Mechanical Behaviour of Artificially Frozen Ground: Experimental Observations and Modelling

人工冻结法在建筑工程中的应用包括形成冻土墙以支持深基坑、结构托换以改善地基以及临时控制地下水。人们越来越认识到人工冻结作为一种对环境影响最小的临时地基加固系统的优点，这与对冻土力学行为的理解的进展直接相关。然而，一个坚实的框架尚未建立完全耦合的热-流体力学行为的冷冻/因此，有必要对未冻土的实验特性和本构模型进行基础研究。拟议的项目将开发、建立和使用创新的实验室设备，以实验方式调查土壤在冻结和融化时的行为。该项目将提供有价值的深入了解冻土的mechanicalbehavior，在土壤力学，热力学，土壤物理学，材料科学和工业之间的接口的多学科知识借鉴。研究结果将用于标定本构模型和验证现有的人工冻土行为假设。

The applications of artificial ground freezing in construction cover the formation of frozen earth walls to support deepexcavations, structural underpinning for foundation improvement, and temporary control of ground water. The growingawareness of the merits of artificial ground freezing as a temporary ground improvement system with minimalenvironmental impact is directly related to progress in the understanding of the mechanical behaviour of frozen soils.However, a solid framework has yet to be established for the fully coupled thermo-hydromechanical behaviour offrozen/unfrozen soil and there is need for fundamental research to be carried out on experimental characterisation andconstitutive modelling. The proposed project will develop, set-up and use innovative laboratory equipment to investigateexperimentally the behaviour of soil on freezing and thawing. The project will provide valuable insight into the mechanicalbehaviour of frozen soils, drawing upon multi-disciplinary knowledge at the interface between soil mechanics,thermodynamics, soil physics, material science, and industry. The results will then be carried forward to calibrateconstitutive models and validate existing hypothesis on artificially frozen ground behaviour.