The image depicts a cross-sectional diagram of a drilled shaft embedded in different soil layers, designed for educational purposes. ### Description:1. **Drilled Shaft**: A vertical structure is shown penetrating through two distinct soil layers.2. **Soil Layers**: - **Medium Clay Layer**: - Thickness: 4.0 meters. - Skin friction, $ f_s $: 30 kPa. - **Stiff Clay Layer**: - Thickness: 15.0 meters. - Skin friction, $ f_s $: 60 kPa. - Tip resistance, $ q_t' $: 2000 kPa.3. **Groundwater Table**: Indicated within the stiff clay layer, showing the level at which groundwater is present.### Key Components:- **Arrows** indicate the depth measurements of each layer and the total penetration of the shaft.- **Soil Properties**: Each clay type is characterized by its respective skin friction and, for stiff clay, also by tip resistance, crucial for engineering evaluations.- **Dotted Region**: Represents the stiff clay layer, highlighting a typical representation style in geotechnical diagrams.This diagram serves as an educational tool for understanding drilled shaft design and soil interaction in geotechnical engineering. **Question 2.**A 500-mm diameter, 15-m deep drilled shaft foundation is to be constructed in the soil profile shown below. The design axial load is 700 kN. The factor of safety for downward loading is 3.0, and the factor of safety for upward loading is 6.0. Compute the allowable downward and upward loads capacity and determine if the design is acceptable.**Diagram Explanation:**- **Drilled Shaft:** A cylindrical structure extending into the soil, 15 m deep.- **Soil Layers:** - **Medium Clay:** - Depth: 4.0 m - Shear strength $ f_s = 30 \, \text{kPa} $ - **Stiff Clay:** - Extends from 4.0 m to 15.0 m (11 m thick layer) - Shear strength $ f_s = 60 \, \text{kPa} $ - End bearing capacity $ q' = 2000 \, \text{kPa} $- **Groundwater Table:** Located 6.5 m below the surface.Determine the downward and upward load capacities based on the factors of safety and soil properties provided.

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Answered: Question 2. A 500-mm diameter, 15-m…

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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The image depicts a cross-sectional diagram of a drilled shaft embedded in different soil layers, designed for educational purposes.

### Description:

1. **Drilled Shaft**: A vertical structure is shown penetrating through two distinct soil layers.

2. **Soil Layers**:
- **Medium Clay Layer**:
- Thickness: 4.0 meters.
- Skin friction, $ f_s $: 30 kPa.
- **Stiff Clay Layer**:
- Thickness: 15.0 meters.
- Skin friction, $ f_s $: 60 kPa.
- Tip resistance, $ q_t' $: 2000 kPa.

3. **Groundwater Table**: Indicated within the stiff clay layer, showing the level at which groundwater is present.

### Key Components:

- **Arrows** indicate the depth measurements of each layer and the total penetration of the shaft.
- **Soil Properties**: Each clay type is characterized by its respective skin friction and, for stiff clay, also by tip resistance, crucial for engineering evaluations.
- **Dotted Region**: Represents the stiff clay layer, highlighting a typical representation style in geotechnical diagrams.

This diagram serves as an educational tool for understanding drilled shaft design and soil interaction in geotechnical engineering.

$**Question 2.** A 500-mm diameter, 15-m deep drilled shaft foundation is to be constructed in the soil profile shown below. The design axial load is 700 kN. The factor of safety for downward loading is 3.0, and the factor of safety for upward loading is 6.0. Compute the allowable downward and upward loads capacity and determine if the design is acceptable. **Diagram Explanation:** - **Drilled Shaft:** A cylindrical structure extending into the soil, 15 m deep. - **Soil Layers:** - **Medium Clay:** - Depth: 4.0 m - Shear strength $ f_s = 30 \, \text{kPa} $ - **Stiff Clay:** - Extends from 4.0 m to 15.0 m (11 m thick layer) - Shear strength $ f_s = 60 \, \text{kPa} $ - End bearing capacity $ q' = 2000 \, \text{kPa} $ - **Groundwater Table:** Located 6.5 m below the surface. Determine the downward and upward load capacities based on the factors of safety and soil properties provided.$

Transcribed Image Text:**Question 2.** A 500-mm diameter, 15-m deep drilled shaft foundation is to be constructed in the soil profile shown below. The design axial load is 700 kN. The factor of safety for downward loading is 3.0, and the factor of safety for upward loading is 6.0. Compute the allowable downward and upward loads capacity and determine if the design is acceptable. **Diagram Explanation:** - **Drilled Shaft:** A cylindrical structure extending into the soil, 15 m deep. - **Soil Layers:** - **Medium Clay:** - Depth: 4.0 m - Shear strength $ f_s = 30 \, \text{kPa} $ - **Stiff Clay:** - Extends from 4.0 m to 15.0 m (11 m thick layer) - Shear strength $ f_s = 60 \, \text{kPa} $ - End bearing capacity $ q' = 2000 \, \text{kPa} $ - **Groundwater Table:** Located 6.5 m below the surface. Determine the downward and upward load capacities based on the factors of safety and soil properties provided.

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