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Experimental Study on Mix Proportions of Synchronous Two-component Grouting for Shield Tunnels
(1 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 2 National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation, Chengdu 610031; 3 College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024)
Abstract Synchronous grouting plays a vital role in controlling of ground subsidence in the construction of shield
tunnels. In order to improve the workability of grout for synchronous grouting, using water, cement, bentonite, stabilizer and water glass as raw materials, an experimental study was conducted by control variate method, and the effects of mix proportions of two-component grout on setting time, fluidity, bleeding rate, elasticity modulus and compressive strength were studied, with the results showing that compressive strength is much affected by water cement ratio but the bleeding rate was less affected by water cement ratio, the best water cement ratio of liquid A is 2.40 when it only considers compressive strength; when water cement ratio is constant, the setting time of two-component grout increases gradually with an increase of water glass content and the compressive strengths after 1 h, 1 d, 7 d, 28 d increase at first and then decrease; when the content of water glass is constant, the elasticity modulus of two-component
grout sample decreases at first and then decreases after 28 d with an increase of water cement ratio; when the water cement ratio is constant, the elasticity modulus of two-component grout sample after 28 day increases with an increase of water glass content.
Abstract：
Synchronous grouting plays a vital role in controlling of ground subsidence in the construction of shield
tunnels. In order to improve the workability of grout for synchronous grouting, using water, cement, bentonite, stabilizer and water glass as raw materials, an experimental study was conducted by control variate method, and the effects of mix proportions of two-component grout on setting time, fluidity, bleeding rate, elasticity modulus and compressive strength were studied, with the results showing that compressive strength is much affected by water cement ratio but the bleeding rate was less affected by water cement ratio, the best water cement ratio of liquid A is 2.40 when it only considers compressive strength; when water cement ratio is constant, the setting time of two-component grout increases gradually with an increase of water glass content and the compressive strengths after 1 h, 1 d, 7 d, 28 d increase at first and then decrease; when the content of water glass is constant, the elasticity modulus of two-component
grout sample decreases at first and then decreases after 28 d with an increase of water cement ratio; when the water cement ratio is constant, the elasticity modulus of two-component grout sample after 28 day increases with an increase of water glass content.
JIA Yi1 LI Fuhai1,
2 WU Debao1 WANG Yongbao3
.Experimental Study on Mix Proportions of Synchronous Two-component Grouting for Shield Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(2): 143-515
2019, Vol. 56 