### Standard Penetration Test in Coarse Sand**Context:**A standard penetration test (SPT) was conducted to assess soil properties in coarse sand at a depth of 16 feet below the surface. The SPT is a widely used method for estimating the density and mechanical properties of subsurface materials, typically in geotechnical engineering and soil mechanics.**Procedure and Results:**- **Testing Depth:** 16 feet below ground level- **Blow Counts (N-values):** - 0-6 inches: 4 blows - 6-12 inches: 6 blows - 12-18 inches: 6 blows- **Total Blow Count:** The sum of the blow counts is 4 + 6 + 6 = 16 blows.- **Equipment Used:** - **Hammer Type:** USA-style donut hammer - **Borehole Diameter:** 6 inches - **Sampler:** Standard sampler with liner installed- **Soil Condition:** - **Vertical Effective Stress:** 1500 pounds per square foot (lb/ft²)**Objective:**Determine the corrected blow count, \( N_{60} \) which accounts for the overburden pressure and hammer energy efficiency adjustments.**Explanation:**The **Standard Penetration Test (SPT)** measures the resistance of soil to penetration by a standard sampler driven into the ground by a series of hammer blows. The number of blows required to drive the sampler a certain distance (typically 18 inches) is recorded as the blow count (N-value). This value helps in evaluating soil properties such as density, strength, and compaction.To calculate the corrected SPT N-value, known as \( N_{60} \), adjustments are made to the raw N-value to account for factors like:1. **Energy Efficiency:** Different hammers and procedures might deliver energy differently to the sampler. The correction factor typically used is 0.6 for a donut hammer.2. **Overburden Pressure:** The effective stress at the test depth influences the resistance of the soil.To determine \( N_{60} \):\[ N_{60} = N \times (E_r / 60) \]where \( N \) is the raw N-value (cumulative blow count for the last 12 inches of penetration), and \( E_r \) is the hammer energy ratio, assumed to be 60%

Solution: Given data:- Depth = 10' (4.87m) Depth No. of blows 0-6'' 4 6-12'' 6 12-18'' 6…

A standard penetration test has been conducted on a coarse sand at a depth of 16 ft below the surface. The blow counts obtained in the field were as follows: 0-6 in. (4 blows), 6- 12 in. (6 blows), and 12-18 in. (6 blows). The tests were conducted using a USA-style donut hammer in a 6 in. diameter boring using a standard sampler with the liner installed. The vertical effective stress at the test depth was 1500 lb.ft’. Determine N1.

A standard penetration test has been conducted on a coarse sand at a depth of 16 ft below the surface. The blow counts obtained in the field were as follows: 0-6 in. (4 blows), 6- 12 in. (6 blows), and 12-18 in. (6 blows). The tests were conducted using a USA-style donut hammer in a 6 in. diameter boring using a standard sampler with the liner installed. The vertical effective stress at the test depth was 1500 lb.ft’. Determine N1.

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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