代做CIV5147 Advanced Geomechanics Semester Two 2022 Mock Examination调试数据库编程

Semester Two 2022

Mock Examination

Faculty of Engineering

EXAM CODES:                            CIV5147

TITLE OF PAPER:                       Advanced Geomechanics

EXAM DURATION:                    130 minutes + 30 minutes scanning and uploading

TOTAL MARKS:                          100 Marks

THIS PAPER IS FOR STUDENTS STUDYING AT: (tick where applicable)

□ Berwick	√   Clayton	□  Malaysia	□ Off Campus Learning	□ Open
Learning
□ Caulfield	□ Gippsland	□ Peninsula	□ Monash Extension	□ Sth Africa
□ Parkville	□ Other (specify)

During an exam, you must not have in your possession any item/material that has not been authorised for your  exam. This  includes  books,  notes,  paper,  electronic  device/s,  mobile phone, smart watch/device, calculator, pencil case, or writing on any part of your body.  Any authorised items are listed below.  Items/materials on your desk, chair, in your clothing or otherwise on your person will be deemed to be in your possession.

No  examination  materials  are  to  be  removed  from  the  room. This  includes  retaining, copying, memorising or noting down content of exam material for personal use or to share with any other person by any means following your exam.     Failure to comply with the above instructions, or attempting to cheat or cheating in an exam is a discipline offence under Part 7 of the Monash University (Council) Regulations or a breach of instructions under Part 3 of the Monash University (Academic Board) Regulations.

AUTHORISED MATERIALS

OPEN BOOK                                                             √ YES                □  NO

CALCULATORS                                                        □ YES                 √  NO

(Note:  only calculators with an 'Approved for Use' Faculty sticker permitted)

SPECIFICALLY PERMITTED ITEMS                      √  YES               □  NO

if yes, items permitted are:   RULER, COMPASS, PROTRACTOR, GRAPH SHEET

Note: Mock assessment questions are selected from the practice or example problems. The aim of this mock exam is to provide you with guidance about the final assessment process (i.e., become familiar with the online uploading process). To prepare for the final assessment (final exam), you MUST coverall materials taught in this unit.

Q1. A plan view of a rectangular pad footing of 1mx 2m is shown in figure below. The footing is  placed  at  a  depth  of  1  m  below  the  ground  level.  Estimate  the  primary  consolidation settlement of the footing.  Use  2:1  method to  estimate the  incremental stress  below the footing. [Answer: Sc=46 mm]

Q2. Undisturbed soil sample was collected from the field and tested in the laboratory under triaxial loading. The fully saturated clay sample was initially isotropically consolidated using 300 kPa cell pressure and then unloaded isotropically to a mean effective stress of 200 kPa. The  sample  was  then  shared  under  undrained  triaxial  condition.  Assume  λ=0.3,  K=0.05, eo=1.10 and φ’cs=30o.

(a) Calculate M ande Γ for the CSL.  [M=1.2, eΓ  =2.62]

(b) Calculate the yield stresses (p’y, qy), (σ’1, σ’3)y  and excess porewater pressure at yield [Answer: p’y=200kPa, Δuy=56.6 kPa, qy=169.7 kPa; σ’1y=313.3 kPa, σ’3y=143.4 kPa]

(c)  Calculate the failure stresses (p’f, qf), (σ’1, σ’3)f    and excess porewater pressure at failure [Answer: p’f=158.6kPa, Δuf=104.9 kPa, qf=190.4 kPa; σ’1f=285.5 kPa, σ’3y=95.1 kPa]

(d) Establish equations for the NCL, unloading/reloading line, and CSL  [Answers: NCL: e=2.79-0.3lnp’; unloading/reloading: e=1.08+0.05ln(p’c/p’); CSL=e=2.62-0.3lnp’]

(e)  Plot the TSP and ESP stress-paths with the yield surface.

Q3. A soil sample is tested under consolidated undrained (CU) triaxial loading with the soil parameters λ=0.25, K=0.05, eo=1.15, v’=0.3, p’o=200 kPa, p’c=250 kPa and φ’cs=24o. You are asked to calculate the total volumetric and deviatoric strains using MCC model. Use a single elastic and plastic stage for the strain calculation.

[Answers: M=0.94, eΓ=2.38, p’f=138 kPa, qf=129 kPa, p’y=200 kPa, qy=94 kPa, Δuf=105.8 kPa, εq=133x10-3]

Q4. An infinite slope consists of a soil layer 4m thick covering a bedrock inclined at 15oto the horizontal line. The properties of the soil layer are: c’ = 10 kPa, φ'  = 24o  andy =  19  kN/m3. What is the factor of safety of this slope? If there is steady-state seepage through the soil, with the water table coinciding with the ground level, what would be the factor of safety of this slope? Given: ysat  = 20.5 kN/m3.  [Answer: FoS = 2.19 and 1.35]

Q5. The cross-section of a concrete (y=23.58 kN/m3) cantilever retaining wallis shown below. Calculate the factor of safety against overturning, sliding and bearing. Assess these values against     acceptable     values.         {Answer:      FOS(overturning)=2.98,     FOS(sliding)=2.73, FOS(bearing)=3.0].