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Coupled Computational Simulation of Excavation and Soil Transport in Earth-Pressure Balance Shield Tunneling Machines using a viscous Two-Phase Fluid Model for Soil-Foam Mixtures

机译：用粘性两相流体模型进行土压平衡屏蔽隧道掘进机耦合计算仿真和土壤 - 压力平衡隧道掘进机土壤 - 泡沫混合物

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The excavation process of Earth-Pressure Balance (EPB) shield machines involves the cutting of the ground at the tunnel face and the transport of the soil paste in the excavation chamber. For the numerical simulation of these two processes, a computational strategy, characterized by the coupling of two partial models using the Discrete Element Method (DEM) and the Finite Element Method (FEM) has been developed (Wessels et al., 2013). Excavation is simulated using DEM, with the fracture process being represented by the release of interaction forces between the particles. The transport of the excavated soil mixed with the soil conditioning foam, yielding a pasty soil-foam mixture within the pressure chamber, is simulated by means of a two-phase fluid model in Eulerian description. The two momentum and mixture mass equations are discretized in time by the Characteristic Based Split method (CBS) (Zienkiewicz et al., 2005). The phase volume fraction equations are solved using upwind weighting functions according to the improved Mizukami-Hughes method (Knobloch, 2006). The proposed model is applied to a coupled analysis of the excavation and transport-mixing flow inside a simplified pressure chamber with foam injections. The mixing process due to the rotation in the chamber is preliminarily investigated by the mixing flow in a 2D cavity test case.

机译：接地压力平衡（EPB）屏蔽机的挖掘过程涉及在隧道面上切割地面，并在挖掘室中的土壤浆料的运输。对于这两个过程的数值模拟，计算策略，其特征在于，已经开发了使用离散元素方法（DEM）和有限元方法（FEM）的两个部分模型的耦合（Wessels等，2013）。使用DEM模拟挖掘，通过裂缝过程来表示颗粒之间的相互作用力。通过在欧拉描述中的两相流体模型模拟挖掘机与土壤调理泡沫混合的挖掘土壤的运输，从而在压力室内产生糊状的土壤 - 泡沫混合物。通过基于特征的分裂方法（CBS）（Zienkiewicz等，2005）在时间上随着时间的时间分离出两个动量和混合物质量方程。根据改进的Mizukami-Hughes方法（Knobloch，2006），使用Unwind加权函数求解相位体积分数方程。所提出的模型应用于具有泡沫喷射的简化压力室内的挖掘和运输混合流的耦合分析。由腔室中的旋转引起的混合过程预先通过2D腔测试壳体中的混合流程来研究。

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《Geoshanghai international congress》|2014年||共10页
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Thai Son Dang; Guenther Meschke; Nicola Wessels; Klaus Hackl;
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中图分类土力学;
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机译：土压平衡盾构机中土方开挖和运移的耦合计算方法
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机译：剪切滑移网格更新-浸入边界有限元模型，用于EPB隧道掘进机中物料传输的计算模拟
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机译：土-泡沫混合料粘性两相流模型在土压平衡盾构掘进机中开挖与土壤运输耦合计算模拟
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机译：使用TEam代码评估通用战斗机风洞模型中良性和爆发涡流的计算模拟中的粘性效应

Coupled Computational Simulation of Excavation and Soil Transport in Earth-Pressure Balance Shield Tunneling Machines using a viscous Two-Phase Fluid Model for Soil-Foam Mixtures

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