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Multiphase Modeling and Computational Simulation of Soil Freezing in the Context of Mechanized Tunneling

机械化隧道施工中土壤冻结的多相建模和计算模拟

基本信息

批准号：
46895324
负责人：
Professor Dr. Günther Meschke
金额：
--
依托单位：
Lehrstuhl für Statik und Dynamik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/46895324?language=en
关键词：
Multiphase Modeling Computational Simulation Soil

项目摘要

The aim of this project is to develop a multiphase model for ground freezing that covers all essential aspects of ground freezing applied during shield supported tunnel excavation. This includes the coo-ling process by means of installed freeze pipes, the freezing process of the groundwater with the corresponding effects on soil deformations and the tunnel advance in frozen ground conditions including the multiple interactions between the shield driving process with the frozen ground. In the first project phase, a multiphase soil model has been developed within the theory of thermo-poromechanics, which allows the description of the coupled thermo-hydro-mechanical behavior of porous materials subjected to freezing, taking into account the phase transition between water and ice and the formation of ice lenses in a thermo-dynamically consistent form. In the proposed second project phase, the focus of research will be laid upon the modeling of the mechanical and rheological properties of frozen soil. The developed simulation model can be used as a forecasting and optimization tool for the design and execution of artificial ground freezing in tunneling. It will also allow a deeper understanding of the interacting processes between the shield driving and the support structure composed of frozen soil, and detailed studies of the influences of selected parameters.

本项目的目的是开发一个多相模型，地面冻结，涵盖所有的基本方面，地面冻结盾构隧道开挖过程中的应用。这包括通过安装冻结管的冷却过程、地下水的冻结过程及其对土壤变形的相应影响以及冻土条件下的隧道推进，包括盾构掘进过程与冻土之间的多重相互作用。在项目的第一阶段，在热孔隙力学理论范围内开发了一个多相土壤模型，该模型可以描述受冻结影响的多孔材料的热-水-力学耦合行为，同时考虑到水和冰之间的相变以及以热力学一致形式形成的冰透镜。在拟议的第二个项目阶段，研究的重点将放在冻土的力学和流变特性的建模。所建立的模拟模型可作为隧道人工冻结设计和施工的预测和优化工具。它还将允许更深入地了解盾构掘进和冻土组成的支撑结构之间的相互作用过程，并详细研究所选参数的影响。