Mats Öberg/Jim Hedfors GIS Development, SGI

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Presentation transcript:

GeoCost - assessment of groundworks and foundation reinforcement costs for buildings Mats Öberg/Jim Hedfors GIS Development, SGI ESRI User Conference, San Diego, July 12, 2017 (3:15 PM - 4:30 PM; Paper #: 86, Room 24 A)

Sweden, covered by ice ~20.000 years ago… https://commons.wikimedia.org/wiki/File:Weichsel-W%C3%BCrm-Glaciation.png#/media/File:Weichsel-W%C3%BCrm-Glaciation.png http://www.geus.dk/viden_om/voii/ilulissat-uk/voii03-uk.html This has shaped soil formation of Scandinavia, Canada etc - important for foundation reinforcement methods S W E D E N SGI is a government agency and research institute. Mission to reduce the risks of landslides and erosion

What is GeoCost? An ArcGIS-based tool (Models) for estimating foundation reinforce-ment costs in municipal develop-ment (and infrastructure*) GIS + Geotechnical engineer http://www.swedgeo.se/geokalkyl/ Large savings can be made by placing constructions in areas with the most favorable geotechnical conditions. Quickly calculates (alternative) costs for cut/fill, foundation reinforcement etc. Detailed elevation and soil data is used. Financed by the Swedish Government *) Also used by Swedish Transport Administration

Illustration of foundation reinforcement cost per m2 and suggested reinforcement method Also summaries of TOTAL cost and TOTAL cut/fill volumes

System workflow Geotechics Skills requirements: ArcGIS operator Geotechnical engineer Software requirements: ArcGIS Desktop 10.2+ 3D-analyst Microsoft Excel 2010+ Geoteknik GIS Geotechics

Prepare input data Calculate costs/ generate 3D scene Calculate foundation depth & cut/fill volumes Calculate costs/ generate 3D scene Calculate foundation reinforcement methods (piles etc) Based on ”Geotechnical Terrain Class” classification (soil profile down to bedrock) 1) Buildings (incl. height etc), 2) Hard surfaces (road etc), 3) Green space (vegetation) Terrain data (e.g. 2m raster); Soil geology Based on Excel ’conditional matrix’ created by geotechnical engineering practise (reinforcement metod etc, distance between piles etc), calculated using a series of ArcGIS Models Based on Excel ’condition matrix’, calculated using a series of ArcGIS Models Geoteknik GIS Geotechics

A development plan (’ready stage’) OR Type 1 Type 2 Type 3 50m Green space Hard surface Buildings A development plan (’ready stage’) OR modules of building blocks (’early stage’)

Example of placement of modules and making consistent GIS-surfaces *) consistent = adjacent, non-overlapping buildings; hard surfaces; green space

Suggested reinforcement method

Cost (for reinforcement) in Swedish Krona/m2 [2D display] E.g. 1000 SEK ~ 100 US$

Cost (for reinforcement) in Swedish Krona/m2 [3D display in ArcScene] Exaggerated height scale 1,5X Cost (for reinforcement) in Swedish Krona/m2 [3D display in ArcScene] ~ 2 million US$ xls summary of TOTAL costs (tSEK) Cut/fill Reinforcement Toxic cleanup TOTAL xls summary of cut/fill volumes (m3) Cut Fill Steel, concrete or lime cement piles

3D, top surfaces for various levels GeoCost allows for zoning of height areas Cut and fill [3D display]

TOTAL: 2 million US$ 4 million US$ Two alternative locations for the same set of buildings… Hemgården SV Höjdzon: +5,9 m.ö.h. Hemgården NO Höjdzon: +8,4 m.ö.h. Important calculation results: Reinforcement costs in the Northeast would be double compared to the reinforcement cost if construcion would occur in Southwest. TOTAL: 2 million US$ 4 million US$

3D web display (with surrounding terrain and existing buildings) – ArcGIS Online/City Engine https://gis.swedgeo.se/geokalkyl/3ws/ The tool (mxd, tbx, sxd, example data, Manual, instruction videos) is free to download at http://gis.swedgeo.se/geokalkyl/verktyget (in Swedish…)

Thank you! CONTACT Mats Öberg (GIS-architect, M.Sc. Civil Engineering) Swedish Geotechnical Institute Hugo Grauers gata 5 B 412 96 GOTEBORG Phone: +46 709 730 129 E-mail: mats.oberg@swedgeo.se

EXTRA

GTK Geotechnical Terrain Class must be evaluated by geotechnical engineer The soil profile to bedrock may vary considerably!

Soil layer 1 Soil layer 2 Soil layer 3

Item attributes may be shown

A small part of one of the Models A specific Geotechnical Terrain class Load in kPa of a building Reinforcement depth Various reinforcement metods applied Conditional matrix Developed by A small part of one of the Models