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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Subject: search.filters.subject.MASW

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Now showing 1 - 5 of 5
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    Geotechnical applications and standardization of surface wave method-from engineer's perspective
    (2010-01-01)
    Lin, Chih-Ping
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    Lin, Chun-Hung
    ;
    Chang, Tzong-Sheng
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    土木工程學系
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    Department of Civil Engineering
    This paper focuses on the power and concerns of surface wave method in geotechnical applications. It is increasingly used to map not only the vertical variation but also the lateral variation of S-wave velocity. The methods available for surface wave testing and analysis are reviewed and re-examined. Case histories are presented to highlight unique features of surface wave method and point out potential problems. The solution to those problems is proposed and further standardization of surface wave testing is suggested.
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    Dispersion analysis of surface wave testing - SASW vs. MASW
    (2017-08-01)
    Lin, Chih-Ping
    ;
    Lin, Chun-Hung
    ;
    Chien, Chih-Jung
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    交大名義發表
    ;
    National Chiao Tung University
    The data reduction method for dispersion relation in surface wave testing is conventionally associated with the certain method of data acquisition, for example, phase shift analysis in the two-station SASW method and 2-D multi-station wavefield transformation of surface wave in the MASW method. The fundamental difference in dispersion analysis between the 2-station and multi-station approach was clarified in this study. Limited to the two channel data, conventional dispersion analysis of SASW suffers from possible phase un-wrapping errors, inefficient data filtering and synthesis, and inability to distinguish multiple modes. The MASW approach, on the other hand, can avoid these problems and provide visualization of dispersion relation through 2D wavefield transformation. As opposed to multiple shots in the SASW testing, the MASW testing typically uses only single shot, limiting the obtainable wavelengths due to near field and far field effects. Combining the merits of these two methods, a multi-shot common receiver configuration survey is proposed to acquire multi-station wavefield for 2D wavefield transformation using as few as two receivers. An additional benefit of the multi-shot common receiver configuration is shown to be better control and higher lateral resolution of the measurement range. (C) 2017 Elsevier B.V. All rights reserved.
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    Application of surface wave method in assessment of ground modification with improvement columns
    (2017-07-01)
    Lin, Chun-Hung
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    Lin, Chih-Ping
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    Dai, Yung-Zheng
    ;
    Chien, Chih-Jung
    ;
    交大名義發表
    Surface wave testing is considered a promising method for assessing average property and actual area replacement ratio of ground modification with improvement columns, owing to its non-destructive nature and large sampling range. However, the surface wave method is essentially a 1-D method assuming horizontally-layered medium. What it measures in highly heterogeneous improved ground remains to be investigated. This study aimed at evaluating the feasibility of surface wave method in the heterogeneous ground with improved columns, and investigating the homogenization of shear wave velocity and the lateral sampling range. Field tests on a jet grouted construction site showed that the surface wave method worked well in such heterogeneous grounds and yielded a site-representative shear wave velocity profile regardless of the survey location. This is attributed to the survey condition where the wavelength is greater than the spacing of grout columns. 1-D analytical models and 2-D numerical simulations were conducted to investigate the quantitative relation between construction parameters and the percentage increase of shear wave velocity after ground improvement. A quantitative approach to estimate the area replacement ratio and overall quality of improvement columns by surface wave testing is proposed. (C) 2017 Elsevier B.V. All rights reserved.
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    Characterization of Electrical Properties by Time Domain Reflectometry
    (2014-01-01)
    Lin, Chih-Ping
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    Lin, Chun-Hun
    ;
    Chung, Chih-Chung
    ;
    Liu, Hsin-Chan
    ;
    土木工程學系
    The monitoring and mapping of contaminated soil frequently involve geophysical prospecting methods as a complement to conventional geological, chemical and hydrological studies. Non-destructive geophysical techniques help to rapidly detect contaminants in soils and to monitor the extension of polluted areas. To go beyond structure characterization to composition and process interpretation, it is necessary to understand the relationship between the electrical properties of contaminated soils and soil compositions including the pollutants. The objective of this study is to develop a broadband measurement technique for more complete electrical characterization of contaminated soil including complex dielectric permittivity and electrical conductivity. The development is based on the time domain reflectometry, which is suitable for both laboratory and field measurements. The measurement system is easy to set up, calibrate, and operate to facilitate more investigations of electrical properties of various contaminated soil in relation to soil composition and contaminant content. It is also this study\'s intention to develop a technique that can be easily adapted to penetration probe for field investigation and monitoring.
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    Metamorphosing the SASW Method by 2D Wavefield Transformation
    (2012-08-01)
    Lin, Chun-Hung
    ;
    Lin, Chih-Ping
    ;
    交大名義發表
    ;
    National Chiao Tung University
    Dispersion analysis in surface wave testing is conventionally associated with a certain method of data acquisition, such as phase angle analysis in the two-station spectral analysis of surface wave (SASW) method and two-dimensional (2D) multistation wavefield transformation in the multistation analysis of surface wave (MASW) method. A new procedure has been developed to reconstruct the SASW data as MASW-imitating data, taking advantage of the 2D multistation wavefield transformation to better analyze the SASW data. Numerical simulations and a real-world example demonstrate the feasibility of this procedure, but also reveal an unwanted side effect associated with aliasing. A common-receiver survey is proposed for future experiments to eliminate this unwanted side effect and at the same time increase the lateral resolution. DOI: 10.1061/(ASCE)GT.1943-5606.0000657. (C) 2012 American Society of Civil Engineers.