CEB323-T1-S2-2004

CEB323-T1-S2-2004 - GUT Student Number Surname Given Name/s...

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Unformatted text preview: GUT Student Number Surname Given Name/s Examination Paper SEMESTER: SECOND SEMESTER EXAMINATIONS 2004 UNIT: CE8323 TRANSPORT ENGINEERING 1 — THEORY 1 DURATION OF EXAMINATION: PERUSAL: 10 MINUTES WORKING: 3 HOURS EXAMINATION MATERIAL SUPPLIED BY THE UNIVERSITY: EXAMINATION BOOKLETS — SIX (6) PER STUDENT GRAPH PAPER MM - TWO (2) PER STUDENT EXAMINATION MATERIAL SUPPLIED BY THE STUDENT: WRITING IMPLEMENTS CALCULATORS - ANY TYPE INSTRUCTIONS TO STUDENTS: Students are prohibited from having mobile phones or any other device capable of communicating information (either verbal or written) in their possession during the examination NOTES MAY BE MADE ONLYON THE EXAMINATION PAPER DURING PERUSAL TIME SIX (6) QUESTIONS ONLY ARE TO BE ATTEMPTED ATTEMPT EACH QUESTION IN A SEPARATE EXAMINATION BOOKLET ALL QUESTIONS ARE OF EQUAL VALUE THIS EXAMINATION PAPER MUST NOT BE REMOVED FROM THE EXAMINATION ROOM Queensland University of Technology GUT GUT Gardens Point Kelvin Grove 1 Commence each question on a new page in the examination booklets. QUESTION 1 (20 marks) (a) Explain the following tests (including testing procedure, use in pavement design and factors affecting the results — half a page for each test): 0) California Bearing Ratio (ii) Repeated Load Triaxial (iii) Ten Percent Fines (9 marks) (b) Calculate the design reliability loading for a pavement with asphalt surfacing for the following: Traffic data: Environment: Roadway: Surveyor’s note: Traffic growth: Lane distribution factor: ESA conversion factors: Design period: Reliability factor: GF = {(1 + r)r1 — l}/r Daily average, one direction: 2 axle rigid 350 3 axle rigid 180 4 axle rigid 12 3 axle articulated 120 4 axle articulated 28 6 axle articulated 50 Main street connecting two towns. Two through lanes, dual carriageways. As much as 40% of the 3 axle articulated category included cars with trailers. 4% pa. Outer lane: 0.9 See Table l. 20 years 4.5 Inner lane: 0.3 (7 marks) A thin asphalt pavement is to be built on top of an embankment. Design traffic loading for 20 . year design life is 5 x 106 ESAs. Functional class = 3. Initial roughness = 60 counts/km. Terminal roughness: See Table 2. The thickness of the granular base will be fixed at 400 m (using Fig. 2). (1) Determine the required CBR of the compacted embankment material. (ii) If the only available source of soil for the embankment is known to produce CBR values of around 4%, discuss what can be done about it. (4 marks) - Question 1 continued overleaf ~ CEB323TlD42 conUU. — Question 1 continued - Number of uivalen: Standard Axles er Vehicle (Typical Values "Specific Sites Ran e Measured Rump "Urban: -- Vehicle Classes 1 l N Medium ignng vehicles '2 axle rigid truck ’3 axle rigid truck 4 axle rigid truck Long Vehicle; ‘3 axle articulated vehicle Z "4 axle articulated vehicle ' '5 axle articulated vehicle g "6 axle artiCulated vehicle Medium ten th combination ve icles (include double road trains and rigid truck/trailers Table l NAASRA Road Terminal Roughness Functional Class“ NAASRA counts-“per km KWXMWWNM&W~W»M*.m—nv -.__4 _ 1 anti 2 110 V3 and 6 £50 4, 5, 7’. 8 and 9 175 1 Wu,«kw/4mxw.wc«cwuwwww.WWW«,~~._.._._....__.