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X-WR-CALNAME:Australian Tunnelling Society
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X-WR-CALDESC:Events for Australian Tunnelling Society
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DTSTART;TZID=Australia/Brisbane:20260604T180000
DTEND;TZID=Australia/Brisbane:20260604T190000
DTSTAMP:20260513T225324
CREATED:20260505T005210Z
LAST-MODIFIED:20260505T005210Z
UID:291886-1780596000-1780599600@australiantunnellingsociety.com.au
SUMMARY:The ground investigation for a storage cavern in metamorphic rock at 600 m depth
DESCRIPTION:Overview\nThis presentation describes the processes used in the investigations for a deep compressed air storage cavern in a complex metamorphic environment. The exploration process involved drilling using HQ-3 coring techniques from surface and also from an adjacent underground mine. The latter were two 460 m boreholes drilled just sub horizontally across the planned cavern location. \nThe core from these holes was logged for structure and sampled for rock property testing. Because a significant portion of the rock was highly anisotropic the test methods used had to be adapted. This included alternative ways of working with point load testing\, triaxial testing for anisotropy of moduli and some special shear tests.  Because of the importance of determining potential leakage of groundwater into the cavern\, or of air out of the cavern\, the correct measurement of the ground fluid pressure and the permeability of the rock mass were extremely important. \nTesting had to be conducted in stages to cover the entire length of the holes. The method used was to fit the drill rods with a straddle packer assembly\, downhole valve system and suitable precision pressure monitoring with operator read out. First the test zone was shut in to recover pressure. This was followed by a period of injection or production which was followed by another shut in period. These tests followed oilfield practice but with tools designed to work with HRQ drill rod and used horizontally. \nThe rock stress was determined by the use of three dimensional overcore tools used up to 441 m laterally. Other techniques could have also been advantageously used to fill in the sparse overcore data in the extremely complex geological environment. The vertical and the horizontal holes were logged using both acoustic televiewer and full wave sonic sondes. \nThe conclusions of the study were that the rock mass was heterogeneous but fit for purpose provided that the correct design decisions were made. The presentation also looks at what can be achieved from open hole drilling test techniques compared to coring and the comparative costs of these. This has particular relevance to tunnel investigations. \nProgram timeline\nOnline \n6.00pm – Presentation commences \n7.00pm – Presentation concludes \nIn-Person \n5.30pm – Registration\, networking & catering \n6.00pm – Presentation commences\, networking \n7.00pm – Event concludes \nLearning outcomes\n\nYou should gain an appreciation of the importance of geology.\nYou will gain an understanding of the methods used to determine the states of stress in rock and the measurement of anisotropic rock properties.\nThe methods used and the importance of determining fluid pressures and permeability properly are extremely important and should totally replace conventional packer testing.\n\nAbout the speaker\n\n\n\nIan Gray\nManaging Director\, Sigra Pty Ltd\n\nDr Ian Gray is the managing director of Sigra Pty Ltd\, a role he has held for 32 years. In his career he has had the roles of mining\, civil\, geotechnical and reservoir engineers\, engineering geologist and hydrogeologist. He has worked in 20 countries dealing with mines\, tunnels\, slopes\, petroleum reservoirs and anything else in the ground. One of his passions is actually measuring things in the ground properly. To do this he has developed a suite of equipment and techniques. He also works with a variety of drilling systems.
URL:https://australiantunnellingsociety.com.au/ats-event/the-ground-investigation-for-a-storage-cavern-in-metamorphic-rock-at-600-m-depth/
LOCATION:Online and in person at: Level 9\, 340 Adelaide Street\, Brisbane
CATEGORIES:Online,Queensland,Webinar
ATTACH;FMTTYPE=image/png:https://australiantunnellingsociety.com.au/wp-content/uploads/2026/05/Screenshot-2026-05-05-105122.png
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DTSTART;TZID=Australia/Brisbane:20260714T173000
DTEND;TZID=Australia/Brisbane:20260714T183000
DTSTAMP:20260513T225324
CREATED:20260504T023108Z
LAST-MODIFIED:20260504T023856Z
UID:291380-1784050200-1784053800@australiantunnellingsociety.com.au
SUMMARY:SLAM LiDAR for transport tunnel surveying
DESCRIPTION:Overview\nThe term “mobile mapping” is well established in the survey industry — typically referring to large vehicle-mounted systems that combine high-end LiDAR with precision GNSS and IMU hardware. These systems are powerful\, but they are expensive\, require GPS to function reliably\, and are fundamentally limited by what a vehicle can reach. This presentation introduces a different class of technology: SLAM-based mobile LiDAR scanning. Rather than relying on GPS and inertial positioning\, SLAM (Simultaneous Localisation and Mapping) builds a map of the environment in real time and uses that map to track its own position — making it inherently suited to GPS-denied environments such as tunnels\, underpasses\, and confined underground spaces. We’ll explain how SLAM works from first principles\, how it compares to traditional survey methods (total stations\, static TLS) and conventional mobile mapping systems\, and where each approach has genuine advantages. We’ll also discuss SLAM’s limitations: where it struggles\, what affects accuracy\, and the scenarios where traditional methods remain the better choice. Attendees will leave with a grounded\, practical understanding of how SLAM-based mobile LiDAR works\, how it fits alongside conventional survey techniques\, and when it is — and isn’t — the right tool for a tunnel project. \nProgram timeline\nOnline \n5.30pm – Presentation commences \n6.15pm – Q&A \n6.30pm – Presentation concludes \nIn-person \n5.00pm – Registration opens \n5.30pm – Event commences \n6.15pm – Q&A \n6.30pm – Event concludes \nLearning outcomes\n\nWhat SLAM is and how it differs fundamentally from GPS/IMU-based mobile mapping systems\nThe trade-offs between SLAM-based scanning\, conventional MMS\, static TLS\, and total station survey — and how to choose the right approach\nAn overview of Emesent’s Hovermap ST-X and GX1 platforms and how they are deployed in tunnel environments (drone\, vehicle\, backpack)\nWhat real transport tunnel scanning data looks like\, and how it flows from capture through Aura to engineering deliverables\nHonest limitations of SLAM-based scanning and the scenarios where it is not the best fit\n\nAbout the speaker\n\n\n\nStefan Hrabar\nChief Strategy Officer & Co-Founder\, Emesent\n\nDr Stefan Hrabar is Chief Strategy Officer and Co-Founder of Emesent\, a global leader in autonomous mapping technology. With a background in robotics and autonomous systems research at CSIRO\, Stefan co-founded Emesent in 2018 to bring advanced SLAM-based mapping technology to real-world infrastructure and industrial environments. He has worked extensively on the application of mobile LiDAR and autonomous systems in GPS-denied and access-restricted environments\, including tunnels\, mines\, and complex built infrastructure.
URL:https://australiantunnellingsociety.com.au/ats-event/slam-lidar-for-transport-tunnel-surveying/
LOCATION:Online and in person at: Level 9\, 340 Adelaide Street\, Brisbane
CATEGORIES:Online,Queensland
ATTACH;FMTTYPE=image/png:https://australiantunnellingsociety.com.au/wp-content/uploads/2026/05/Screenshot-2026-05-04-122944-e1777861856140.png
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