HNC/HND Construction and the Built Environment 2Higher National Certificate/Diploma inConstruction and the Built EnvironmentAssignment Brief Student Name/ID NumberUnit Number and Title29 Geotechnics & Soil MechanicsAcademic Year2020 – 2021Unit TutorDr. S. ToviAssignment TitleAssignmentIssue Date24th October 2020Submission Date19st December 2020IV Name & DateF. Khan, V.Oke and S. Samad Unit Learning OutcomesLO1 Review rock types,their formation and civil engineeringLO2 Explore and classify soils to current codes of practice.LO3 Analyse soil properties determined by geotechnical procedures.LO4 Produce a proposal to address identified geotechnical weaknesses and problems.Assignment Brief and GuidanceSCENARIOIt is necessary to reopen a mine under the sea to extract potash. There is a flat area on the site near to the beachwhich was used in the past as a logistic center for the mine to bring in supplies and export the potash inland. Thisarea is only about 4 m above mean sea level. The soil below this area is mainly soft sand with some made groundand some ridges of clay. A short distance inland from this area there are some steep rocky hills and two abandonedquarries. You have just started working with this company and are part of the team that is making preparations fordeveloping the mine and the logistics area.Task 1a) State the three main classes of rock and outline the main features of their formationb) Give one example of how each type of rock is used in constructionc) Briefly outline the Bowen Series of rock classification and indicate to what extent this can explain theweathering characteristics of rocksd) What are the most important mechanical characteristics of rocks used in the following situations:i) as foundations for roadsii) as facings for structuresiii) as aggregate for concrete HNC/HND Construction and the Built Environment 3 iv) as building stone.e) Outline where soil is used as a construction material and compare this with alternative materials that couldbe used such as in a damf) Explain the difference in strength between rock mass and the same material taken out of a quarryg) How is this shown in the RQD assessment of rock strength?h) Analyze case studies involving tunneling and the problems posed by the discontinuous nature of rock massTask 2a) Briefly explain what a brownfield site is and how this differs from other sites.b) How would you approach a ground survey in a brown filed site and show how this might differ from aground survey on other sites.c) Explain the difference between a disturbed and an undisturbed soil sampled) Outline the laboratory tests that can be done only on undisturbed samplese) Outline how soils are classifiedf) How is plasticity used in the classification of soils?g) Discuss the sampling of soil in situ giving an example of the measurement of bulk density and also of shearstrength.h) Discuss the relative merits of in situ testing and laboratoryi) Evaluate how much soil sampling is needed in a soil survey on a site and what are the dangers of too little ortoo much sampling?Task 3.a) Outline briefly how you would measure the following from an in-situ sample: soil moisture content bulk density and specific gravityb) Outline briefly a method of measuring shear strength in-situ and one method used in the laboratory. Discussthe limitations of this test with respect to the type of soil under testc) Briefly outline how soil compressibility is measured in the laboratory and discuss the importance of time inthis measurement.d) Outline the principle behind the California Bearing Teste) State how the liquid limit and the plastic limit are measured in the laboratory and state the results weobtained from the laboratory tests carried out.f) The following results were obtained during a test of the liquid limit of a clay rich soil. Calculate the liquidlimit and compare the reliability and reproducibility of this test to the standard test for plastic limit.ConepenetrationmmMoisturecontentgMass ofdry soilgMoisturepercent15 3.46 10.5819 3.86 10.71 HNC/HND Construction and the Built Environment 4 21 4.49 11.7926 3.94 11.9731 5.93 10.57Task 4 Address the problem of keeping the logistic area dry even during the highest tides. Occasionally tides ashigh as 7m above mean sea level area experienced here when there is a Spring tide (a very high tide) together with astrong on shore wind.a) Outline your solution andb) Outline what the geotechnical weaknesses are within the logistics areac) Briefly suggest the site survey neededd) show what foundations are needed to support and protect the area.End of Assignment Advice on presenting this assignment.In Task 1 and in other tasks where you are quoting from published information such as ACOP’s pleasereference your sources using the Harvard Referencing system.This assignment should be presented in the form of a report with each task a new main heading and eachpart of the question a sub-headingDo look at the pass criteria at the end of this assignment, you will see which parts of each task apply to thepass criteria, which to the merit and which to the distinction PassMeritDistinctionLO1 Evaluate rock types, their formation and uses withincivil engineeringP1 Discuss rock typeformation and classification,susceptibility to weatheringand the weatheringprocesses.P2 Analyse thediscontinuous nature of rockmass.M1 Evaluate the use of rockand uncemented sedimentswithin civil engineering.D1 Critically analyse example thataddress problems caused by thediscontinuous nature of rock masswhen tunnelling and constructingbridges, using case studies asexamples. HNC/HND Construction and the Built Environment 5 LO2 Explore and classify soils to current codes of practiceP3 Explore methods andtechniques used in groundand site investigation, soilsampling, soil descriptionsand soil classifications tocurrent codes of practice.P4 Explore how soils areclassified from soil particlesize, soil types, specificgravity and plasticityindices to current codes ofpractice.M2 Evaluate methods andtechniques used in groundand site investigation andsoil sampling.D2 Assess the importance ofsite investigation, soil samplingand determination ofsoil properties for infrastructureprojects. PassMeritDistinctionLO3 Analyse soil properties determined by geotechnicalproceduresP5 Evaluate how soilproperties are determined,including moisture content,density, specific gravity,shear strengthcompressibility, liquid andplasticity indices,California bearing ratio.M3 Analyse results fromsoil properties testing.LO3 LO4D3 Integrate test data to inform thedevelopment of design proposals.LO4 Produce a proposal to address identified geotechnicalweaknesses and problems HNC/HND Construction and the Built Environment 6 P6 Produce designproposals to addressgeotechnical problemsrelated toembankments, bridgeand road foundations fora given site.M4 Justify the approach to adesign proposal in meetingidentified geotechnicalweaknesses.
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