Geophysical Characterization for the Proposed Metro Manila Subway

Author: Roy Anthony C. Luna, MSCE, Ramon D. Quebral, PhD, John Michael B. Gargullo, MSCE, Karen Joy R. Leobrera, MSCE, Patrick Adrian Y. Selda, Emmanuel D. Marasigan, Maria Deandra C. Andal, Francis Jenner T. Bernales

Presenter: (For presentation)

Part of the comprehensive geological and geotechnical investigation for the proposed Metro Manila subway is the conduct of geophysical testing to estimate the dynamic properties of soil and rock underlying the alignment. This consists of seismic downhole tests, and seismic velocity logging using P-S suspension logger on several boreholes along the alignment. This paper focuses on the results of seismic velocity logging conducted in sixty (60) boreholes located along the proposed subway alignment. The obtained shear wave velocity measurements show that the subsurface surrounding the opening for the proposed subway alignment is generally underlain by soft rock to rock formations with a representative V_s of 779.72 m/s, which falls in the borderline of S_C and S_B soil profile types. The results are consistent with the published V_s30 site model map by the Philippine Institute of Volcanology and Seismology (PHIVOLCS) and the Unconfined Compression Tests (UCT) conducted in the core samples obtained from the geotechnical investigation. The results are expected given that the alignment is underlain by Guadalupe Tuff Formation.

Conference/s:

6th International Conference on Geotechnical and Geophysical Site Characterization – Budapest, Hungary (2021)

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