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  Backfill grouting with two-component grout - Case study Tehran metro line 7 east-west lot

  In Tehran metro line 7 east-west lot an EPB-TBM has been chosen to perform the excavation of the tunnel. In this project, excavating diameter is 9.14 meters and outer diameter of segments (with 35 cm width) is 8.85 meters, with considering to placement of segments, the width of annular gap (tail void) is 29 cm that should be filled with grout. Based on the hydrology studies, 65 percent of tunnel route is placed in saturated area. For this reason, the key (main) characteristics of injected grout in this section of tunnel are washout resistance and stability against water. The objective of this paper is to develop experiment designs to improve the consistency and stability of grout against water and provide the optimum mix design plan with evaluate and optimize the parameters.

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