“And Then, the Weekend Started”: Story of a WSN Deployment on a Construction Site

Fernández-Steeger, Tomás Manuel; Ceriotti, Matteo; Link, Jó Ágila Bitsch; May, Matthias; Hentschel, Klaus; Wehrle, Klaus

doi:10.3390/jsan2010156

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…subsidence in an open pit mine (Fernandez-Steeger et al, 2013) besides landslide surveillance. Instead of using previous SLEWS nodes provided by ScatterWeb as a black box, we implemented the popular open-source operating system TinyOS that is targeted at sensor network applications on the X-SLEWS platform.…”

Section: Sensor Networkmentioning

confidence: 99%

Use of MEMS accelerometers/inclinometers as a geotechnical monitoring method for ground subsidence

Li¹

2014

Acta Geodynamica Et Geomaterialia

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Accelerometer and inclinometer are inertial sensors capable of measuring corresponding magnitude of Earth gravitational field along the direction of each axis. By means of rotation matrices related to inertial navigation methods, the output values of a three-dimensional accelerometer or a two-dimensional inclinometer can be transformed and processed into the azimuth and dip angle of the monitored target. With the rapid growth in development and cost reduction of Micro Electro Mechanical Systems (MEMS) and Wireless Sensor Network (WSN) in recent years, the engineers are able to carry out real-time wireless geotechnical monitoring during construction. In this paper, we set up a one-day measurement implemented by a selfdeveloped wireless MEMS monitoring system on the surface in the construction site of South Hongmei Road super high way tunnel in Shanghai, by making use of rotation matrices in specific ways, the raw data are processed to expressions of three-dimensional normal vectors that represent the change of the ground. After unifying the vectors in the same coordinate system, we conduct a brief ground settlement analysis by means of an evaluation of the dip angles in the cross section and the azimuths of the sensor nodes.

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Section: Sensor Networkmentioning

confidence: 99%

Use of MEMS accelerometers/inclinometers as a geotechnical monitoring method for ground subsidence

Li¹

2014

Acta Geodynamica Et Geomaterialia

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“…A self-organizing and multi-hop wireless monitoring network was created thereby [ 6 , 7 ]. This wireless monitoring system and its predecessor system X-SLEWS [ 8 ] have been applied to monitor several kinds of natural hazards and geotechnical activities such as tilting of rock towers deformation [ 9 ], ground subsidence due to ground improvement measures [ 10 ], tunneling construction [ 11 ], and landslide monitoring [ 12 ]. Figure 1 exhibits the main components of the X-SLEWS network.…”

Section: Introductionmentioning

confidence: 99%

Kalman Filters in Geotechnical Monitoring of Ground Subsidence Using Data from MEMS Sensors

Li¹,

Azzam

Fernández-Steeger

2016

Sensors

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The fast development of wireless sensor networks and MEMS make it possible to set up today real-time wireless geotechnical monitoring. To handle interferences and noises from the output data, Kalman filter can be selected as a method to achieve a more realistic estimate of the observations. In this paper, a one-day wireless measurement using accelerometers and inclinometers was deployed on top of a tunnel section under construction in order to monitor ground subsidence. The normal vectors of the sensors were firstly obtained with the help of rotation matrices, and then be projected to the plane of longitudinal section, by which the dip angles over time would be obtained via a trigonometric function. Finally, a centralized Kalman filter was applied to estimate the tilt angles of the sensor nodes based on the data from the embedded accelerometer and the inclinometer. Comparing the results from two sensor nodes deployed away and on the track respectively, the passing of the tunnel boring machine can be identified from unusual performances. Using this method, the ground settlement due to excavation can be measured and a real-time monitoring of ground subsidence can be realized.

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“…Currently emerging areas for WSN applications in geosciences are hazard monitoring (Hartung et al 2006;Beutel et al 2009;Ramesh and Vasudevan 2012;Werner-Allen et al 2006) but also construction and construction site monitoring for safety reasons (Picozzi et al 2009;Stoianov et al 2007;Kim et al 2007;Fernandez-Steeger et al 2013). An emerging field for monitoring tools will be the safety analysis, where besides deterministic models, the observation method defining thresholds, becomes in large and limit testing projects more important.…”

Section: Wireless Sensor Networkmentioning

confidence: 99%

Wireless Sensor Networks and Sensor Fusion for Early Warning in Engineering Geology

Fernández-Steeger

et al. 2015

Engineering Geology for Society and Territory - Volume 2

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Due to the large complexity, interactions and feedback effects of geo-processes directly influencing our live, there is an increasing need for information and monitoring of our environment. For this tasks wireless sensor networks (WSN) are expected to provide future solutions for observation tasks, which can not be covered by current monitoring systems. Especially their ability to establish ad hoc networks, real-time skills, cable-less communication, low energy consumption and self-healing are of special interest. Besides this the option to observe processes with networks of sensors allows to enhance information retrieval in geomonitoring applying multi data sensor fusion. Especially the JDL sensor fusion concept provides a framework in which the whole chain of a monitoring and early warning system can be realized, considering also internal feedbacks and interaction with external operators. The major advantage is that this allows overcoming static safety concepts or threshold definitions and replaces them by a dynamic safety assessment including predictions of future states.

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“And Then, the Weekend Started”: Story of a WSN Deployment on a Construction Site

Cited by 5 publications

References 5 publications

Use of MEMS accelerometers/inclinometers as a geotechnical monitoring method for ground subsidence

Use of MEMS accelerometers/inclinometers as a geotechnical monitoring method for ground subsidence

Kalman Filters in Geotechnical Monitoring of Ground Subsidence Using Data from MEMS Sensors

Wireless Sensor Networks and Sensor Fusion for Early Warning in Engineering Geology

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