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SEV200 Geotechnical investigation and Design

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A1 – Geotechnical reportSEV200 { Geotechnical investigation and DesignLast update: 25/02/2020Contents1 Introduction 12 Scenario 13 Requirements 23.1 Laboratory tests . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.2 Site classification . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.3 Line of optimum . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.4 CBR contours and discussion . . . . . . . . . . . . . . . . . . . . 33.5 Compaction plan . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.6 Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Submission 51 IntroductionThis assessment task is a team project. It simulates some of the steps involvedin a real geotechnical investigation for both structures and roads. It also takesa step further to motivate you to study special behaviours of clayey soils to beable to evaluate and substantiate your test results.The aim of this assessment is to help you further develop and demonstratethe following skills:• Working with relevant Australian Standards or simplified versions of them• Performing standard tests and analyse the results• Team work and project management• Critical thinking and visualisation• Literature review• Report writing2 ScenarioA greenfield near CITY1 is being investigated for development. There are plansto build a residential area, a shopping centre and the necessary road network.A schematic figure of the development plan is shown in Fig. 1.Figure 1: Schematic figure showing the development plan.A typical geotechnical investigation involves a number of steps:1. Initial visit to the site2. Sampling and field tests3. Laboratory tests and analysing the results1The name of the city for each group will be provided to them after registration.14. Compiling a reportYou are to complete steps 3 and 4. You are also required to provide some advicefor construction and design of roads on this site. The requirements are explainedin further detail in separate subsections under section 3.Due to the challenges and limitations involved in arranging a proper learning activity in an educational setting, we will ignore the initial site visit andsampling part.3 Requirements3.1 Laboratory testsIn all the required laboratory tests, you would use the same soil which is collectedby digging a pit (disturbed sample) at the project site. This is the first soillayer in the field when the top soil is removed. We might refer to this sampleas subgrade which is the terminology used in road and pavement.You will need to classify this soil, find its compaction parameters, and itsCalifornia Bearing Ratio (CBR). This involves completing the following tests inthe soil lab:1. Sieve analysis2. Atterberg limits3. Compaction test4. CBR (unsoaked)The subgrade is fine-grained which requires special preparation for differenttests, including a curing period for compaction and CBR. In the first sessionof your laboratory tests, you would need to prepare the testing material. Also,as the subgrade is fine-grained wet sieve analysis is appropriate which includeswashing the sample through sieves.On-campus teams are to attend a lab session in week 2 to go through a labinduction and prepare their materials. For the rest of the tests, the on-campusgroups need to book the required sessions from the available options through anon-line booking system. Cloud teams will complete their lab tests during theintensive week (week 7).All groups should submit their compaction and CBR measurements to ashared folder (available to all groups) shortly after completing those tests. Thisdatabase of the results will be updated each time a group completes one of thesetests and it will be finalised by the end of the intensive week (week 7). Testingparameters would be slightly different for each group (see sections 3.3 and 3.4)and by sharing the results, we will be able to gather a reasonably large set oftest data covering a reasonably wide range of parameters. From this data setsoil behaviour at different moisture contents and different compaction levels canbe studied.23.2 Site classificationUsing your test results, you need to classify the site based on AS2870 (2011).This might require making some additional assumptions about soil propertiesand the site. The location of the city is important for site classification.In this part of the report, it is important that you can make reasonableassumptions and justify them. This part of the report will help us assess yourengineering judgement (critical thinking) and use of Standards.3.3 Line of optimumIn practice, compaction tests are typically completed at two pre-defined compaction energy levels (known as standard and modified). However, in this assessment different groups will be required to complete the compaction test atvarious energy levels. This will allow us to further study the compaction behaviour of the sample under a wide range of compaction energies.Each group will be responsible to create and share one compaction curve ata certain energy level. Combining all the curves, all can obtain the so-calledline of optimum by connecting the peak of different compaction curves.3.4 CBR contours and discussionEach group will be required to complete one unsoaked CBR test at a givenmoisture content and dry density. CBR results will be shared among all groups.Using collective compaction and CBR test results, you need to plot theCBR contours (see AGPT02-17 2017, Fig. 5.1) for the subgrade and discuss therelationship between CBR, moisture content, and dry density of the soil2.This task will require some research, particularly a basic literature review onCBR sensitivity to moisture content and overcompaction. You need to explainthe collective lab results for compaction and CBR in light of your literaturereview. Obviously, you can (and are strongly encouraged to) complete thisliterature review prior to completion of the lab tests.The outcome of this research together with the collective lab results willenable you to suggest a design CBR (AGPT02-17, 2017, x5) for an assumedequilibrium moisture content. You need to justify your selection of this assumedequilibrium moisture content.The outcomes of this task also help you decide on a number of factors inyour compaction plan (section 3.5).3.5 Compaction planUsing collective test results and your research and previous discussions, youneed to provide a complete plan for compaction of roads’ subgrade in the site.The following list shows the most important items that you have to discuss inyour compaction plan:1. Machinery to be used for compaction.2. Acceptable range for moisture content for compaction.2Hint: It would be instructive to include the line of optimum on the CBR contour graph.33. Acceptable range for dry density after compaction.You have to substantiate your choices to the items above.Apart from the items above, you can also improve your proposal by addressing the following questions:1. Should we use any stabilisation technique? What do you suggest and why?2. What should be the thickness of layers when compacting a fill?3. How to bring down the moisture content in the field to the acceptablerange after a rain?4. How to ensure the compaction is satisfactory? What tests are to be performed?5. Testing regime for quality assurance. How many tests and how frequentlyshould be performed?6. Apart from moisture content and dry density, are there any other parameters that should be controlled for compaction?3.6 ReportYou need to compile your results and outcomes in form of a geotechnical report.In your report you should include a summary, an introduction, soil classification,site classification, compaction test results, CBR contours and literature review,and compaction plan as explained above. Your report should be professionallywritten and organised, with correct citation and cross referencing style.The minimum formatting requirements for this report are as follows:1. The report should be typed on A4.2. The cover page should include the group name and all the members’names.3. Table of content (this can be included on the cover page like this document).4. Pages should be numbered.5. Margins should be reasonable, i.e. not smaller than 1 cm or larger than5 cm on any side.6. Figures and tables should be numbered and have captions. For figures,captions should be placed below them, and for tables, captions shouldbe placed above them. There shouldn’t be a page break between a Table/Figure and its caption.7. Sections and subsections should be numbered.Total pages of the report (excluding cover page, references, and any appendices) is strictly limited to 15 pages.44 SubmissionThe completed report should be submitted to an electronic drop box on the unitwebsite by the end of week 9, i.e. no later than 9:00 am on Monday 18 May2020. It should be noted that no extension will be approved for this assessmentitem and the drop box will be closed on Monday, 18 May 2020.The report should be submitted as a single file in PDF format.ReferencesAGPT02-17 (2017). Guide to Pavement Technology Part 2: Pavement Structural Design. Austroads, Sydney, Australia.AS2870 (2011). Residential Slabs and Footings. Standards Australia, Sydney,Australia.5
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