Investigation of freeze/thaw action on earthen structures

土结构冻融作用的研究

• 批准号: 1885819
• 金额: --
• 依托单位: Heriot-Watt University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2016
• 资助国家: 英国
• 起止时间: 2016 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1885819
• 关键词: Investigation; freeze; thaw; action; earthen

The need for constructed facilities in the cold regions of the world has greatly increased interest relative to freeze/thaw action on earthen materials behaviour in geotechnical engineering practice. The large increase in soil strength on freezing has been utilised by engineers in construction of frozen earth structures. The ice becomes a bonding agent, fusing together adjacent soil particles to increase their combined strength and make them impermeable to water seepage. Contrarily, when the temperature is increased to above 0oC, the process of thaw is initiated and the apparent increased strength and bonding is gradually lost. In the practice, earthen structures can be subjected to consecutive cycles of freezing/thawing that may alter the materials performance. This project aims to experimentally investigate the effect of temporal freeze/thaw action on earthen materials behaviour. Cycled soil water retention behaviour of the material will be scrutinised utilising pressure plate apparatus combined with electrical resistivity method. In parallel, it will be developed a methodology to investigate freezing and thawing using the electrical resistivity of the material.

在世界寒冷地区建造设施的需要大大增加了人们对岩土工程实践中土材料行为的冻融作用的兴趣。冻结时土壤强度的大幅增加已被工程师用于冻土结构的建设。冰变成了粘合剂，将相邻的土壤颗粒融合在一起，以增加它们的结合强度，使它们不渗水。相反，当温度升高到0 ℃以上时，解冻过程开始，表观增加的强度和粘合逐渐丧失。在实践中，土结构可能会经历连续的冻融循环，这可能会改变材料的性能。本计画旨在以实验方式探讨暂时冻融作用对土质材料行为之影响。将利用压力板装置结合电阻率法来检查材料的循环土壤持水性能。与此同时，还将开发一种方法，利用材料的电阻率来研究冻结和解冻。