Property of backfilling injection into tail void including lubricant behavior for pipe jacking

Takashi Senda, Hideki Shimada, Takashi Sasaoka, Kikuo Matsui, Shuichi Fujita, Akihiro Hamanaka, Yasuhiro Yoshida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Lubrication can effectively reduce necessary thrust for over-cutting if a discrete layer of the lubricant is maintained between the pipe and the excavated soil. The lubricant must be designed to form a layer in the surrounding soil, be pressurized to overcome underground water pressure and stabilize the over-cutting area. The lubricant should fill the complete over-cutting area to minimize surface settlement. However, it has been clarified that for a commercial lubricant to be effective, the ingredients such as sodium and potassium should be eliminated. As a result, for a lubricant not to lose its function as a support against the overburdening pressure of an over-cutting area (hereinafter referred to as tail void) and to enable a reduction in thrust, it is necessary to develop a better quality lubricant that can overcome these problems as soon as possible. From this perspective, a lubricating material comprised of a mixture of surfactant and fly ash was developed. This report focuses attention on minimizing soil deformation. In particular, to stabilize the layer in tail void between the pipe and the excavated soil and to examine the characteristics of material attributes to avoid reduction in thrust, a variety of experiments were performed using both traditional lubricating materials and a new material mixed with fly ash.

Original languageEnglish
Title of host publication30th International No-Dig Conference and Exhibition 2012, No-Dig Sao Paulo 2012
Pages162-171
Number of pages10
Publication statusPublished - Dec 1 2012
Event30th International No-Dig Conference and Exhibition 2012, No-Dig Sao Paulo 2012 - Sao Paulo, Brazil
Duration: Nov 12 2012Nov 14 2012

Publication series

Name30th International No-Dig Conference and Exhibition 2012, No-Dig Sao Paulo 2012

Other

Other30th International No-Dig Conference and Exhibition 2012, No-Dig Sao Paulo 2012
CountryBrazil
CitySao Paulo
Period11/12/1211/14/12

All Science Journal Classification (ASJC) codes

  • Geology
  • Geophysics
  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering
  • Mechanical Engineering
  • Building and Construction

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  • Cite this

    Senda, T., Shimada, H., Sasaoka, T., Matsui, K., Fujita, S., Hamanaka, A., & Yoshida, Y. (2012). Property of backfilling injection into tail void including lubricant behavior for pipe jacking. In 30th International No-Dig Conference and Exhibition 2012, No-Dig Sao Paulo 2012 (pp. 162-171). (30th International No-Dig Conference and Exhibition 2012, No-Dig Sao Paulo 2012).