Research on Grout Consolidation Deformation Characteristics  of Backfill Grouting of Shield Tunnel

Abstract

Abstract: Abstract： In order to investigate consolidation deformation characteristics of grout in shield tail void, the changing regulars were tested under different consolidation pressures, different grout material mix ratios, surrounding soil type, and groundwater pressures utilizing the selfmade consolidation deformation device. With consolidation pressure increasing, consolidation rate is accelerated, and ultimate deformation is bigger accordingly. Ultimate strain of consolidation varies between 4% and 12%. Consolidation deformation rate in sandy soil is faster than that in clay soil. Grout consolidation deformation can be stabilized within about 1 hour in sandy soil, which needs 5~6 hours in clay soil. With the water pressure increases, grout drainage rate slows, the final consolidation deformation reduces accordingly. Groundwater pressure hinders grout drainage, reduces the rate of consolidation deformation.

Key words: shield tunnel, backfill grouting, consolidation, deformation

CLC Number:

U451

YUAN Xiao-Hui, HAN Yue-Wang, ZHONG Xiao-Chun. Research on Grout Consolidation Deformation Characteristics of Backfill Grouting of Shield Tunnel[J]. Journal of Shanghai Jiaotong University, 2011, 45(04): 446-450.

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Research on Grout Consolidation Deformation Characteristics of Backfill Grouting of Shield Tunnel

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