A SMALL EXPLOSIVE SIMULATION OF EARTHQUAKE-LIKE GROUND MOTIONS

A small experiment, assigned the test name MINI-SIMQUAKE, was conducted to verify the technical feasibility of sequentially detonating closely spaced planar arrays of high explosives for the purpose of simulating earthquake-like ground motions. The experiment contained two explosive arrays which were detonated 0.3 sec apart. Ground motions and the response of a small cylindrical structure were measured with accelerometers and velocity gages. In addition, an angular displacement measurement was made in the structure. The experiment demonstrated that enhancement of the time duration and number of motion cycles of explosive experiments is feasible and practical with time sequenced explosions. The behavior of the arrays indicated that careful attention must be paid to array separation and firing system details. The measured ground motions significantly expanded the available data base for planar explosions so that ground motions from planar experiments in alluvium appear predictable with a reasonable level of confidence. The experiment excited strong rocking behavior in the model structure which indicated a fundamental strain level soil properties. Soil strains were larger than 2 percent in the experiment and these strains are well into the inelastic region for the site soils. Comparisons of measured spectra with scaled prototype design spectra indicate that structure rocking response may have been on the order of that implied by a idealized 1/2g design spectrum. /Author/

Media Info

  • Features: Figures; References;
  • Pagination: p. 512-529

Subject/Index Terms

Filing Info

  • Accession Number: 00179764
  • Record Type: Publication
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM