基於完整波場模擬的表觀頻散曲線特徵探討

Characteristics of Apparent Dispersion Curve Based on Complete Wavefield Simulation

歐美蘭(Almira Sufwandini Putri)

指導教授 ： 林志平

國立交通大學/工學院/土木工程系所/碩士(2020年)

摘要

本研究將探討表面波震測方法，作為提供大地工程師地下土壤結構資訊的手段。表观頻散曲線常用以作為剪力波速剖面之反算基礎，為了使表面波震測方法更為發展應用，本研究將檢視不同地層狀況下，表观頻散曲線和理論模態頻散曲線之匹配情形，並進一步檢視該頻散曲線利用簡易反算法(SIM)所反算的剪力波速剖面。

本研究中所用的地層模型分為三大類：簡易二層地層模型、三層地層模型以及更為複雜的四層模型，並以多頻道表面波震測法為研究標的以取得頻散曲線，其中視頻散曲線乃基於MultiSMART 3D的動態反應結果，理論模態頻散曲線則藉由MASWaves的勁度矩陣法計算。

關鍵字

表观頻散曲線 ； MASW ； MultiSMART 3D ； SIM

並列摘要

This study reserved for the geophysical engineers striving to read the description of soil structure as the application of surface wave analysis. The fundamental mode of the apparent dispersion curve is well known used to construct the velocity difference between the soil layer. In order to participate in supporting the development of surface wave analysis in the seismic method, this study examines characteristics of the apparent dispersion curve as opposed to the modal dispersion curve occurred at various soil layer model. Through the dispersion curve in each different soil layer model, this study also investigates the reliability of a simplified inversion (SIM) technique for estimating the shear wave velocity profile.

The layer profile model used in this study contained simple 2-Layer profiles, various 3-Layer profiles, and complex 4-Layer profiles. This present research works at multichannel analysis of surface wave (MASW) Method to constructing the vph-λ dispersion curve. Soil dynamic response of each layer is obtained with a complete wavefield solution by MultiSMART 3D for apparent dispersion curve experimentally, and stiffness matrix method in MASWaves for modal dispersion curve theoretically.

並列關鍵字

Apparent dispersion curve ； MASW ； MultiSMART 3D ； SIM

參考文獻

[1] Olafsdottir, E., Bessason, B., and Erlingsson, S., “Combination of Dispersion Curves from MASW Measurements,” Soil Dynamics and Earthquake Engineering, vol. 113, pp. 473-487, October 2018.

[2] Liu, H., and Pan, E., “Time Harmonic Loading Over Transversely Isotropic and Layered Elastic Half Space with Imperfect Interfaces,” Soil Dynamics and Earthquake Engineering , vol. 107, pp. 35-47, 2018.

[3] Pelekis, P. C., and Athanasopoulos, G. A., “An Overview of Surface Wave Methods and A Reliability Study of a Simplified Inversion Technique,” Journal of Soil Dynamics and Earthquake Engineering, vol. 31(12), pp. 1654-1668, 2011.

[4] Foti, S., et al., “Guidelines for The Good Practice of Surface Wave Analysis,” A Product of The Inter PACIFIC Project, Bull Earthquake Eng, vol. 16, pp. 2367-2420, 2018.

[5] Lai, C. G., Foti, S., and Rix, G. J., “Propagation of Data Uncertainty in Surface Wave Inversion,” Journal Environment Engineering Geophysic, vol. 10(2), pp. 219-228, June 2005.