Application of the MASW Method to Know the Road Stiffness Structure By Using Accelerometer Sensors
A surface wave method is often used to map shear wave velocity variation of soil with depth. However, measured seismic wave field usually contains such unfavorable waves as higher modes of surface waves, body waves, and ambient noise. These waves can significantly influence results of the analysis i...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/11072 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | A surface wave method is often used to map shear wave velocity variation of soil with depth. However, measured seismic wave field usually contains such unfavorable waves as higher modes of surface waves, body waves, and ambient noise. These waves can significantly influence results of the analysis if not properly handled. In an attempt to increase confidence in the interpreted Vs profile as a result of the ambiguity in the analyzed dispersion characteristics, multichannel method is used in this research to characterize the structure of road stiffness on the PU Cikampek. The MASW method originated from the traditional seismic exploration approach that employs multiple (twelve or more) receivers placed along a linear survey line. Main advantage is its capability of recognizing different types of seismic waves based on wave propagation characteristics such as velocity and attenuation. The MASW method utilizes this capability to discriminate the fundamentalmode Rayleigh wave against all other types of surface and body waves generated not only from the seismic source but also from the ambient site conditions. Rayleigh wave is one of surface wave that commonly used to identify near surface layering structure. In what called heterogen medium, Rayleigh is dispersive with frequency function velocity, it can be used to structurized earth layering model based on shear wave velocity (Vs) versus depth (h). The inversion of MASW method which is used to land profiling resulting model and dispersion curve matching in shear waves velocity as depth function. At this final project, data is taken in the project of PU Cikampek by active method that used near offset 2 meters. Inversion processing has done by SWAN. At this line, the asphalt is indicated hard enough which has shear wave velocity at 273 m/s. |
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