assignment details attached in files
Assignment 2 (GEOLOGY) Instructions and Rubric GEOM2131 Geology: Assignment 2 2019 LNG Site Assignment In this assignment you will assess the ground conditions of your cross-section based on three drill holes including: foundation and slope stability conditions, excavatability and potential for construction material. Background: The project data is typical of the site preparation of a major LNG facility. Part 1 – Interpretive Geological Cross-section Using the same methods as given in Assignment 1A (Melbourne Interpretive Geological Cross-section) complete a cross-section for the three drill holes allocated to you from the NWLNG database. The drill holes are 50 m apart and should be presented in order of lowest on the left side of the cross-section. Use a vertical exaggeration of 10. Only present your interpretation to a depth of -10 m relative to sea- level. Present the cross-section in the same format as required for Assignment 1A. Part 1 submission 1 page. Part 2 – Foundations and Stability You will make an assessment of the geological conditions that would be encountered in the base and cut slopes of a trench excavation. You will not actually design a foundation or undertake design calculations. Scenario: The site requires excavation to a depth of 7.5 m above sea level. The excavation is centred on your middle drill hole. The base of the trench excavation is 5 m wide. The cut slopes at each side of the trench can be 1:1 or 2:1 (H:V). The steeper slope would be recommended if the slope is mainly in sound rock and the shallower slope would be recommended if the slope is mainly in soil or unsound rock. The slopes can be stabilised temporarily against erosion by placing hard rock fragments against any soft rock or soil exposed on the slope. Mark the location of these stabilisation works on your cross-section graphic. Instructions: On a copy of your cross-section graphic from part 1, illustrate the trench excavation floor and show the recommended slopes for the sides of the trench. Prepare a table(s) that addresses the following questions: Are coarse soil (2biii), fine soil (2biv) or clay/silt (3aiii) which all contain high plasticity clays found in the faces and floor (base) of the trench excavation on your section? Are coarse soil (2biii), fine soil (2biv) or clay/silt (3aiii) which all contain high plasticity clays found in the 10 m below the floor (base) of the trench excavation on your section? Comment on the likelihood of occurrence of the flexure or punching bearing capacity failure modes (Kulhawy and Goodman, Fig. 55.6) occurring in the excavation floor at 7.5m asl (calculation is not required). Also comment on the likelihood of occurrence of the flexure or punching bearing capacity failure modes (Kulhawy and Goodman, Fig. 55.6) occurring if the excavation depth were extended deeper to 2.5 m asl (calculation is not required). Summarise the RQD and strength of material within 10 m of the floor (base) level of the excavation. Use Kulhawy and Goodman, Fig. 55.1 to comment on allowable contact pressure at the excavation floor at 7.5m asl (calculation is not required). Use Hencher’s summary of the British Standards (Table 6.1) to estimate bearing value of a strip footing taking into account material within 10 m of the floor (base) level of the trench (Rock types 1b and 2a have UCS between 12.5-50 MPa, all other materials are weaker). Use Look 2014 (Table 22.1) to estimate the allowable bearing pressure. Do not include the illustrations or tables in these sources in your report. Part 2 submission 2 pages. Page 1 graphic with excavations marked, page 2 table of answers to questions. GEOM2131 Geology: Assignment 2 2019 Part 3 - Excavatability Addition data: Pettifer and Fookes 1994 [extract] (pdf) Refer to AS1726 [for converting strength descriptions to PLI numbers] The data spreadsheet contains a record of the lithology (rock type), RQD and strength in each drill hole. The intervals (top and bottom) of these three parameters do not coincide. In order to assess the relationships of these three parameters you will undertake a ‘point-sampling’ of the data. At each metre mark (relative to sea-level) between the ground surface and -5m record each of the three parameters in a table. Pettifer and Fookes’ paper explains in a footnote to the chart how to convert RQD to their discontinuity spacing index and the lecture slides provide a modified (new) formula by Palmstrom (which you must use). Plot the spacing in the conventional RQD classes