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| Research on Grout Consolidation Deformation Characteristics of Backfill Grouting of Shield Tunnel |
| YUAN Xiao-Hui, HAN Yue-Wang, ZHONG Xiao-Chun |
| (1. College of Civil and Transportation Engineering, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China; 2. Zhengzhou Rail Traffic Co., Ltd., Zhengzhou 450046, China; 3. College of Civil Engineering, Hohai University, Nanjing 210098, China) |
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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 selfmade 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.
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Received: 30 June 2010
Published: 29 April 2011
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