Geophysics-assisted control and evaluation of ground improvement

Chih Ping Lin, C. H. Lin, P. L. Wu, H. R. Wang, H. C. Liu

Research output: Contribution to conferencePaperpeer-review

Abstract

There is an increasing demand in geotechnical construction business for process monitoring and construction control. The non-destructive nature and subsurface imaging capability of geophysical methods are what is needed for such applications. Jet grouting in particular is an important underground construction technique that channels cement grout suspension with a high pressure jet nozzle into surrounding soils to cut through the soils and form a soilcrete column. This paper uses jet grouting as an example to demonstrate the importance of fully taking engineering considerations into account for the planning and interpretation of geophysical surveys. The in-hole ERT (electrical resistivity tomography) is proposed to assess diameter profile of soilcrete column, which is critical in pilot construction and when jet grouting is used to create a barrier. For evaluating the overall area replacement ratio (degree of reinforcement) when jet grouting is used to reinforce soft soils, seismic surface wave is suggested. For both purposes, quantitative interpretation with engineering precision is proposed.

Original languageEnglish
StatePublished - 2020
Event16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019 - Taipei, Taiwan
Duration: 14 Oct 201918 Oct 2019

Conference

Conference16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019
CountryTaiwan
CityTaipei
Period14/10/1918/10/19

Keywords

  • Electrical resistivity tomography (ERT)
  • Ground improvement
  • Jet grouting
  • Surface wave

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