of excellent (>90), good (75-89), fair (50-74), poor (25-49), very poor (<25). plot your data for rock type 2a and 2bi on the pettifer and fookes chart. summarise the excavatability conditions for those rock types. also show excavatability conditions for 2a and 2bi on the interpretive cross-section from part 1. part 3 submission 3 pages. page 1 your point sampling data table. page 2 excavatability chart for rock type 2a (if present) and page 3 excavatability chart for rock type 2bi (if present). your brief summary statement of the excavatability conditions for 2a and 2bi will be shown on page 2 and 3. part 4 – construction materials your three drill hole interpreted geological cross section (and related data) will form the basis of this part of the assignment. you should check that your cross-section conforms to the vertical and horizontal scales in the original template as this will influence the calculation of areas from the cross section. you will make an assessment of selected construction materials available at your part of the site. scenario: two of the construction materials required for construction of part of the lng facility are armourstone for marine works protection and sand for pipeline bedding. you are required to assess your section as a source for these material. use the following assumptions in your work. the materials which have the potential to yield armourstone are calcrete [a type of limestone] (1b), crystalline limestone (2a) and limestone hard (2bi). calcrete is estimated to yield 20% armourstone regardless of the rqd value. crystalline limestone (2a) and limestone hard (2bi) are estimated to yield 20% armour if the rqd is 75% or above (otherwise no armourstone is expected). sand (with fines) (3ai) has been found to be a suitable pipeline bedding material. for practical extraction reasons, areas of potential construction materials must be defined as rectangles with horizontal and vertical sides with a minimum dimension of 1m. areas must not include other materials. areas must include at least one drill hole section. coarse soil (2biii), fine soil (2biv) and clay/silt (3aiii) are found to contain high plasticity clays deleterious to use as site fill. if these materials occur on your section outline the materials with rectangles so that material outside these rectangles (with horizontal and vertical sides with a minimum dimension of 1m) would not be contaminated during excavation. instructions: on your cross-section graphic, illustrate rectangular areas of potential armourstone and bedding sand. also show outlines of rectangular areas to be excluded during excavation to avoid contamination with highly plastic clay. only material above the -5m (5m below sea level) datum is to be considered. include a table which summarises your defined areas including the width of each area, the elevation of the top and bottom of each area, total area and material type. also report the data in tonnes/m for the plane of the cross section. the main constituent of limestone (calcium carbonate) has a specific gravity of 2.7 times water but with an average 7% porosity of the rock. the sand comprises quartz (specific gravity 2.65 times water) but with an average 25% porosity. tonnage is not required for the clay-bearing deleterious materials. part 4 submission 2 pages. page 1 cross-section graphic, page 2 table of construction materials type and quantities. geom2131 geology: assignment 2 2019 combined parts 1-4. your 8 page report (in a single pdf file in landscape layout) must be submitted to the canvas by the due date. do not include cover sheets. your file name should include your student number or name. marking rubric criteria mark allocation (partial marks can be awarded) level 0 level 1 level 2 level 3 level 4 level 5 marks 3 /30 0 1 2 2.5 3 1. geological interpretation shows a clear, accurate realistic, evidence-based distribution of lithology between and beyond drill holes interpretation not realistic or evidence-based few aspects of interpretation realistic and evidence-based. almost all aspects of interpretation realistic and evidence-based. interpretation realistic and evidence-based. but does not show good awareness of geological features interpretation realistic and evidence-based. shows good awareness of geological features marks 9 /30 0 1-2 5 7 9 2. excavatability assessed according to instructions. assessment not conducted according to instructions few aspects of assessment conducted according to instructions. some important aspects of assessment not conducted