复合地层盾构施工中泡沫对刀盘扭矩的影响分析及参数优化

Analysis of Influence of Foam on Cutterhead Torque of Shield Boring in Composite Strata and Its Parameter Optimization

在盾构施工过程中通常添加泡沫进行土体改良,土体的改良效果会直接影响盾构的掘进性能,而且对维持开挖面的稳定、提高掘进效率、减小刀具磨损具有至关重要的作用。依托穗莞深城际轨道交通虎门商贸城站到长安厦边站盾构区间工程,利用正交试验的方法对复合地层盾构掘进过程中土体改良效果进行研究,建立复合地层盾构施工中刀盘扭矩与其他掘进参数的数学模型,并对泡沫对刀盘扭矩的影响进行分析与参数优化。结果表明:当添加泡沫溶液量为0.01 m^3、泡沫体积分数为7%时,刀盘扭矩达到最优值2 033.1 kN·m。

The foam is usually used to carry out ground conditioning.The ground conditioning will affect shield boring performance directly,and it is the key to tunnel face stability,shield boring efficiency and wear of cutting tools.The ground conditioning effect of shield boring in composite strata of Humen Shangmaocheng Station-Chang’an Xiabian Station on Guangzhou-Dongguan-Shenzhen intercity railway is studied.The numerical models for cutterhead torque and boring parameters of shield boring in composite strata are established.The influence of foam on cutterhead torque is analyzed;and then the boring parameters are optimized.The analytical results show that the cutterhead torque can reach the optimal value （2 033.1 kN·m）when the volume of foam reaches 0.01 m3 and the volume fraction of foam reaches 7%.