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Influence of excess pore pressures on the stability of the tunnel face

机译：孔隙压力过大对隧道工作面稳定性的影响

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In shield tunnelling in loose and water bearing soils, a bentonite slurry is often used to help support the tunnel face. During excavation, the bentonite cake, which is intended to seal the face, is removed by the cutter bits and subsequently slurry will infiltrate the soil. This infiltration causes excess pore pressures in front of the TBM, which lower the stability of the face. The effect has been investigated using a stationary model as well as with a time-dependent groundwater flow model, linked to a limit equilibrium face stability model. This model can be used to predict the minimal required support pressure and also the build-up of excess pore pressures in front of the TBM over time. The calculated excess pore pressures compare well with field observations.
机译：在松散且含水的土壤中进行盾构施工时，通常使用膨润土泥浆来帮助支撑隧道工作面。在开挖过程中，旨在密封工作面的膨润土饼被切刀去除，随后泥浆会渗入土壤。这种渗透会导致TBM前面的孔隙压力过大，从而降低面部的稳定性。使用固定模型以及与时间相关的地下水流动模型（与极限平衡面稳定性模型相关联）研究了这种影响。该模型可用于预测所需的最小支撑压力，以及随时间推移在TBM前方累积的多余孔隙压力。计算出的过高孔隙压力与现场观测结果相吻合。

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