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Time-dependant infiltration and groundwater flow in a face stability analysis

机译:面稳定性分析中随时间变化的入渗量和地下水流量

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In slurry or EPB shields a bentonite slurry or a foam may be injected by the TBM into the soil. These injections will displace part of the pore water before the TBM and, especially in fine sands, will cause excess pore pressures in front of the TBM, which lower the effective stresses in the soil and thereby the stability of the tunnel face. These excess pore pressures increase during boring and dissipate during stand-stills. Using a time-dependant groundwater flow model this behaviour has been included in a limit equilibrium model, in order to predict the pore pressures measured in front of the TBM. The results have been compared to field measurements.
机译:在泥浆或EPB屏蔽中,膨润土泥浆或泡沫可通过TBM注入土壤中。这些注入将在TBM之前驱替部分孔隙水,尤其是在细砂中,将在TBM前面引起过大的孔隙压力,从而降低土壤中的有效应力,从而降低隧道面的稳定性。这些多余的孔隙压力在钻孔过程中会增加,在停顿过程中会消散。使用时间相关的地下水流模型,此行为已包含在极限平衡模型中,以便预测在TBM前面测得的孔隙压力。将结果与现场测量结果进行了比较。

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