# I need help with my lab report with only 2 questions. Class is :Geotechnical engineering lab

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Engineering

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Question 1 band 3 a

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Report Sections: 1. Introduction a. A short paragraph that describes the purpose of the lab. b. A paragraph on the importance of understanding how the grain size distribution affects the engineering behavior of sands and gravels. Use textbooks (not the web), to support your statements (list the references you cited). There are many textbooks and journals in the SDSU library. Particularly useful textbooks for this particular lab are Terzaghi and Peck, Lambe and Whitman, and Taylor. Show the reader that you are knowledgeable on this particular concept of Geotechnical Engineering, 2. Force balance. a. The force balance plot, as described previously. That is, a curve for Fvpw as a function of d (mm) and a curve for Fg as a function of d (mm); both curves in the same plot. On the x-axis, plot particle diameter d (in mm). Scale the x-axis from 0.001 mm to 10 mm. On the y-axis, plot both FVDW and FB. For clarity, change both axes to log-scale. What do you see? In one paragraph, explain how and why this plot reveals the importance of size (d) on the force balance that a particle experiences. 3. Grain size distribution. a. Plot the grain size distribution of your soil perfectly. Describe the GSD in one paragraph b. Make a table with the following i. The fines content (in percent) ii. The effective grain size (d:o) iii. The mean grain size (do) iv. The coefficient of uniformity (Cu = d.o/d10) ...do not forget units! 4. References (list them). You should have more than 2. See rules #7 and #8 on page 7 of this reader. 21 5. Hand and spreadsheet calculations. Report Sections: 1. Introduction a. A short paragraph that describes the purpose of the lab. b. A paragraph on the importance of understanding how the grain size distribution affects the engineering behavior of sands and gravels. Use textbooks (not the web), to support your statements (list the references you cited). There are many textbooks and journals in the SDSU library. Particularly useful textbooks for this particular lab are Terzaghi and Peck, Lambe and Whitman, and Taylor. Show the reader that you are knowledgeable on this particular concept of Geotechnical Engineering, 2. Force balance. a. The force balance plot, as described previously. That is, a curve for Fvpw as a function of d (mm) and a curve for Fg as a function of d (mm); both curves in the same plot. On the x-axis, plot particle diameter d (in mm). Scale the x-axis from 0.001 mm to 10 mm. On the y-axis, plot both FVDW and FB. For clarity, change both axes to log-scale. What do you see? In one paragraph, explain how and why this plot reveals the importance of size (d) on the force balance that a particle experiences. 3. Grain size distribution. a. Plot the grain size distribution of your soil perfectly. Describe the GSD in one paragraph b. Make a table with the following i. The fines content (in percent) ii. The effective grain size (d:o) iii. The mean grain size (do) iv. The coefficient of uniformity (Cu = d.o/d10) ...do not forget units! 4. References (list them). You should have more than 2. See rules #7 and #8 on page 7 of this reader. 21 5. Hand and spreadsheet calculations.
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1

Civil Engineering 463
Geotechnical Engineering Laboratory
July 25th, 2017
Members
Miranda McNeilly
Mallika Guda
Douaa Redha
Ali Jasim
Vicky Lau

Introduction

2

a. The sieve analysis, or the gradation test, is a practice or procedure used to assess the particle size
distribution, which is also called gradation of a granular material. The grain size distribution is often of
critical importance to the way the material performs in use. A sieve analysis can be performed on any
type of non-organic or organic granular materials, including sands, crushed rock, clays, granite,
feldspars, coal, soil, a wide range of manufactured powders, grain and seeds, down to a minimum size
depending on the exact method. Being such a simple technique of particle sizing, it is one of the most
common.

b.
The grain size distribution of soils is a very important parameter which lets us to classify the soils in most basic
form. Sands and gravels are two such types. From the complete grain-size distribution curve, we can obtain two
types of information which is:
1. Grading characteristics, which indicate the uniformity and range in grain-size distribution.
2. Percentages (or fractions) of gravel, sand, silt and clay-size. (Terzhagi & Peck, 1996)
By grain size distribution, we get to understand the initial engineering properties such as permeability, shear
strength, compressibility etc. As of today, we do not have a single great parameter that can define an entire
grain size distribution which is why we use statistical tools such as mean, median, standard deviation, the
coefficients of uniformity and curvature, fines content, effective particle size etc., in order to explain the general
slope and shape of the grain size distribution curve in geotechnical engineering studies. Grain size distr...

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