E2445 Soil mechanics IV CIVL4320 Advanced soil mechanics Assignment 1 – Retaining wall © Dr Robert Day, The University of Queensland, 2018 CIVL4230 Advanced soil mechanics Assignment - Retaining wall...

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E2445 Soil mechanics IV CIVL4320 Advanced soil mechanics Assignment 1 – Retaining wall © Dr Robert Day, The University of Queensland, 2018 CIVL4230 Advanced soil mechanics Assignment - Retaining wall Purpose: To compare different methods of design of a sheet pile retaining wall Assignment Due: Refer to the course profile Introduction: The alignment of a new road requires a permanent cutting of varying depth. Because of restrictions to the width of land available for the road, a permanent concrete retaining wall is required to support the cutting. The contractor building the wall wants to construct a temporary steel sheet pile wall to facilitate easy access for construction of the concrete wall (see figure). You are a consultant advising the contractor on the design of the sheet pile wall. Problem definition:  Additional data is provided on the next page.  Give your design for BOTH: 1. A cantilever wall which may be used for heights up to of 3.3 m constructed entirely within the surface gravel layer. AND 2. A propped wall (shown above) for a retained height of 9.0 m For the cantilever wall design  Calculate the required depth of embedment using each of the following four analysis/design methods: Factor of safety methods: o the simplified pressure distribution and Fp = 2 o the more simplified pressure distribution and Fp = 2 Limit state design methods: o the simplified pressure distribution and  = 0.85 and LF = 1.25 and 0.8 o the more simplified pressure distribution and  = 0.85 and LF = 1.25 and 0.8  If the length of the wall turns out to be more than 8 m, ignore the fact that the toe is actually in the sand.  Calculate the Serviceability Limit State bending moment. This is the same regardless of the above method used.  Calculate the Ultimate Limit State bending moment (for structural design) corresponding to each of the 4 analysis/design methods above.  Select a suitable sheet pile from the table below assuming: o Yield stress, fy = 270 MPa o ULS capacity,Ms = 0.9 fy Z (I.E.  for structural design = 0.9)  Briefly (no more than a few sentences or dot points) comment on the different results obtained from the different methods of analysis.  Summarize your results and comments on the Results Summary Sheet below. 9.0 m 2.0 m 8.0 m Gravel  = 38o Sand  = 30o Ground water level Permanent concrete wall Temporary sheet pile wall CIVL4320 Advanced soil mechanics Assignment 1 – Retaining wall © Dr Robert Day, The University of Queensland, 2018 For the propped wall  Use the geometry shown above and the Limit State Design method.  Using the free earth method with  = 0.85, and LF = 1.25 and 0.8 calculate: o the length of the sheet pile wall required for stability. o the maximum ultimate bending moment (ULS) in the sheet piles.  Calculate the maximum serviceability limit state (SLS) bending moment.  Calculate the design anchor force (SLS and ULS) in the anchors.  Select a suitable sheet pile from the table below (use fy = 270 MPa andMs = 0.9 fy Z). Additional data for all designs  Take the bulk unit weight b of all soil types to be 20 kN/m3  Assume wall friction equal to '/2 on both sides of the wall. (Use the Caquot and Kerisel earth pressure coefficient tables)  Ignore the vertical component of earth pressure (due to friction on the back of the wall).  Sheet pile wall section properties are given below. Summarize your results on the attached summary sheet. This will help you to compare and reflect on the differences between the methods. Assessment criteria – Assignment 1 Criteria Unsatisfactory / Poor 0 – 50% Sound 50% – 75% Good / Excellent 75% - 100% Process Intention unclear. Difficult to understand. Lack of understanding of problem and theory. Calculation methods generally correct. Poorly demonstrated and difficult to follow. Well presented and correct. Clearly set out. Easy to follow. Demonstrates understanding of problem and theory. Accuracy No solution to some problems Few solutions correct within normal engineering accuracy. Solutions to most or all calculations correct within normal engineering accuracy. Discussion Superficial discussion. Fails to explain or understand the issues. Reasonably clear discussion. Little understanding of issues. Clear, in depth and concise discussion of issues. Demonstration of insight and good understanding of issues and methods. CIVL4320 Advanced soil mechanics Assignment 1 – Retaining wall © Dr Robert Day, The University of Queensland, 2018 CIVL4320 Advanced soil mechanics Assignment 1 – Retaining wall © Dr Robert Day, The University of Queensland, 2018 CIVL4230 Advanced soil mechanics Assignment 1 - Retaining wall Results summary sheet This sheet must be completed and attached as the first page of your submission (under the EAIT central assignment submission cover sheet). Cantilever wall design L – Length of wall (depth of embedment + retained height); BMSLS – Max bending moment – Serviceability Limit State; BMULS – Max bending moment – for Ultimate Limit State design of the pile section Simplified pressure distribution More simplified pressure distribution Factor of Safety method L L BMSLS BMSLS BMULS BMULS Section Section Limit State Design Method L L BMSLS BMSLS BMULS BMULS Section Section Comments: Propped wall design Limit State Design Method L Length of wall (depth of embedment + retained height PSLS Prop force (1.85 x value from the limit equilibrium calculation) PULS Prop force for Ultimate Limit State structural design BMSLS Max bending moment – Serviceability Limit State BMULS Max bending moment – for Ultimate Limit State design of the pile section Section