—__~_._“WWWW 1 For «definition of Classes see Appendix: A Table 2 — Question 1 continued overleaf — CEB323T1.042 cont/... - Question 1 continued - Thickness of Granular Material (mm) CEB323T1.042 Ratio Terminal/initial Roughness Modi fled Design Traffic Fig. 1 G 100 200 i. ll m 300 “mu-— __ 15 10 400 5cm . a=i-H-=im 7 .41.". -=i: Ea . gain 3’3 “ii-E ' r f- 76 379% ' ' Dé‘sign-fi‘iafiiiz’iififii’f' Fig. 2 cont/. i. QUESTION 2 (20 marks) A 580 mm thick sprayed seal pavement is designed using CHEV4 program (results shown in Table 7). Design traffic (20 years) = 5 x 107 ESAs. Initial surface roughness = 55 counts/km. Functional class = 6. Subgrade: Heavy clay, Liquid limit = 70, Plastic limit = 30, low water table, average construction conditions (see Table 3). Granular material: Class 2 crushed rock, standard compaction. Assumed isotropic. (i) Sketch the pavement cross section showing the sublayer thicknesses, moduli and Poisson’s ratio values (use Table 4, 5 and 6) (9 marks) (ii) Discuss the importance of sublayering in an analytical pavement design. Explain Why sublayering is needed in this case. When sublayering is not required? (3 marks) (iii) Discuss material anisotropy and its effect(s) in pavement design. (2 marks) (iv) Check the structural adequacy of the pavement. (6 marks) Modular ratio R m [Em C, has‘3/l53ubgrade]1"“ Subgrade strain criterion: N w {5351 tl‘microstra‘mll'm High water table Low water table Poor Average Good Poor Average Good Soil «-—-—--——— W W «---————~—- -—-——-—-—-—- —--————- !ype Pl A B A B A B A B A B A 8 Heavy clay 70 1.5 2 2 2 2 2 1.5 2 2 2 2 2.5 60 1.5 2 2 2 2 2.5 1.5 2 2 2 2 2.5 50 1.5 2 2 2 5 2 2.5 2 2 2 2.5 2 2.5 40 2 2.5 2.5 3 2.5 3 2.5 2.5 3 3 3 3.5 Silty clay 30 2.5 3.5 3 4 3.5 5 3 3.5 4 4 4 6 Sandy clay 20 2.5 4 4 5 4.5 7 3 4 5 6 6 8 10 1.5 3.5 3 6 3.5 7 2.5 4 4.5 7 6 >8 Silt 1 1 1 1 2 2 1 1 2 2 2 2 Sand poorly graded 20 well graded w»- 40 sandy gravel —-~ 60 Notes: Pl=plasticity index Poor. Average. Good refer to construction conditions A=thin pavement construction B=thick pavement construction Table 3 - Question 2 continued overleaf — CEB323T1.042 c0nt/. .. - Question 2 continued - QWWM‘ManM‘wwWw $3 _ 80m . mamm-a¢mw 32,33 “gamma momé my.» 3M... wmmwwmz km. 3.3 33.3% 3&3wa fimé “mafia magma a «an. 33 waimmwfififi athmfiwu. ii; 5;! «a mw boom, , .mmmgomw..- new $3 fix was 20 um Wm . EN _ 53 w . “mama .59 amwiamw gawk gamma 3:33...“ xficfiw Ema $93M” $3. mam Erwwmfi MEEEEQ mmm 3382 figfifl 33$ _ , mwwwxmmw uzmmwzm . $33» mm, mm; “mam gem @3mb um. . a 3:?» .5 2963.“? .3 355a mamxwéemiég gnaw . .2 6%. s35 gamma E Wamgmafi Maximum.“ Rafi W a. “Mnfifiwmfizwfix 3019638 33...», . Wmmfiwwfinma a; m m max. k aw. ymaemfin ufimmwém €3ch WU macaw . - Question 2 continued overleaf — cont/... CE3323T1.042 — Question 2 continued — {Evefi‘yiflg Material . I ' Weightacf Mean Pavement 1 Temperature 2' 2W0. ' 259(3) 313% Less than 25mm steam?!“ 53031356 58517353 500‘1350 semm asphai‘t saw/25:2 swam flaw/350 300mm asghafi 2%0‘1‘250 gamma 506331350 350mm aeghaiz v ' 210W’5fi r ' 21353156 ' 350%50 £52m 9.. 9m mamL.@.mW3mafiaWimwfilfisiiégwM” 2109156 . ‘ where materiaf is compacted using mofifiiad campacziye effort Table 5 «’E I: mmm :' > , 7 w; nag/$4 5% a; :Miamréai V V _. x : ,- ’ ' a2? 26.3 4w «3 845$ 15436.} ‘ ‘i 2 3 f «F 2 2 3. 24 ’ :3 3 I 33* 4 5 4’ '4; i 3 .423; ' 4 ‘ 5 55 '5 . V5 . 5 *6 g? a 5. 6, 3":3553 '2' ' ‘2" i?" j? 3 Table6 — Question 2 continued overleaf — CEB323T1.042 cont/. .. — Question 2 continued - w¢.mm av.mh mm.me mm.¢mH mm.%mfi mm.vmfi wfiwo Hm.mqm m mm.mvw . mm.wmw wa.wmm: mm.¢mw mm.wam: mm.wmm mm.mm¢2 Mm.vmw mmrmey dz MfiHhZMEZdF AQUmem> mZMfiawmcaUHfiw . szQmHm mfixv mmmxqumk EE mm.maw fl mxHa<m 0404 mm H 1.; ma.mNm a ma.mmm a Om‘mmm a mm.mmm a mm.mmm a on. mm.mkm a so. AqUHkmmb a xdmxm mmzcmuwfiw an. . .J WXMEMU<ALmMG {ax $.3mm 1 J sz mmq¢GM$m . t. X: a: fig 3. 91m JQHQdm .s a e: mm.© mo. wm.w Ha. mw.m Mr“. m44Um<L04wa m m m P m .. ....4...... m w W ..