<link rel="stylesheet" href="styles.cf390c6bfbe7555f.css">

學術出版;;Publications

Permanent URI for this communityhdl:11536/1

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.

Browse

🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Lin, Chun-HungSubject: search.filters.subject.Shear wave velocity

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item type:Item,
    Application of surface wave method in assessment of ground modification with improvement columns
    (2017-07-01)
    Lin, Chun-Hung
    ;
    Lin, Chih-Ping
    ;
    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.
  • Thumbnail Image
    Item type:Item,
    Phase velocity approach for Suspension P-S Logging data analysis
    (2016-06)
    Lin, Chun-Hung
    ;
    Lin, Chih-Ping
    ;
    土木工程學系
    ;
    環境工程研究所
    ;
    Department of Civil Engineering
    Due to the short receiver interval, results of Suspension P-S Logging are sensitive to the picking of first arrivals, which is currently carried out by manual picking in the time domain. However, manual picking can be ambiguous and depends heavily on the data quality and analysts\' experiences. Furthermore, no information regarding the effective frequency is obtained from first arrival times. A data reduction method based on phase velocity analysis of borehole acoustic waves is proposed herein. The aim is to provide an automatic procedure for more objective velocity analysis. The procedure utilizes the two-channel dispersion curve analysis, but becomes semi-empirical because an additional assumption is made to simplify the calculation and avoid the phase un-wrapping problem associated with the lack of low-frequency information. Some field data were used to evaluate the empirical parameter for calculating the shear wave velocity. Results show that the velocity difference between the proposed method and the conventional method"based on manually-picked first arrivals is mostly within 15%. The proposed method can be automated and provide the effective frequency of the obtained shear wave velocity. (C) 2016 Elsevier B.V. All rights reserved.