{"id":10449,"date":"2022-03-30T16:42:02","date_gmt":"2022-03-30T08:42:02","guid":{"rendered":"https:\/\/cde.nus.edu.sg\/cee\/?page_id=10449"},"modified":"2022-10-03T16:01:00","modified_gmt":"2022-10-03T08:01:00","slug":"look-ahead-integrated-geophysical-investigation-system-igis-for-singapore-tunnels","status":"publish","type":"page","link":"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/slc\/look-ahead-integrated-geophysical-investigation-system-igis-for-singapore-tunnels\/","title":{"rendered":"Look-Ahead Integrated Geophysical Investigation System (IGIS) for Singapore Tunnels"},"content":{"rendered":"\n\n\t\t\t\t\t<ul id=\"menu-research\"><li id=\"menu-item-13844\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/\">Research Clusters<\/a>\n<ul>\n\t<li id=\"menu-item-13848\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/built-environment\/\">Built Environment 4.0<\/a>\n\t<ul>\n\t\t<li id=\"menu-item-14104\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/built-environment\/autonomous-bim-ready-drone-system-for-building-facades-inspection\/\">Autonomous BIM-ready Drone System for Building Facades Inspection<\/a><\/li>\n\t\t<li id=\"menu-item-14105\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/built-environment\/intelligent-lifting-frame-for-ppvc-and-precast-construction\/\">Intelligent Lifting Frame for PPVC and Precast Construction<\/a><\/li>\n\t\t<li id=\"menu-item-14106\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/built-environment\/lightweight-high-strength-steel-concrete-composite-modular-buildings-with-fast-track-connections\/\">Lightweight High-Strength Steel-Concrete Composite Modular Buildings with Fast Track Connections<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-13847\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ccm\/\">Climate Change Mitigation<\/a>\n\t<ul>\n\t\t<li id=\"menu-item-14111\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ccm\/bridging-scales-from-below\/\">Bridging Scales from Below: The Role of Heterogeneities in the Global Water and Carbon Budgets<\/a><\/li>\n\t\t<li id=\"menu-item-14108\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ccm\/increasing-occurrences-of-cyanobacterial-blooms-driven-by-climate-change-factors\/\">Increasing Occurrences of Cyanobacterial Blooms Driven by Climate Change Factors<\/a><\/li>\n\t\t<li id=\"menu-item-14107\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ccm\/carbon-capture-and-utilization\/\">Carbon Capture and Utilization<\/a><\/li>\n\t\t<li id=\"menu-item-14109\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ccm\/integrated-coastal-inland-flood-model-for-climate-change\/\">Integrated Coastal-Inland Flood Model for Climate Change<\/a><\/li>\n\t\t<li id=\"menu-item-14110\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ccm\/pathways-for-sustainable-and-climate-resilient-planning-of-water-energy-food-security-nexus\/\">Pathways for Sustainable and Climate-Resilient Planning of Water-Energy-Food Security Nexus<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-13846\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/environmental-sustainability\/\">Environmental Sustainability<\/a>\n\t<ul>\n\t\t<li id=\"menu-item-14113\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/environmental-sustainability\/air-quality-and-health-a-paradigm-shift\/\">Air Quality and Health: A Paradigm Shift<\/a><\/li>\n\t\t<li id=\"menu-item-14114\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/environmental-sustainability\/surface-water-quality-and-emerging-contaminants\/\">Surface Water Quality and Emerging Contaminants<\/a><\/li>\n\t\t<li id=\"menu-item-14115\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/environmental-sustainability\/microbial-detoxification-of-persistent-organohalide-pollutants-pops\/\">Microbial detoxification of persistent organohalide pollutants (POPs)<\/a><\/li>\n\t\t<li id=\"menu-item-14116\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/environmental-sustainability\/nutrients-removal-in-waterbodies-via-sustainable-pathways\/\">Nutrients Removal in Waterbodies via Sustainable Pathways<\/a><\/li>\n\t\t<li id=\"menu-item-14117\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/environmental-sustainability\/centre-for-water-research-cwr-researchers-join-their-forces-with-u-of-t-researchers-for-microplastics-pollution-detection-and-control-in-water-and-wastewater\/\">Centre for Water Research (CWR) researchers join their forces with U of T researchers for microplastics pollution detection and control in water and wastewater<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-13845\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ocean-infrastructure-and-renewables\/\">Ocean Infrastructure and Renewables<\/a>\n\t<ul>\n\t\t<li id=\"menu-item-14118\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ocean-infrastructure-and-renewables\/\">Ocean Infrastructure and Renewables<\/a><\/li>\n\t\t<li id=\"menu-item-14119\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ocean-infrastructure-and-renewables\/evaluation-of-in-situ-consolidation-of-dredged-and-excavated-materials-at-the-reclaimed-next-generation-tuas-port\/\">Evaluation