Stiffness of the ground improved to support the pier of JNLT atop Mauna Kea

Fumio Tatsuoka; Yukihiro Kohata; Hiroshi Karoji; Akihiko Miyashita

doi:10.1117/12.176207

1 June 1994 Stiffness of the ground improved to support the pier of Japan National Large Telescope (JNLT) atop Mauna Kea

Fumio Tatsuoka, Yukihiro Kohata, Hiroshi Karoji, Akihiko Miyashita

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Proceedings Volume 2199, Advanced Technology Optical Telescopes V; (1994) https://doi.org/10.1117/12.176207
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

Abstract

A 2.5 m-thick cinder layer immediately below the pier of Subaru (Japan National Large Telescope, JNLT) now under construction on the summit of Mauna Kea in Island of Hawaii was improved by recompacting volcanic cinders obtained by excavation at the site mixed with cement. The purpose was to increase the Young's modulus at very small strains of the supporting ground to 500 MPa so as to make the lowest natural frequency of the pier-ground system in its rocking motion to be more than 4.3 Hz. This requirement is essential for the telescope control system to correct as quickly as possible for external and internal disturbance of the telescope tracking. The results of the field and laboratory geotechnical tests including the measurements of elastic wave velocities and cyclic triaxial tests, which were performed for the design of the ground improvement work and the prediction and evaluation of the Young's modulus of the constructed layer, are described.

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Fumio Tatsuoka, Yukihiro Kohata, Hiroshi Karoji, and Akihiko Miyashita "Stiffness of the ground improved to support the pier of Japan National Large Telescope (JNLT) atop Mauna Kea", Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); https://doi.org/10.1117/12.176207

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KEYWORDS

Cements

Telescopes

Control systems

Large telescopes

Space telescopes

Turbulence

Velocity measurements

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