30. The proposed embankment fill requires 8000m³of compacted soil. The void ratio of the compacted fill is specified as 0.70. Four borrow pits are available as described in the following table, which list the respective void ratios of the soil and the cost per cubic meter for moving the soil to the proposed construction site. Assume that the specific gravity is the same at all pits, which among the pits should be bought to minimize the cost? Borrow Pit Void Ratio Cost (P/m³) A 0.82 400 B 0.9 450 1.1 250 D 0.78 600

30. The proposed embankment fill requires 8000m³of compacted soil. The void ratio of the compacted fill is specified as 0.70. Four borrow pits are available as described in the following table, which list the respective void ratios of the soil and the cost per cubic meter for moving the soil to the proposed construction site. Assume that the specific gravity is the same at all pits, which among the pits should be bought to minimize the cost? Borrow Pit Void Ratio Cost (P/m³) A 0.82 400 B 0.9 450 1.1 250 D 0.78 600

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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A Soils laboratory technician carries out a standard Proctor test on an SP-type soil and observes, at low water content, a decrease in unit weight with increase in water content.Why does this occur? Plot the compaction curve you expect to be derived from this test. How should the technician proceed, and with what aim?
4.16 Plot the particle size distribution curve for each of the three soils the data for which are given below. All three curves should be on the same semi logarithmic diagram. Sieve Number 3/4 in ½ in #4 # 10 # 20 # 40 # 60 # 100 # 200 Particle Diameter from Hydrometer Analysis (mm) Lagoon Clay Beufort, SC 0.045 0.010 0.005 0.001 Data from Sowers (1979). 100 100 100 100 100 100 100 95 80 61 42 37 27 % Passing by Weight Beach Sand Daytona Beach, FL 100 100 100 100 100 98 90 10 2 Weathered Tuff Central America 100 98 95 93 88 82 75 72 68 66 33 21 10 4.17 Determine Cu and Ce for each of the three soils in Problem 4.17. Which of these soils is most well-graded? Why?
A field density test has been conducted in a compacted fill that is currently under construction.The test results indicate a relative compaction of 101-103%, which made the constructionmanager believe the test must be incorrect. He believes it is impossible for the dry unit weightinthe field to be greater than the maximum dry unit weight from the Proctor compaction test.Explain why the relative compaction in the field could indeedbe greater than 100%.
1. The following results were obtained from particle size distribution analysis of three soils - A, B and C. Sieve # 1/2 in 3/8 in #4 # 10 #40 #100 #200 Diameter (mm) 12.5 9.5 4.75 2 0.425 0.15 0.075 0.02 0.003 0.001 WL (or LL, liquid limit) wp (or PL, plastic limit) w (natural water content) Soil A 100 96 89 82 67 57 47 28 8 Percent passing Soil B 3 25 16 11 100 98 82 33 12 5 5 Soil C 100 99 97 85 55 43 51 19 26.5 Required: (1) Plot the particle size distribution curves (semi-log). Determine the following quantities of each soil: the effective particle size dio, the mean particle side d50, the coefficients of uniformity and curvature (if possible). (2) According to the particle size distribution, when the engineering properties are concerned, which soil is the most sensitive to water and which soil is mostly affected by density? Give you logic. (3) Classify the soils according to the USCS.
The sieve analysis of ten soils and the liquid and plastic limits of the fraction passing through the No. 40 sieve are given below. Classify the soils using the AASHTO classification system and give the group indexes. % Passing No. 10: 100 % Passing No. 40: 78 % Passing No. 200: 8 LL = - PL NP (Non-Plastic) Group classification: Blank 1 Group index: Blank 2 Blank 1 Add your answer Blank 2 Add your answer
A pit of volume 16x104 cum is to be filled in such a way that its void ratio comes out to be 0.75. If the soil to be borrowed has void ratio of 1.5 then determine the volume that should be extracted.
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Q1: Use the USCS to Classify the soil sample with the following data: % passing 4.75 mm Sieve = 64 % passing 75- Sieve =4 Uniformity Coefficient= 7.5 Coefficient of Curvature=2.7 Plasticity index = 2.5 Solution: Q2: Use the USCS to Classify the soil samples with the following data dalla Soil LL PL Group Symbol Soil Name 15 35 25 ABC 8. ८८ 25 45 65 2-Seepage velocity (m/s) = 70 3- Flow rate in (m3/s) = oss and dry ng www Parmbly & volume change decrease Campering wes Toughness and dry strength dease Presby & val change in 10 20 30 40 50- 60 Liepakt. 70 80 Atra -0.73 (W₂-201 90 Q3: For the soil shown below the hydraulic conductivity is (3 m/day). The sample diameter is 1.5 m. The porosity is (30%). Find: 1- Flow velocity (m/s)== 100 110 120 Soil 4 m ITE
4. Determine the USCS designation and soil description of a soil sample given the following sieve analysis test results: D10 = 0.2 mm = D30 0.73 mm D60 3.35 mm % passing #4 = 77.5 % passing #200 = 9.5 The fines are silty.
From the particle size distribution curve, about 61% of the oil is finer than 0.074 mm in diameter. The liquid limit and plastic limit of minus No 40 fraction of the soils are as follows: LL =26, PL= 20. Classify the soil using the USCS.a. CL-MLb. CL-MLc. SP-SCd. CH
6. It is required to transport a soil from a source location to the construction site. The specific gravity of the soil is 2.65 and the water content is measured as 10%. The capacity of the trucks, that will be used to transport the soil, is 20,000 kg. If the volume of soil placed in each truck is 9m³, what should be the minimum void ratio so the capacity of the truck is not exceeded.