according to instructions. some minor aspects of assessment not conducted according to instructions. all aspects of assessment conducted according to instructions with excellent clarity. marks 9 /30 0 1-2 5 7 9 3. stability assessed according to instructions. assessment not conducted according to instructions few aspects of assessment conducted according to instructions. some important aspects of assessment not conducted according to instructions. some minor aspects of assessment not conducted according to instructions. all aspects of assessment conducted according to instructions with excellent clarity. marks 9 /30 0 1-2 5 7 9 4. construction materials assessed according to instructions. assessment not conducted according to instructions few aspects of assessment conducted according to instructions. some important aspects of assessment not conducted according to instructions. some minor aspects of assessment not conducted according to instructions. all aspects of assessment conducted according to instructions with excellent clarity. plot="" your="" data="" for="" rock="" type="" 2a="" and="" 2bi="" on="" the="" pettifer="" and="" fookes="" chart.="" summarise="" the="" excavatability="" conditions="" for="" those="" rock="" types.="" also="" show="" excavatability="" conditions="" for="" 2a="" and="" 2bi="" on="" the="" interpretive="" cross-section="" from="" part="" 1.="" part="" 3="" submission="" 3="" pages.="" page="" 1="" your="" point="" sampling="" data="" table.="" page="" 2="" excavatability="" chart="" for="" rock="" type="" 2a="" (if="" present)="" and="" page="" 3="" excavatability="" chart="" for="" rock="" type="" 2bi="" (if="" present).="" your="" brief="" summary="" statement="" of="" the="" excavatability="" conditions="" for="" 2a="" and="" 2bi="" will="" be="" shown="" on="" page="" 2="" and="" 3.="" part="" 4="" –="" construction="" materials="" your="" three="" drill="" hole="" interpreted="" geological="" cross="" section="" (and="" related="" data)="" will="" form="" the="" basis="" of="" this="" part="" of="" the="" assignment.="" you="" should="" check="" that="" your="" cross-section="" conforms="" to="" the="" vertical="" and="" horizontal="" scales="" in="" the="" original="" template="" as="" this="" will="" influence="" the="" calculation="" of="" areas="" from="" the="" cross="" section.="" you="" will="" make="" an="" assessment="" of="" selected="" construction="" materials="" available="" at="" your="" part="" of="" the="" site.="" scenario:="" two="" of="" the="" construction="" materials="" required="" for="" construction="" of="" part="" of="" the="" lng="" facility="" are="" armourstone="" for="" marine="" works="" protection="" and="" sand="" for="" pipeline="" bedding.="" you="" are="" required="" to="" assess="" your="" section="" as="" a="" source="" for="" these="" material.="" use="" the="" following="" assumptions="" in="" your="" work.="" the="" materials="" which="" have="" the="" potential="" to="" yield="" armourstone="" are="" calcrete="" [a="" type="" of="" limestone]="" (1b),="" crystalline="" limestone="" (2a)="" and="" limestone="" hard="" (2bi).="" calcrete="" is="" estimated="" to="" yield="" 20%="" armourstone="" regardless="" of="" the="" rqd="" value.="" crystalline="" limestone="" (2a)="" and="" limestone="" hard="" (2bi)="" are="" estimated="" to="" yield="" 20%="" armour="" if="" the="" rqd="" is="" 75%="" or="" above="" (otherwise="" no="" armourstone="" is="" expected).="" sand="" (with="" fines)="" (3ai)="" has="" been="" found="" to="" be="" a="" suitable="" pipeline="" bedding="" material.="" for="" practical="" extraction="" reasons,="" areas="" of="" potential="" construction="" materials="" must="" be="" defined="" as="" rectangles="" with="" horizontal="" and="" vertical="" sides="" with="" a="" minimum="" dimension="" of="" 1m.="" areas="" must="" not="" include="" other="" materials.="" areas="" must="" include="" at="" least="" one="" drill="" hole="" section.="" coarse="" soil="" (2biii),="" fine="" soil="" (2biv)="" and="" clay/silt="" (3aiii)="" are="" found="" to="" contain="" high="" plasticity="" clays="" deleterious="" to="" use="" as="" site="" fill.="" if="" these="" materials="" occur="" on="" your="" section="" outline="" the="" materials="" with="" rectangles="" so="" that="" material="" outside="" these="" rectangles="" (with="" horizontal="" and="" vertical="" sides="" with="" a="" minimum="" dimension="" of="" 1m)="" would="" not="" be="" contaminated="" during="" excavation.