of In-Situ Consolidation of Dredged and Excavated Materials at the Reclaimed Next Generation Tuas Port<\/a><\/li>\n\t\t<li id=\"menu-item-14120\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/ocean-infrastructure-and-renewables\/enhancing-offshore-system-productivity-integrity-and-survivability-in-extreme-environments-wp2-local-digital-twin\/\">Enhancing Offshore System Productivity, Integrity and Survivability in Extreme Environments &#8211; WP2: Local Digital Twin<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-13843\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/resilient-infrastructures\/\">Resilient Infrastructures<\/a>\n\t<ul>\n\t\t<li id=\"menu-item-14121\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/resilient-infrastructures\/digital-fabrication-of-concrete-for-sustainable-and-resilient-built-environment\/\">Digital Fabrication of Concrete for Sustainable and Resilient Built Environment<\/a><\/li>\n\t\t<li id=\"menu-item-14122\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/resilient-infrastructures\/upcycling-local-waste-for-sustainable-concreting-in-marine-conditions\/\">Upcycling Local Waste for Sustainable Concreting in Marine Conditions<\/a><\/li>\n\t\t<li id=\"menu-item-14123\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/resilient-infrastructures\/development-of-sustainable-self-healing-concrete-by-use-of-recycled-materials\/\">Development of Sustainable Self-Healing Concrete by Use of Recycled Materials<\/a><\/li>\n\t\t<li id=\"menu-item-14124\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/resilient-infrastructures\/low-carbon-construction-materials-incorporating-solid-waste\/\">Low-carbon Construction Materials Incorporating Solid Waste<\/a><\/li>\n\t<\/ul>\n<\/li>\n\t<li id=\"menu-item-13842\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/slc\/\">Smart and Liveable Cities<\/a>\n\t<ul>\n\t\t<li id=\"menu-item-14125\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/slc\/intelligent-traffic-diffusion-plan-generation-effective-assessment-and-dissemination-strategies\/\">Intelligent Traffic Diffusion Plan Generation, Effective Assessment and Dissemination Strategies<\/a><\/li>\n\t\t<li id=\"menu-item-14126\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/slc\/transforming-waste-into-resources-for-infrastructural-development\/\">Transforming Waste into Resources for Infrastructural Development<\/a><\/li>\n\t\t<li id=\"menu-item-14127\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/slc\/look-ahead-integrated-geophysical-investigation-system-igis-for-singapore-tunnels\/\">Look-Ahead Integrated Geophysical Investigation System (IGIS) for Singapore Tunnels<\/a><\/li>\n\t\t<li id=\"menu-item-14128\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-clusters\/slc\/next-generation-airport-pavements-with-full-scale-instrumented-testing\/\">Next-Generation Airport Pavements with Full-Scale Instrumented Testing<\/a><\/li>\n\t<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li id=\"menu-item-13849\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-centres\/\">Research Centres<\/a>\n<ul>\n\t<li id=\"menu-item-14131\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-centres\/centre-for-advanced-materials-and-structures\/\">Centre for Advanced Materials and Structures<\/a><\/li>\n\t<li id=\"menu-item-14132\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-centres\/centre-for-hazard-research\/\">Centre for Hazard Research<\/a><\/li>\n\t<li id=\"menu-item-14130\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-centres\/centre-for-soft-ground-engineering\/\">Centre for Soft Ground Engineering<\/a><\/li>\n\t<li id=\"menu-item-14129\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-centres\/centre-for-transportation-research\/\">Centre for Transportation Research<\/a><\/li>\n\t<li id=\"menu-item-13850\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-centres\/centre-for-water-research\/\">Centre for Water Research<\/a><\/li>\n<\/ul>\n<\/li>\n<li id=\"menu-item-13852\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/laboratories\/\">Laboratories<\/a>\n<ul>\n\t<li id=\"menu-item-13851\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/laboratories\/structural-engineering-laboratory\/\">Structural Engineering Laboratory<\/a><\/li>\n\t<li id=\"menu-item-14137\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/laboratories\/itvs-laboratory\/\">ITVS Laboratory<\/a><\/li>\n\t<li id=\"menu-item-14136\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/laboratories\/hydraulic-engineering-laboratory\/\">Hydraulic Engineering Laboratory<\/a><\/li>\n\t<li id=\"menu-item-14135\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/laboratories\/highway-engineering-laboratory\/\">Highway Engineering Laboratory<\/a><\/li>\n\t<li id=\"menu-item-14134\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/laboratories\/geotechnical-engineering-laboratory\/\">Geotechnical Engineering Laboratory<\/a><\/li>\n\t<li