Answered: the unit weight for zones in the cross…

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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$**Exercise Table 7.2** | Depth (m) | Total Pressure σ (kPa) | Neutral Pressure u (kPa) | Effective Pressure σ' (kPa) | |-----------|-----------------------|--------------------------|----------------------------| | 5 | | | | | 10 | | | | | 18 | | | | | 25 | | | | --- **33. Soil Mechanics Exercise** Given the cross-section in Exercise Figure 7.2, calculate values for effective stress. Use both SI and British engineering units. Note: 1 ft = 0.3048 m. In this soil profile, the groundwater table occurs at a depth of 1.2 m (4 ft). Assume that $ G_s = 2.65 $ for all materials. a. Calculate the unit weight for the four different zones in the cross-section. Assume the soil above the water table is completely dry and that below the water table, it is saturated. b. Calculate the total stress, neutral stress, and effective stress for depths of 1.2, 3, 5.5, and 9.1 m (4, 10, 18, and 30 ft). Supply the answers in table form similar to that in Exercise 32. c. Draw a pressure diagram of the soil profile showing total stress, neutral stress, and effective stress. Draw to scale. **Exercise Figure 7.2** - **Soil Layers and Depths:** - **Sand:** GWT (groundwater table) begins at 4 ft with a void ratio $ e = 0.8 $ - **Silty Sand:** Extends till 10 ft with $ e = 0.65 $ - **Clayey Sand:** Ends at 18 ft with $ e = 0.75 $ **34. Standpipe Experiment** Refer to Exercise Figure 7.3 on the next page. A standpipe consists of 20 cm of water and 20 cm of saturated sand below. A column of water held at a constant head is attached to the base of the standpipe as shown. (Note: This text description assumes familiarity with soil mechanics concepts and is meant for students with such background knowledge to perform the calculations and diagrams mentioned.)$

Transcribed Image Text:**Exercise Table 7.2** | Depth (m) | Total Pressure σ (kPa) | Neutral Pressure u (kPa) | Effective Pressure σ' (kPa) | |-----------|-----------------------|--------------------------|----------------------------| | 5 | | | | | 10 | | | | | 18 | | | | | 25 | | | | --- **33. Soil Mechanics Exercise** Given the cross-section in Exercise Figure 7.2, calculate values for effective stress. Use both SI and British engineering units. Note: 1 ft = 0.3048 m. In this soil profile, the groundwater table occurs at a depth of 1.2 m (4 ft). Assume that $ G_s = 2.65 $ for all materials. a. Calculate the unit weight for the four different zones in the cross-section. Assume the soil above the water table is completely dry and that below the water table, it is saturated. b. Calculate the total stress, neutral stress, and effective stress for depths of 1.2, 3, 5.5, and 9.1 m (4, 10, 18, and 30 ft). Supply the answers in table form similar to that in Exercise 32. c. Draw a pressure diagram of the soil profile showing total stress, neutral stress, and effective stress. Draw to scale. **Exercise Figure 7.2** - **Soil Layers and Depths:** - **Sand:** GWT (groundwater table) begins at 4 ft with a void ratio $ e = 0.8 $ - **Silty Sand:** Extends till 10 ft with $ e = 0.65 $ - **Clayey Sand:** Ends at 18 ft with $ e = 0.75 $ **34. Standpipe Experiment** Refer to Exercise Figure 7.3 on the next page. A standpipe consists of 20 cm of water and 20 cm of saturated sand below. A column of water held at a constant head is attached to the base of the standpipe as shown. (Note: This text description assumes familiarity with soil mechanics concepts and is meant for students with such background knowledge to perform the calculations and diagrams mentioned.)

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