Mechanical Behaviour of Artificially Frozen Ground: Experimental Observations and Modelling

人工冻土在建筑中的应用包括形成冻结土墙以支撑深挖，结构托换用于地基加固，以及地下水的临时控制。越来越多的人意识到人工冻土作为一种对环境影响最小的临时性地基改良系统的优点，这直接关系到对冻土力学行为的了解取得的进展。但是，对于冻土/未冻土的完全耦合的热-流体力学行为，还没有建立一个坚实的框架，还需要在实验特征和本构模型方面进行基础研究。拟议的项目将开发、设置和使用创新的实验室设备，以实验研究土壤在冻结和融化过程中的行为。该项目将利用土壤力学、热力学、土壤物理、材料科学和工业之间的多学科知识，对冻土的力学行为提供有价值的见解。然后，结果将被推广到校准本构模型，并验证关于人工冻土行为的现有假设。

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.