~ . ... . ... . OHkfia mZOmMHOL mmmm WUfiszU wu>k .AdHawhdfi m<4324mw fificmm 2x 0.3w . Mfithmwkfik ma m¥ ww.ma ww.MH w¢.ma mm.mH wfiUH z mfimzv mmnzaag I Ofiflw Table 7 Q.me 0.amm 0.3wm; 3.0mm ; 0.6mm Q.mmH i $.3wm; m.mmH ; o.mwm a. f 0.0wmg a. Fzm> mfifiw MEEV mwmwfl mDHQ<m OHhfihszQU as mkqnmmm 1 Nd m “:2? m w KNW<4 4<FOM u mmmkmwamdm .afium wwfluxzm “haugmbdm Jflsz €w4m Mnazw m6 }x<EEDm conUn. CEB323T1D42 QUESTION 3 (20 marks) (a) You have been asked to prepare a survey plan for a 16 hour (06:00 to 22:00) weekday busway station passenger usage survey. To determine station use, information is required on all passenger boardings and alightings, and a 20% sample of passenger wait times for their buses, on both the inbound and outbound platforms by hour across the survey period. You may assume that: I 80 peak direction buses/h and 50 contra-peak direction buses/h serve the station during each of the two (AM and PM) two-hour peak survey periods, I 40 peak direction buses/h and 25 contra—peak direction buses/h serve the station during the non-peak survey periods, I each boardings/alightings surveyor is able to process 1.5 buses/min during peak survey periods and 2 buses/min during non—peak survey periods, I each passenger wait time surveyor is able to process waiting passengers equivalent to 1 bus/min during peak survey periods and 1.5 buses/min during non-peak survey periods. (i) In your exam script construct a suitable survey form layout for each of the two surveyor types. (4 marks) (ii) Estimate the deployment needs (surveyor—hours) for the survey in eight successive two—hour shifts across the survey period. (4 marks) (b) A signalised intersection has the following movement data. Movements are numbered around the compass in the conventional manner. Movement Starting Phase Terminating Arrival Flow Saturation Phase (veh/h) Flow (veh/h) C B 135 1,400 3 C A 370 1,600 5 B C 1,000 3,500 11 A C 935 3,700 12 A B 145 1,600 Lost time for all movements is 65 and intergreen time 5s. Practical degree of saturation for all movements is 0.90. Minimum displayed green time for all movements is 8s. Note u =y/@, t =g+l, g = uc, y = q/s Respond to the following: (i) Draw the phase diagram for the phasing scheme set out in the table above. (2 marks) (ii) From the information above calculate trial movement times for each movement under an initial 70s cycle time. (2 marks) - Question 3 continued overleaf — CEB323T1.042 cont/... — Question 3 continued - (iii) (M (V) (vi) CEB323TLO42 Draw the critical movement search diagram and identify all possible critical paths. Identify the critical path. Identify whether the initial cycle time is sufficient. (2 marks) If the initial cycle time is sufficient, reapportion the critical movement times to suit the cycle time stating your policy. Otherwise, identify a revised cycle time that is sufficient and recalculate critical movement times accordingly. (2 marks) For your cycle time result from (iv), assign the non-critical movement times. (2 marks) Calculate the degrees of saturation for all movements and discuss how the intersection would perform under these conditions. (2 marks) conU”. 10 QUESTION 4 (20 marks! The South East Queensland region is experiencing rapid population growth. You are asked to conduct a transportation study for this region to propose solutions to transport problems up to the year 2021. (a) Outline the main stages of the planning process for that study. (6 marks) (b) That process will involve the use of transport demand models. Explain what models might be used. How can these models be used to estimate future travel patterns? (6 marks) (0) What is meant by the model calibration process? (2 marks) ((1) Describe the following two types of trip generation models: (i) Household linear regression. (ii) Household category analysis. (6 marks) CEB323T1.042 cont/. .. 