Engineering & Mining Journal

NOV 2018

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SLOPE STABILITY 36 E&MJ • NOVEMBER 2018 www.e-mj.com technologies — 3D Real Aperture Radar, 2D Real Aperture Radar and 2D Synthet- ic Aperture Radar — as well as the new LiDAR-based technologies, the Geotech Monitoring Station (GMS) and Geotech Monitoring LiDAR (GML). Maptek Makes Its LiDar System Mobile Also on display at the Slope Stability conference was Maptek's Sentry LiDAR system. First introduced in 2014, the Sentry system — combining an I-Site laser and software — was re-launched last year as a fully transportable package for detecting ground movement. Leading features of the new system, according to Maptek, include: • Ability to monitor multiple zones within a scene without the need for targets or reference points. Movement can be detected down to 1 mm per hour. • Most cost effective when used to scan and monitor several zones concurrent- ly. Visualization and analysis tools can be readily deployed for monitoring on a broader scale before using radar assets if required. • Time-lapse capability allows users to see changes and use this information to predict movement in other areas. Heat maps colored by displacement or velocity provide an overview of surface movement. • Alert levels and rules are easily defined, allowing critical information to be sent directly to geotechnical staff or mine managers so they can decide on an action to be taken. • The laser scanner can be moved for oth- er tasks, and monitoring history is main- tained when the unit is returned to the same fixed monitoring position. • Animation of zones to show morphology of terrain changes over time. In a recently published case history, Maptek reported implementation of the first Sentry system in Peru was carried out over three days in late 2017 at the Shougang Hierro Perú S.A.A. iron ore mine about 520 km south of the capital, Lima. The deposit covers approximately 150 km 2 . According to Maptek, the mine's geo- technical department needed to imple- ment a slope-monitoring system for active pits, providing greater awareness of areas showing signs of instability. Favorably in- fluencing the mine's decision to adopt Sen- try, said Maptek, was its ability to generate queries from different areas, providing knowledge of the full history of potential instabilities in sectors where geotechnical information was not available. In addition, the ease of installing the system at differ- ent locations met the mine's expectation of being able to use the I-Site XR3 laser scanner for other survey applications. Maptek said the implementation at Shougang took place in a staged se- quence, starting with delivery of equip- ment and accessory requirements for op- timal installation of the system, through to completion of the training. • Day 1 of the implementation required Shougang to provide accreditation pass- es, a safety induction, the equipment checklist, and installation of the Sentry system at the monitoring point. • On the following day, Maptek gave a Sentry presentation to Shougang per- sonnel, and assisted in setting up the areas of interest, the Wi-Fi network con- nection for remote monitoring, and a test run definition of alert parameters. • The final day included checking re- mote access, theoretical training for Shougang personel, practice using the Sentry System, and wrap-up of the implementation. New Software Brings Faster Data Analysis In September, IDS GeoRadar announced that it was partnering with Rocscience to integrate deformation monitoring data from IDS's slope monitoring radars into slope stability numerical models in Roc- science's Slide3 and RS3 software. This integration, according to IDS GeoRadar, is a first in the industry and a step forward toward intelligent slope design. IDS Geo- Radar, an Italian company, is part of the Hexagon group. The company said the next releases of Slide3 and RS3 will allow users to overlap radar maps onto numerical model results using the georeferencing data imported from IDS GeoRadar interferometric ra- dars. The latest ArcSAR technology now makes it possible to capture deformations every minute on the entire slope. IDS GeoRadar said its ArcSAR is the first and only radar in the mining in- dustry to provide 360° pit coverage from a single equipment unit. The system offers long-range capabilities (5,000 m) along with short scan time (360° in 40s; 180° in 20s) and built-in GNSS for auto-geocoding. According to IDS GeoRadar, these advances will lead to faster geotechni- cal analysis. The radar data will be in- tegrated through a streamlined workflow that will allow geotechnical engineers to focus on modeling and slope analy- sis rather than waste time importing and converting files. Maptek's Sentry system is deployed in a custom trailer providing a power and communications module, with cellular and Wi-Fi networking. Users can customize monitoring frequency and thresholds.

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