="" instructions:="" on="" your="" cross-section="" graphic,="" illustrate="" rectangular="" areas="" of="" potential="" armourstone="" and="" bedding="" sand.="" also="" show="" outlines="" of="" rectangular="" areas="" to="" be="" excluded="" during="" excavation="" to="" avoid="" contamination="" with="" highly="" plastic="" clay.="" only="" material="" above="" the="" -5m="" (5m="" below="" sea="" level)="" datum="" is="" to="" be="" considered.="" include="" a="" table="" which="" summarises="" your="" defined="" areas="" including="" the="" width="" of="" each="" area,="" the="" elevation="" of="" the="" top="" and="" bottom="" of="" each="" area,="" total="" area="" and="" material="" type.="" also="" report="" the="" data="" in="" tonnes/m="" for="" the="" plane="" of="" the="" cross="" section.="" the="" main="" constituent="" of="" limestone="" (calcium="" carbonate)="" has="" a="" specific="" gravity="" of="" 2.7="" times="" water="" but="" with="" an="" average="" 7%="" porosity="" of="" the="" rock.="" the="" sand="" comprises="" quartz="" (specific="" gravity="" 2.65="" times="" water)="" but="" with="" an="" average="" 25%="" porosity.="" tonnage="" is="" not="" required="" for="" the="" clay-bearing="" deleterious="" materials.="" part="" 4="" submission="" 2="" pages.="" page="" 1="" cross-section="" graphic,="" page="" 2="" table="" of="" construction="" materials="" type="" and="" quantities.="" geom2131="" geology:="" assignment="" 2="" 2019="" combined="" parts="" 1-4.="" your="" 8="" page="" report="" (in="" a="" single="" pdf="" file="" in="" landscape="" layout)="" must="" be="" submitted="" to="" the="" canvas="" by="" the="" due="" date.="" do="" not="" include="" cover="" sheets.="" your="" file="" name="" should="" include="" your="" student="" number="" or="" name.="" marking="" rubric="" criteria="" mark="" allocation="" (partial="" marks="" can="" be="" awarded)="" level="" 0="" level="" 1="" level="" 2="" level="" 3="" level="" 4="" level="" 5="" marks="" 3="" 30="" 0="" 1="" 2="" 2.5="" 3="" 1.="" geological="" interpretation="" shows="" a="" clear,="" accurate="" realistic,="" evidence-based="" distribution="" of="" lithology="" between="" and="" beyond="" drill="" holes="" interpretation="" not="" realistic="" or="" evidence-based="" few="" aspects="" of="" interpretation="" realistic="" and="" evidence-based.="" almost="" all="" aspects="" of="" interpretation="" realistic="" and="" evidence-based.="" interpretation="" realistic="" and="" evidence-based.="" but="" does="" not="" show="" good="" awareness="" of="" geological="" features="" interpretation="" realistic="" and="" evidence-based.="" shows="" good="" awareness="" of="" geological="" features="" marks="" 9="" 30="" 0="" 1-2="" 5="" 7="" 9="" 2.="" excavatability="" assessed="" according="" to="" instructions.="" assessment="" not="" conducted="" according="" to="" instructions="" few="" aspects="" of="" assessment="" conducted="" according="" to="" instructions.="" some="" important="" aspects="" of="" assessment="" not="" conducted="" according="" to="" instructions.="" some="" minor="" aspects="" of="" assessment="" not="" conducted="" according="" to="" instructions.="" all="" aspects="" of="" assessment="" conducted="" according="" to="" instructions="" with="" excellent="" clarity.="" marks="" 9="" 30="" 0="" 1-2="" 5="" 7="" 9="" 3.="" stability="" assessed="" according="" to="" instructions.="" assessment="" not="" conducted="" according="" to="" instructions="" few="" aspects="" of="" assessment="" conducted="" according="" to="" instructions.="" some="" important="" aspects="" of="" assessment="" not="" conducted="" according="" to="" instructions.="" some="" minor="" aspects="" of="" assessment="" not="" conducted="" according="" to="" instructions.="" all="" aspects="" of="" assessment="" conducted="" according="" to="" instructions="" with="" excellent="" clarity.="" marks="" 9="" 30="" 0="" 1-2="" 5="" 7="" 9="" 4.="" construction="" materials="" assessed="" according="" to="" instructions.="" assessment="" not="" conducted="" according="" to="" instructions="" few="" aspects="" of="" assessment="" conducted="" according="" to="" instructions.="" some="" important="" aspects="" of="" assessment="" not="" conducted="" according="" to="" instructions.="" some="" minor="" aspects="" of="" assessment="" not="" conducted="" according="" to="" instructions.="" all="" aspects="" of="" assessment="" conducted="" according="" to="" instructions="" with="" excellent="">