id=\"menu-item-14133\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/laboratories\/environmental-engineering-laboratory\/\">Environmental Engineering Laboratory<\/a><\/li>\n<\/ul>\n<\/li>\n<li id=\"menu-item-13854\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/graduate\/graduate-research\/safety-health-committee\/\">Safety &amp; Health Committee<\/a><\/li>\n<li id=\"menu-item-13855\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/graduate\/graduate-research\/completed-research-projects\/\">Completed Research Projects<\/a><\/li>\n<li id=\"menu-item-13856\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/research-brief\/\">Research Brief<\/a><\/li>\n<li id=\"menu-item-13857\"><a href=\"https:\/\/cde.nus.edu.sg\/cee\/research\/achievements-in-the-media\/\">Achievements (in the media)<\/a><\/li>\n<\/ul>\t\n\t<h2>\n\t\tLook-Ahead Integrated Geophysical Investigation System (IGIS) for Singapore Tunnels\n\t<\/h2>\n\t<p>This project aims to provide a real-time, non-destructive, and non-disruptive warning system equipped with cutting edge geophysical sensors and techniques in tunnel to detect potential risks ahead of the TBM cutter head. This is the first fully non-intrusive, non-disruptive, and universally compatible tunnel look-ahead system that has been proposed and tested in the tunnelling industry.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/cde.nus.edu.sg\/wp-content\/uploads\/sites\/7\/2022\/03\/IGIS-Fig-1.png\" alt=\"Igis Fig 1\" width=\"578\" height=\"282\" \/><\/p>\n<p>The underground space in Singapore is unique with complex geology and many previous developments. The confined environment caused by a tunnel boring machine (TBM) and the geometry of the tunnel severely limit the possible design for conventional data acquisition methods. In addition, the high accuracy, high resolution, and near real-time requirements during a tunnel project have also significantly challenged the conventional geophysical survey. In the project, the above technical challenges are overcome based on an integrated geophysical investigation system (IGIS) where seismic, GPR, and ER methods complement each other for a reliable and fast solution to guide the tunnel projects. Innovations in data acquisition, signal processing, and engineering are studied for each geophysical method. In particular, fibre optical cables are utilized in addition to conventional geophones for better, longer, and real-time recordings of the active and passive seismic signal. Specific processing algorithms will be developed for these seismic signals according to its specific geometry and noise signature. In this study, the feasibility of acquiring its data on the side wall inside the tunnel lining is explored. This is to alleviate the requirements of existing systems to have direct access to the tunnel face or to drill through the tunnel lining for direct contact to the geological formation. The rich data gathered from these geophysical methods are analysed simultaneously, in order to enhance the resolution and to provide more information on the physical properties of the detect obstruction. Finally, a data-based machine-learning approach is proposed to connect all geophysical data with the soil model.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/cde.nus.edu.sg\/wp-content\/uploads\/sites\/7\/2022\/03\/IGIS-Fig-2-225x300.jpeg\" alt=\"Igis Fig 2\" width=\"225\" height=\"300\" \/><\/p>\n<p>The success of this project generates essential knowledge about the feasibility of geophysical methods in a tunnel environment and provides specific guidance and recommendations on how to implement these methods inside each TBM for different geological conditions. The impact of its success is not limited to Singapore, but also to any constantly developing urban city globally.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/cde.nus.edu.sg\/wp-content\/uploads\/sites\/7\/2022\/03\/IGIS-Fig-3-1024x461.jpeg\" alt=\"Igis Fig 3\" width=\"520\" height=\"234\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>For more details, please contact:<br \/><a href=\"https:\/\/cde.nus.edu.sg\/cee\/staff\/chian-siau-chen-darren\/\" target=\"_blank\" rel=\"noopener\"><strong>Assoc Prof Chian Siau Chen, Darren<\/strong><\/a><br \/>Email: <a href=\"mailto:sc.chian@nus.edu.sg\">sc.chian@nus.edu.sg<\/a><\/p>\n<p>&nbsp;<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Research Clusters Built Environment 4.0 Autonomous BIM-ready Drone System for Building Facades Inspection Intelligent Lifting Frame for PPVC and Precast Construction Lightweight High-Strength Steel-Concrete Composite Modular Buildings with Fast Track Connections Climate Change Mitigation Bridging Scales from Below: The Role of Heterogeneities in the Global Water and Carbon Budgets Increasing Occurrences of Cyanobacterial Blooms Driven [&hellip;]<\/p>\n","protected":false},"author":54,"featured_media":9438,"parent":10426,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-10449","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.7 - 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