11 QUESTION 5 {20 marks) (a) What is the main type of trip distribution model used in practice? (2 marks) (b) One such model has the following form. Explain what each term of this equation means: T_e4n ii ' 2 A1 fij I (4 marks) (c) How can this model be calibrated using data from surveys undertaken in 2004? Show the calibration process with the aid of the following example. Calculate the first estimate of the trip matrix by assuming that fij is equal to l. TRIP MATRIX (Number of trips) Destination zone 1 2 3 Origin Zone 1 3 00 100 1 50 2 100 225 420 3 200 320 175 COST MATRIX Destination zone 1 2 3 Origin Zone 1 7 17 12 2 17 2 7 3 14 8 3 (8 marks) (d) Explain how the calibrated model could be used to forecast a trip matrix for the year 2021. (6 marks) CEB323T1.042 cont]... 12 QUESTION 6 (20 marks) (a) Define the meaning of the proportion of free vehicles on a roundabout. How would you expect the proportion of free vehicles to change with increasing circulating stream flow? Give reasons. How would you measure the proportion of free vehicles? (6 marks) (b) Using the origin destination data at a roundabout: To Leg / South East North West From leg South 5 10 210 15 East 1 l - 23 3 70 North 350 9 — 21 West 21 190 27 - Calculate the entry capacity for a single lane roundabout entry at North leg, assuming that the headways have a Cowan relationship. Also assume that: A=25, T=4.3s, Wom=2.2s, a=0.75(1—qc), ,1: (9 marks) (0) List four different types of Road Safety Audits used in the different stages of the design, development and use of a road. (2 marks) (d) List three Issues you are likely to raise as a Road Safety Auditor. (3 marks) CEB323T1.042 cont]. .. 13 QUESTION 7 (20 marks) (a) Briefly explain the role of the traffic engineer in providing for safe operation of the road system. (2 marks) (b) The following chart is provided in the Highway Capacity Manual (TRB 2000) for analysis of motorway (freeway) mainline segments. Wm new: 3-4. LEVEL OF SERVICE CRITERIA. ILLUSTRATED 1300 120 Speed (km/h) Average Passengeeror 800 l000 1800 _ 1400 1600 ‘1800 2000 2200_ 8400 Flow Rate (pc/h/ln) With respect to this chart respond to the following: (i) Identify the three fundamental traffic flow variables depicted in the chart and explain the theoretical relationship between them. (ii) Explain why a family of curves is provided for analysis of mainline segments. (iii) Explain the meaning of the alphabetic measures (A. . .E) incorporated in the chart and how they relate to the family of curves. (iv) Explain the region of the chart denoted by the hand-drawn F in context of operation of mainline segments. (v) Explain the region of the chart denoted by the hand—drawn F in context of the analysis of mainline segments. (vi) Explain how you would use this chart to evaluate the performance of a particular mainline segment carrying a typical spectrum of vehicle classes. (6 marks) (c) How do you classify first, second and third priority streams at unsignalised intersections? Classify all movements at an unsignalised T-junction. (6 marks) - Question 7 continued overleaf — CEB323T1042 conUU. 14 - Question 7 continued — ((1) Explain the use and basis of the following equation in unsignalised intersection analysis, and define each of its terms: qa =zq+zq—Tizlna—X2> prl pr2 3 pr2 (6 marks) END OF PAPER CEB323T1.042 ...
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CEB323-T1-S2-2004 - GUT Student Number Surname Given Name/s...

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