = 0.04 m2/yr k = 1 x 10-6 cm/s k = 5 x 10-6 cm/s OCR = 1 sat 5 m %3D Aquifer Sand and gravel w = 10%. 15 m Rock FIGURE P9.20
Transcribed Image Text:9.20 Water is pumped from an aquifer, as shown in Figure P9.20, for domestic use. The original groundwater level was at the top of the soft clay and dropped by 10 m. The ground surface subsided. (a) Assuming that the subsidence is due to the settle- ment of the soft clay, estimate the settlement of the ground surface. (b) A decision was made to recharge the aquifer by pumping water from a canal. If the groundwater level were to return to its original level, would the ground surface return to its original elevation? If so, why? If not, why not? Show calculations to support your answer. How much recovery (expan- sion of soil) is possible using the one-dimensional consolidation theory? Original ground ace elevation Lightly cemented (calcium carbonate) sand/gravel 17 kN/m3 Original groundwater level Soft clay 20 m Clay properties: w = 55% C_ = 0.4 C, = 0.05 C, = 0.04 m2/yr k = 1 x 10-6 cm/s k = 5 x 10-6 cm/s OCR = 1 sat 5 m %3D Aquifer Sand and gravel w = 10%. 15 m Rock FIGURE P9.20
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