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  3D Subsurface Profile Development Using IDW Method for Tunnel Design

  A subsurface profile is conventionally developed through a 2D cross section and manually interpreted by geotechnical engineers based on limited boreholes. However, the main drawback of this method is that it produces a large variation of results and is not supported by any deterministic interpolation method. This study aimed to eliminate this constraint by using a 3D subsurface model, which was generated using the inverse distance weighting (IDW) algorithm method. This algorithm successfully produced a reliable 3D subsurface model using RockWorks17 software. Besides the 3D soil lithology model, a standard penetration test value (SPT-N) and a pressuremeter modulus (E0 and Eur) were also modeled in this study. However, correlation of the E0 and Eur models with the SPT-N was required to develop reliable 3D models. A tunnel simulation was appended with these models and unique features to export the models to Google Earth, enhance the visualization of the models presented to the client, and assist in a geotechnical monitoring system for ground settlement in tunnel construction.

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