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School of Engineering and the Built Environment MOD002372 Geotechnical Engineering The assessment for this module consists of one report to be submitted to Turn It In by 14:00 on the 22ndMay 2020. Answer all parts. The company you work for is involved with the construction of a commercial development. As a recent graduate you are keen to experience as many aspects of the work as possible and as a result your line manager has given you access to some of the site investigation data from one part of the site (Figure 1) and has asked you to carry out preliminary studies into the following: 1. A number of deep excavations are to be carried out and this will involve lowering the groundwater over an extensive area by 3m for the two year duration of the project. You have been tasked with estimating the predicted settlements this might cause on the land adjacent to the construction site. Appendix 1 contains information about this task. 2. A retaining wall is required to replace a slope and retain soil under a staff car park. Make recommendations about what type of retaining wall would be appropriate and carry out the relevant stability checks. Appendix 2 contains information about this task. 3. A single story, steel framed warehouse is to be constructed. Each column will transmit load to a pad foundation. The structural engineers estimate that the variable actions from a central column will be 350kN and the permanent action will be 760kN. Determine the size of a central footing and estimate the immediate settlements generated by the application of the loads. Appendix 3 contains information about this task. Clearly explain and discuss all the assumptions that you make throughout your analysis. Figure 1 Appendix 1 Client: T&Y Partnership Date: 18/02/2020 Location: South Rd, Flipton BH24 Job No : C7452 Boring Method: Cable Percussive Sheet 1 Additional information Description Depth Top soil 0.5m Legend 𝜌 = 1.9𝑡/𝑚 ; 𝜌 = 2.0𝑡/𝑚 Medium dense SAND 3.1m 𝜌 = 1.96𝑡/𝑚 Dark grey BOULDER CLAY 8.3m Dark grey, slightly weathered fine grained MUDSTONE 20 Sample height (mm) 19.5 19 18.5 18 17.5 17 1 10 100 Stress (kPa) Oedometer test results for the Boulder Clay 1000 Appendix 2 Client: T&Y Partnership Date: 27/02/2020 Location: South Rd, Flipton Job No : C7452 Boring Method: Cable Percussive BH72 Sheet 1 Additional information Description Top soil Depth Legend 0.5m 𝛾 = 18.2𝑘𝑁/𝑚 ; 𝜙 = 25. 5 Medium dense SAND 8.3m Dark grey BOULDER CLAY 10.1m Dark grey, slightly weathered fine grained MUDSTONE Sketch of proposal Car Park 5m Appendix 3 Client: T&Y Partnership Job No : C7452 Boring Method: Cable Percussive Date:31/02/2020 Location: South Rd, Flipton BH07 Sheet 1 Additional information Description Depth Top soil Legend 0.5m Medium dense SAND 𝜙 = 19. 7 ; 𝛾 = 17.8𝑘𝑁/𝑚 1.3m 𝜙 = 17. 8 ; 𝑐 = 3.6𝑘𝑃𝑎; 𝛾 = 20.2𝑘𝑁/𝑚 Dark grey BOULDER CLAY 𝜏 = 43𝑘𝑃𝑎 8.3m Dark grey, slightly weathered fine grained MUDSTONE Modulus of Elasticity (E'o) (MPa) 0 0 Depth from surface (m) 1 2 3 4 5 6 7 8 9 2 4 6 8 10 Marks Scheme Pt 1 Pt 2 Pt 3 Problem clearly defined, Analysis chosen is appropriate Calculations carried out accurately Additional analysis e.g. what happens when GWL returned to previous level Assumptions and limitations clearly explained and discussed Problem clearly defined, Wall type and size is appropriate Safety checks are carried out accurately Additional analysis e.g. analysis of different wall type Assumptions and limitations clearly explained and discussed Problem clearly defined, Pad placement and size is appropriate Calculations carried out accurately using EC7 and drained and undrained cases analysed. Settlement calculations carried out accurately Additional analysis e.g. different shapes of pad analysed Assumptions and limitations clearly explained and discussed Marks available 15 25 25 15 20 100 15 25 25 15 20 100 15 10 20 20 15 20 100 ...
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