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1.  For the flow net shown in the figure below, if the datum is selected at the downstream water surface, determine: (a) the total head at point b; (b) the pressure head at point b if point b is 11 m below the downstream ground surface (or 13 m below the downstream water surface);

1.  For the flow net shown in the figure below, if the datum is selected at the downstream water surface, determine: (a) the total head at point b; (b) the pressure head at point b if point b is 11 m below the downstream ground surface (or 13 m below the downstream water surface);

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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1.  For the flow net shown in the figure below, if the datum is selected at the downstream water surface, determine:

(a) the total head at point b;

(b) the pressure head at point b if point b is 11 m below the downstream ground surface (or 13 m below the downstream water surface);

The diagram illustrates a cross-sectional view of a geotechnical setup involving layers with different permeability. The key elements in this figure are described below: - **Layers**: - The topmost layer has two tank-like structures with the left tank having a water level 8 meters above the ground and the right side at 2 meters above the datum. - Beneath the surface is a **Permeable Layer**. Its thickness is represented as 12 meters from the ground surface to the top of the next layer. - Below the permeable layer lies an **Impervious Layer**, which prevents water from flowing through it. This layer extends horizontally across the diagram. - **Water Flow and Pressure**: - A central vertical cut or barrier shows a shaded region, indicating a water flow or seepage path from the high water level on the left to the lower level on the right. - Lines of equipotential flow are illustrated as curved dashed lines around the shaded flow path, demonstrating the direction and distribution of water movement through the permeable layer. - **Point b**: - A point labeled "b" is marked within the permeable layer, positioned along one of the equipotential lines. This point could be significant for measuring or studying water pressure, flow rates, or other related variables. - **Additional Details**: - The symbol \( \gamma_{sat} = 17 \, \text{kN/m}^3 \) is provided, representing the saturated unit weight of the soil in the permeable layer. - The diagram includes depth indicators, showing measurements relevant to calculating pressures or evaluating stability. This diagram is useful for understanding groundwater flow, pressure differentials, and the interaction between different soil layers in a geotechnical context.
Transcribed Image Text:The diagram illustrates a cross-sectional view of a geotechnical setup involving layers with different permeability. The key elements in this figure are described below: - **Layers**: - The topmost layer has two tank-like structures with the left tank having a water level 8 meters above the ground and the right side at 2 meters above the datum. - Beneath the surface is a **Permeable Layer**. Its thickness is represented as 12 meters from the ground surface to the top of the next layer. - Below the permeable layer lies an **Impervious Layer**, which prevents water from flowing through it. This layer extends horizontally across the diagram. - **Water Flow and Pressure**: - A central vertical cut or barrier shows a shaded region, indicating a water flow or seepage path from the high water level on the left to the lower level on the right. - Lines of equipotential flow are illustrated as curved dashed lines around the shaded flow path, demonstrating the direction and distribution of water movement through the permeable layer. - **Point b**: - A point labeled "b" is marked within the permeable layer, positioned along one of the equipotential lines. This point could be significant for measuring or studying water pressure, flow rates, or other related variables. - **Additional Details**: - The symbol \( \gamma_{sat} = 17 \, \text{kN/m}^3 \) is provided, representing the saturated unit weight of the soil in the permeable layer. - The diagram includes depth indicators, showing measurements relevant to calculating pressures or evaluating stability. This diagram is useful for understanding groundwater flow, pressure differentials, and the interaction between different soil layers in a geotechnical context.
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