Answer pls. Thankyou 1. Describe the purpose of soil stabilization and discuss atleast three methods ofachieving soil stabilization.2. How does soil stabilization affect highway construction3. How is track modulus expressed? State the factorsaffecting it and give thevalues of at least one of these factors for the tracks in ourcountry.4. Explain the following terms.(a) Track modulus (b) Coning of wheels (c) Tilting of rails (d)Permanent way5. Explain briefly how the pressure created by wheel loads istransmitted through the ballast. What factors of the ballastinfluence the intensity of the pressure on the formation?6. What is the ballast? Why is it used in the railway track?Briefly describe thevarious types of ballasts used.

As per guidelines one need to answer only first question.

Answered: Describe the purpose of soil…

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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(b) The road embankment will be constructed on soft soil. Since the short-term stabilityis more critical than the long-term stability, you, as a geotechnical engineer, arerequired to propose and discuss the related laboratory testing to be performed inorder to analyse the short-term stability of road embankments ?
Define the Correlation between N60 and Relative Densityof Granular Soil ?
describe the main differences between short term and long term stability analysis jn soil mechanics. why is it important to consider both types of analysis in geotechnical engineering?
Classify this soil according to Unified System. Please provide the Group Symbol and the Group Name. How appropriate is this soil as a subgrade material for roadways? Size (mm) 4.75 (No.4) 2 (No.10) 0.425 (No.40) 0.075 (No.200) LL PL % Passing 85 75 34 14 30 14
A 7000 meters long and 8 meters wide road is to be constructed in a remote region. Cut and fill are necessary where there is a poor subgrade soil. Four bulldozers excavated the poor subgrade soils. The dimensions of the excavated trench were 0.8 m deep by 10 meter wide and 3.5 kilometers long. The road will have 100 mm aggregate base and 50 mm of asphalt thickness. A bulldozer displaced 115 m3\day, at a rate of 100 cedis per day. A laterite soil will be used in the fill operation. The fill operation will need a grader, a vibratory roller and a water truck for 20 days each at a cost of 130 cedis, 138 cedis and 68 cedis respectively. Daily labor rates for this excavation operation is a foreman, 30 cedis, five laborers, 15 cedis each. Truck driver, 21 Cedis and grade checker, 26 Cedis. Daily labor rates for the fill operations are the same as the excavation rates. One forman, ten laborers and a truck driver will be employed for the fill operations. Grading and asphalt laying will…
The following figure shows a section of road. During road construction, the fill material has been used obove a natural soil and a thin soft clay layer. Then the fill material has been compacted untill road level. After raining, a failure took place in the road so the section would be unstable. This road is very crowded and should be repaired as soon as posible. What is your solution to improve it? Explain with detail that why you select this method. Failure line River Compacted fill Natural soil Road Soft clay layer
A 7000 meters long and 8 meters wide road is to be constructed in a remote region. Cut and fill are necessary where there is a poor subgrade soil. Four bulldozers excavated the poor subgrade soils. The dimensions of the excavated trench were 0.8 m deep by 10 meter wide and 3.5 kilometers long. The road will have 100 mm aggregate base and 50 mm of asphalt thickness. A bulldozer displaced 115 m \day, at a rate of 100 cedis per day. A laterite soil will be used in the fill operation. The fill operation will need a grader, a vibratory roller and a water truck for 20 days each at a cost of 130 cedis, 138 cedis and 68 cedis respectively. Daily labor rates for this excavation operation is a foreman, 30 cedis, five laborers, 15 cedis each. Truck driver, 21 Cedis and grade checker, 26 Cedis. Daily labor rates for the fill operations are the same as the excavation rates. One forman, ten laborers and a truck driver will be employed for the fill operations. Grading and asphalt laying will require:…
Classify the soil to be used as a highway subgrade material using AASHTO classification system; Liquid limit for soil passing #40 sieve was determine to be 35% and plasticity index was 20% Sieve No. Size opening (mm) % Finer No. 4 4.75 100 No. 10 2.00 93 No. 20 0.850 87 No. 40 0.425 81 No. 60 0.250 63 No. 140 0.140 49 No. 200 0.075 32
A) Being an engineer, what is the role of soil mechanics in highways and bridges? Justify your answer
b) The results of a grading test on a sample of lateritic gravel intended for the sub-base course of a road project are shown below. The Atterberg limit tests gave a liquid limit of 42 and a Plastic Limit of 20. Table 1 for Question 1 Size 37.10 19.00 6.70 3.18 1.18 0.425 0.300 | 0.212 0.075 Percentage passing (%) Plot the grading curve 100.00 91.82 46.17 33.88 28.99 17.43 15.82 14.22 11.72 i) ii) Determine with clear reasons whether the material meets the minimum requirements of the index properties for the sub-base course in accordance with the GHA Specification for T2. What will be your recommendation for using the material? iii)
12. Soil compaction is important information to be controlled during the execution of geotechnical works. An example of problems caused by poor compaction of materials are permanent deformations such as those observed in the existing pavement between Corumbá and the ports of Santos (SP) and illustrated in Figure 1. In an article published on 02/03/2022 in the newspaper Correio do Estado (https://correiodoestado.com.br/cidades/excesso-de-peso-faz-da-br262-uma-rodovia-de-alto-risco/397089) states that "in this region, the base of the landfill is fragile due to account of the inappropriate material used when building the road in the 1980s. Inadequate compaction also caused erosion problems (Figure 2) on the wall built by the United States on the border with Mexico, as published on the official website of the United States Homeland Security at 01/30/2021 (https://www.dhs.gov/news/2021/04/30/dhs- announces-steps-protect-border-communities-wall-construction). Figure 1. Surface sinking…
For a typical road construction which requires soil embankment prior subgrade, what is the proper sequence of activities to properly prepare that layer of soil embankment? Which earthwork equipment should we use in order, from first to last?

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Describe the purpose of soil stabilization and discuss at east three methods of chieving soil stabilization. How does soil stabilization affect highway construction How is track modulus expressed? State the factors ffecting it and give the