You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    Volume 40, Issue 5 (September 2017)

    Quantitative Investigation on Grouting Quality of Immersed Tube Tunnel Foundation Base using Full Waveform Inversion Method

    (Received 4 August 2016; accepted 20 March 2017)

    Published Online: 2017

    CODEN: GTJODJ

      Format Pages Price  
    PDF (1.51 MB) 13 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    Full waveform inversion (FWI) method is used to reveal the internal structure of underground mediums in geotechnical engineering. It comprehensively utilizes the amplitude, travel time, and phase of a wave field. It also offers the potential to produce better resolution of the target medium and feasibility for the detection of buried low-velocity layers. A new FWI method for elastic waves in stratified mediums is presented, which adopts a quasi-linear method coupled with a random search algorithm. The strength of this approach is that the Jaccobian matrix is iteratively calculated instead of the Hession matrix, and the inversion work is helpful for getting out of the local minima within appropriate search scope. To verify our method, it is applied to numerical 2-D stratified models and the appropriate search step and range constraint for inversion are determined by parameter sensitivity analysis. With a series of waveform pretreatments, including filter process, waveform energy normalization, and waveforms mitigation based on correlation analysis, we extended it to use with 3-D stratified media models. Its feasibility and accuracy in recovering the unknown parameters of low-velocity layers are certified. Based on the results of the numerical cases, this FWI method can be used for detecting the grouting quality in immersed tube tunnels. The S-wave velocity profiles of low-velocity layers under the tunnel floor are obtained. Because the S-wave velocities of grouting layers will increase before and after grouting, the grouting quality is effectively evaluated by the FWI method and provides a practical reference for other similar projects.

    Author Information:

    Wang, Huan
    School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai,

    Che, Ailan
    School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai,

    Feng, Shaokong
    School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai,


    Stock #: GTJ20160186

    ISSN:0149-6115

    DOI: 10.1520/GTJ20160186

    Author
    Title Quantitative Investigation on Grouting Quality of Immersed Tube Tunnel Foundation Base using Full Waveform Inversion Method
    Symposium ,
    Committee D18