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Dynamic Elastic Moduli Modeling based on Seismic Refraction and MASW Methods

Originally published: 3rd Asia Pacific Meeting on Near Surface Geoscience & Engineering, 2020 Co-authors: R. Rizqulloh, E. Rinanto, T. Haryanto, M. Dhiwaurrais Case Study: The New Building Project in University

Abstract

This study characterizes subsurface conditions for a university building project using advanced geophysical techniques. By integrating seismic refraction and Multi-channel Analysis of Surface Waves (MASW), we modeled critical dynamic elastic moduli required for robust foundation design and load-bearing assessment.

Methodology

The research employed a dual-method approach to capture a complete profile of the subsurface:

  • Seismic Refraction: Used to determine the compressional-wave velocity (Vp).
  • MASW (Multi-channel Analysis of Surface Waves): Used to determine the shear-wave velocity (Vs).

From these velocities, key dynamic elastic moduli were calculated, including Young’s modulus (E), Shear modulus (G), Bulk modulus (K), and Poisson’s ratio (µ).

Key Findings

  • Subsurface Profiling: The investigation revealed distinct weathering layers overlaying unweathered granitic rock.
  • Site Suitability: Analysis of Vp and Vs values showed that the northwest portion of the survey area contained higher unweathered solid rock layers.
  • Foundation Design: The northwest area was identified as more suitable for the building's foundation due to its significantly higher load-bearing capacity and elastic moduli.

This is a summary of the academic publication as part of Luthfi Yufajjiru's research archive.