Geotechnical Monitoring Systems: The New Multi-Parametric DMS Columns - The Importance of the Testing in Lab and in Field For Reliability and Data Interpretation in the Early Warning Applications

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Abstract: The increased sensitivity towards the hydrogeological risk and the perception of the residual risk has led to consider the continuous geotechnical stability monitoring as a relevant risk mitigation factor through dedicated models and specific procedures for early warning.

Moreover the guidelines for design in geotechnical sector in particular contexts complexity point out the importance of the application of the observational method to monitor the stability in all phases from the design, construction, structural testing to the post-construction; the answer to these guidelines may be provided by the modern geotechnical monitoring systems with the use of multi-parametric instrumentation.

CSG is the leader in multi-parametric monitoring field for early warning applications, having with its patents in the year 2000 introduced in addition to the multi-inclinometer also the multi-parametric system. DMS® (acronym of Differential Monitoring of Stability) is an automatic in-place geotecnical monitoring system 2D/3D for the stability real time monitoring of landslides, cuttings and engineering works, installed up to 250 m extension, fully instrumented for early warning applications.

The instruments are an evolution of the traditional in place inclinometers (IPI), with the realization of the columnar instruments it is possible to overcome limitations in terms of extensions of the investigated zones. However, this new generation of geotechnical monitoring systems because of the column length and the freedom from grooves, are not manageable with the testing procedures applied for the traditional instrument, and therefore requires special attention in the construction phase and proper specific testing/calibration in lab and in testing field. The paper describes the know how specifically developed with the alignment problems that may arise in the line connection of numerous inclinometric sensors, through the design and construction of specific machines for mechanical assembly and automatic alignment of the joints and through specific software procedures for sensors calibration and testing.

Mario Lovisolo

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