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隧道掘进机(TBM)近年来在世界范围内得到了广泛应用,通常通过完全充满压力仓的泥土或泥浆来支护开挖面。但在较差的地层和水力条件下,开挖面失稳时有发生。事实上,TBM开挖面的支护压力的大小直接决定了施工安全及地表变形。基于所建立的开挖面支护压力计算模型,并考虑复合地层下土体分层带来的影响,通过计算机编程方法,建立了界面友好、使用便捷的开挖面支护压力可视化计算平台(TBM Studio);并结合阿拉斯加隧道、钱江隧道工程实例进行了不同模型结果的验证分析,给出了各模型计算结果的差异性;讨论了软土复合地层条件下,土体自稳性对开挖面稳定的影响,认为软土地层中定量确定有效支护压力和水头高度至关重要,研究为正确评价TBM开挖面稳定性提供了相应的计算模型。
Tunnel boring machine (TBM) has been widely used in the world in recent years, usually by completely filling the pressure of the soil or mud to support excavation face. However, in poor strata and hydraulic conditions, excavation surface instability occurs from time to time. In fact, the size of the supporting pressure on the excavation face of TBM directly determines the construction safety and surface deformation. Based on the established pressure calculation model for excavation face support pressure and considering the influence of soil stratification under compound formation, a visualized calculation platform of pressure and pressure for excavation face support is established through computer programming TBM Studio). The verification and analysis of different model results based on the Alaska tunnel and Qianjiang tunnel project are given. The differences of calculation results of each model are given. The effects of soil self-stability on the open It is considered that it is very important to quantitatively determine the effective supporting pressure and head height in soft ground strata. The study provides a corresponding calculation model for the correct evaluation of TBM face excavation surface stability.