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Phase I: T1a

According to the analytical and numerical analysis, the presence of non-resonating mass (dead-mass) over the soil surface, modify the attenuation performance of the seismic surface waves. During the first phase of the experimental tests, plastic barrels filled with the sand ( approximately 100 kg of mass) are employed and placed over the pristine soil. A non-resonating barrier is realized by a regular grid of 5X10 plastic barrels (2.8 m X 6.3 m) with the spacing of approximately 20 cm. multichannel analysis of surface waves (MASW) is performed across this grid.

T1a_setup_schematics

Phase I: T1a setup

 

  • Grid of 5X10 (2.8 m X 6.3 m) barrels creates a non-resonating barrier.
  • Barrels placed directly over the soil surface. 
  • Excitation source with a variable offset from barrier wavefront at a distance of 4, 6 and 8 meters excite the grid.
  • Different source positions around the barrier perimeter are considered.
  • Sledgehammer and Vibro-impactor are used to generate surface seismic waves.
  • 10 series of tests for each source is recorded.
  • Real-time data recording for the synchronized accelerometers and seismometers (except R1 to R4).

Phase I: T1a

T1a experimental test setup
  • T1a:MASW

    MASW across the 5X10 grid of non-resonating mass over the soil surface (2.8 m X 6.3 m) (dead-mass, T1a settings)

  • T1a:MASW2

    Plastic barrels filled with sand and equivalent weight of approximately 100 kg present dead-masses of setting T01.

  • T1a:MASW-Source

    Vibro-impactor source excites seismic surface waves along the symmetry line of the grid.

  • T1a:MASW-Source2

    Sledgehammer source used for seismic wave excitation at different positions.