4.19 A trapezoidal excavation is required to construct a foundation, 3 m x 3m, for an electric trans-former station as shown in Figure P4.19. (a) Calculate the minimum flow rate of a pump toprevent a buildup of water in the excavation, (b) If the faces of the excavation are lined withan impermeable material, wlhat must be the minimum weight of the transformer and its base toprevent uplift?TranstormerExcavation taceFine sand (SP)1.5 mk, = 2 x10 cm'sLow plasticity silt iML)k, 4 x10 cm/sHigh plasticity, fat clay with sand and silt (CH)k, = 2 x10 cm/s0.9 m0.6 m3 m3 mHomogeneous, impervious clayFigure P4.19

Given, Kfine sand=2×10-4 cm/s=K1KLow plasticity silt=4×10-5 cm/s=K2Khigh plasticity clay=2×10-8…

4.19 A trapezoidal excavation is required to construct a foundation, 3 m x 3m, for an electric trans- former station as shown in Figure P4.19. (a) Calculate the minimum flow rate of a pump to prevent a buildup of water in the excavation. (b) If the faces of the excavation are lined with an impermealble material, what must be the minimum weight of the transformer and its base to prevent uplift? Transtormer Eacavation tace Fine sand (SP) 1.5 m k, = 2 110* cm's Low plasticity silt iVL k, = 4 10 cm/s High plasticity., fat clay with sand and silt (CH) k, = 2 x10 cm/s 0.9 m 0.6 m 3 m 3 m Homogeneous, impervious clay Figure P4.19

4.19 A trapezoidal excavation is required to construct a foundation, 3 m x 3m, for an electric trans- former station as shown in Figure P4.19. (a) Calculate the minimum flow rate of a pump to prevent a buildup of water in the excavation. (b) If the faces of the excavation are lined with an impermealble material, what must be the minimum weight of the transformer and its base to prevent uplift? Transtormer Eacavation tace Fine sand (SP) 1.5 m k, = 2 110* cm's Low plasticity silt iVL k, = 4 10 cm/s High plasticity., fat clay with sand and silt (CH) k, = 2 x10 cm/s 0.9 m 0.6 m 3 m 3 m Homogeneous, impervious clay Figure P4.19

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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