_ LANDSLIDES AND SLOPE STABILITY APPLICATION NOTES
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1 _ LANDSLIDES AND SLOPE STABILITY APPLICATION NOTES
2 LANDSLIDES AND SLOPE STABILITY The term landslide describes a wide variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or a combination of these. (USGS, 2004). LANDSLIDE_EN_05_02/2016 A change in the stability of a slope can be caused by a number of factors, acting together or alone, natural (groundwater pressure, toe erosion, earthquake, etc...) or occurring with human activities (blasting, excavations, constructions, etc...) Instrumentation in landslides usually monitors not only the body of the landslide, but also the buildings in the area, the protective structures, the weather parameters and, if needed, seismic parameters. LANDSLIDE TYPES Rotational landslide Translational landslide Lateral slide Rockfall Topple Debris flow AIMS Landslide early warning system (EWS) Monitoring of buildings in or nearby landslide areas Railway and road safety Monitoring performance of protective structures LANDSLIDE AND SLOPES STABILITY 2
3 EXAMPLE OF ROTATIONAL LANDSLIDE MONITORING instrument Purpose Wire crackmeter Monitoring of cracks in rock masses or ground displacement Vented pressure transducer Measurement of water level in standpipe piezometer Digital MEMS in-place inclinometers Monitoring of deep lateral movements in sliding areas Standpipe piezometer (slotted tube) Utilized to measure water table with water level indicator or pressure transducer Casagrande piezometer (blind tube) Pore pressure pressure or water table with water level indicator or pressure transducer Meteorological station Monitoring of meteorological parameters such as rain, wind, temperaure, etc... Water level indicator Monitoring of water table level in standpipe and Casagrande piezometers LANDSLIDE BODY water table level river slipping surface LANDSLIDE AND SLOPES STABILITY 3
4 EXAMPLE OF ROCK mass MONITORING instrument Optical target or miniprism PURPOSE Monitoring displacement with geodetic methods Jointmeter / crackmeter Measurement of small cracks in rock mass or buildings Wire deformometer Surface displacement monitoring in rock masses Borehole extensometer Monitoring subsurface displacements in rock masses Waterproof tiltmeter Monitoring rotation in big rock masses Electric anchor load cell Measure anchor tension POSSIBLE CRACK UNSTABLE ROCK MASS LANDSLIDE AND SLOPES STABILITY 4
5 EXAMPLE OF RETAINING WALL MONITORING instrument BH profile digital inclinometer PURPOSE Monitoring of lateral subsurface movements VW piezometer Monitoring pore-water pressure and over-pressure remediation in soils Tiltmeter (horizontal application) Monitoring rotation of wall Hydraulic anchor load cell Measurement of anchor tension Mexid miniaturized MPBX Monitoring subsurface movement and related deformation of retaining wall target or miniprism Monitoring displacement with geodetic methods RETAINING WALL LANDSLIDE AND SLOPES STABILITY 5
6 OMNIALOG DATA ACQUISITION SYSTEM The OMNIAlog system is designed to be versatile and flexible. By adding modular components to OMNIAlog datalogger, the systems can be configured to handle the simplest or the most complex projects. A single logger, housed in a cabinet with multiplexer expansion boards and a communications interface, can manage a large number of sensors. The systems are easily adapted for different applications by using external multiplexer boxes. Such distributed systems can be connected in a daisy chain or star configuration. Recorded data can be downloaded to a USB memory stick or pushed to remote ftp servers. Alerts can be sent by SMS or , and graphs and reports can be generated on web pages for access anywhere. The WMS is a software platform designed and developed by Field Srl to validate, process, convert, manage, and automatically display data and graphs from geotechnical, structural, dynamic, meteorological and environmental monitoring systems. OMNIAlog and miniomnialog dataloggers, equipped with any communication inteface, send data to a remote server. The server then validates the data, removing spikes and anomalous readings, and processes the readings, converting them to engineering units, and finally adding them to its SQL database. The readings are then made available in the form of charts or tables through the Galemys application. The entire process is automated so that current data is available 24 hours a day, 7 days a week. If a reading value exceeds a preset alarm threshold, the WMS can send an alarm notification via SMS or to the mobile phones of registered users. LANDSLIDE AND SLOPES STABILITY 6
7 for more detailed information on the instruments CLICK ON THE RELATED PICTURE: CASAGRANDE AND STANDPIPE PIEZOMETERS WATER LEVEL INDICATOR VENTED PRESSURE TRANSDUCERS VIBRATING WIRE PIEZOMETERS INCLINOMETER CASINGS INCLINOMETER SYSTEM BH PROFILE ipi INCLINOMETERS Digital Mems in-place inclinometers MPBX BOREHOLE EXTENSOMETER MEXID MINIATURIZED EXTENSOMETERS HYDRAULIC anchor LOAD CELL ELECTRIC anchor LOAD CELL WIRE EXTENSOMETER WIRE deformometer JOINTMETERS OPTICAL TARGETS AND MINIPRISMS TILTMETER waterproof TILTMETER OMNIALOG DATALOGGER WMS WEB MONITORING SYSTEM LANDSLIDE AND SLOPES STABILITY 7
8 MAIN REFERENCE PROJECTS Zumpano slope monitoring, Italy - LIDL Italia ESRC Siberian landslide monitoring, Russian Federation - LLC Geocommerce San Leo Rockfall, Italy - Field Srl Various landslide monitoring, Taiwan - Jovian Engineering Consultant Co. Ltd. Petra archaeological site rockfall, Jordan Maratea rockfall monitoring, Italy - S.M.A. S.p.a. Various Landslides monitoring for Sochi Olympic Games, Russia - AGT Systems Sibiu Landslide monitoring, Romania - Astaldi SPA Succ. Romania Miglionico Landslide monitoring, Italy - S.M.A. S.p.a. Stuttgard landslide monitoring, Germany - Geomesstec Pipeline Slope monitoring, Greece - DEPA Co. Crocefieschi-Busalla rock masses monitoring, Italy - Campra Rocciatori Landslide monitoring in Sakhalin II project, Russia - AGT Systems Molunghi landslide monitoring, Italy - Provincia La Spezia Wire crackmeter installed in Petra archaeological site, Jordan Waterproof tiltmeter installed on Vico Equestre rock wall, Italy Wire extensometer installed in Maratea rockfall, Italy RELATED VIDEO Landslide monitoring instrumentation, Sisgeo video presentation SISGEO s.r.l. Via F. Serpero 4/F Masate (MI) Italy Phone Fax info@sisgeo.com All the information in this document is the property of Sisgeo S.r.l. and should not be used without permission from Sisgeo S.r.l. We reserve the right to change our products without prior notice. The datasheet is issued in English and other languages. In order to avoid discrepancies and disagreement on the interpretation of the meanings, Sisgeo Srl declares that English Language prevails. LANDSLIDE AND SLOPES STABILITY 8
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