Advanced Site Monitoring (2008-2013)
NEESR-II: Advanced Site Monitoring and Effective Characterization of Site Nonlinear Dynamic Properties and Model Calibration
Principal Investigator: Mourad Zeghal
Co-Principal Investigators: Tarek Abdoun, Anirban De (Manhattan College)
This project proposes a research program to develop a capability to characterize and estimate (low and large strain) three-dimensional in situ dynamic properties of sites and other soil systems for strata ranging from ground surface to a depth of about 30m. A n umber of wireless shape-acceleration arrays (WSSA) will be installed permanently with an optimizedconfiguration at the NEES Wildlife Refuge site to monitor low-strain response as well as earthquake induced liquefaction, permanent deformation and lateral spreading. It is highly anticipated that a near-future earthquake will induce large deformation and lateral spreading at this site. The installed arrays would then provide for the first time measurement of the time history of the whole site lateral spreading profile. The shape-acceleration array has capabilities that go beyond those of current state-of-the-art arrays used in monitoring the response of soil-systems.
This array provides accurate remote realtime measurements of permanent three-dimensional displacements along with three-dimensional accelerations. Optimal special instrument configurations (i.e., topology) will be developed for the WSAA to ensure adequate measurements. Innovative data reduction and identification techniques will be developed for systematic site characterization and model calibration. Specifically, this project comprises the following tasks:
- development and validation of optimized array configurations using centrifuge model tests performed at the NEES@RPI and computational analyses,
- permanent installation of a number of wireless shape-acceleration arrays with an optimized configuration at the NEES Wildlife refuge site,
- excitation of the site using the NEES@Texas T-Rex vibrator, and
- development of innovative data reduction and identification tools to estimate the 3-dimensional (small and large strain) mechanical properties and response mechanisms of theWildlife site as well as other field sites that may be instrumented in the future.
Centrifuge Experiment Pictures: