The plan, section, and notes describe landsliding which has occurred affecting the railway line near Coalcliff, north of

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The plan, section, and notes describe landsliding which hasoccurred affecting the railway line near Coalcliff, north ofWollongong. Also attached are some laboratory test results fromthat site, and a nearby site in similar geological conditions.There are two potential slide surfaces: ABCDEF, the lower slidesurface, of which BC is parallel to the claystone bedding (along abedding surface shear); CD is across the claystone bedding; AB andDE are in talus; and EF is in ash fill. ABDEF, in which BD is inclaystone across the bedding in the claystone and AB, DE, EF are asfor the other surface. The landslide moves when the piezometriclevel reaches the peak groundwater level surface “W”. Based on thisinformation: PART 1 (24 marks) (a) From the laboratory test data,determine the effective stress shear strength parameters you feelare appropriate for: (i) the failure surfaces AB, DE (Talus) and EF(ashfill) (ii) the failure surfaces BC (iii) the failure surfacesBD and CD. (b) Analyse the factor of safety of ABCDEF and ABDEFusing your parameters and the peak groundwater level. (c) Useback-analysis methods to refine your estimates of the shearstrengths for the surface (ABCDEF or ABDEF) you consider to be thecritical one. To do this assume the laboratory strengths arereliable for the Talus, Ash, and along BC (parallel to bedding). Inother words, use the back-analysis to determine the strengths oneither BD or CD, depending on which surface you deem to becritical. PART 2 (16 marks) Design, including carrying outstability analysis, a stabilization method for the landslidesufficient to give a factor of safety of at least 1.4 for eachsurface. Your design should incorporate sub-surface drainage ANDcutting and filling. The railway cannot be moved, and must stayopen for all the time remedial works are under construction.Include a plan and section (marked up on the plan and sectionprovided) of your remedial design, along with details of theconstruction of the remedial works and difficulties you expect toencounter. In planning your design, consider stability duringconstruction of the remedial works. PARTS 1 and 2. Stabilityanalysis should be done using slopeW or similar or a program youuse at work. You must include the results of the analysis withproperties assumed shown on the diagrams showing the result.Include the results of the various trials used in theback-analysis.