Thermal-mechanical response of frozen clay soil and the impact on soil-structure interaction

冻粘土的热力响应及其对土-结构相互作用的影响

• 批准号: RGPIN-2017-05169
• 负责人: Li, Biao
• 金额: $ 1.46万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=636207
• 关键词: Thermal; mechanical; response; frozen; clay

In northern Canada, frozen clay soil is very abundant in permafrost regions, where new infrastructure needs are being created as a result of heightened demand for resources. Long term records indicate an on-going global warming has resulted in thawing of portions of the permafrost area, which leads to extensive settlement of the ground surface and causing damage to infrastructures. Understanding the behavior of frozen soil under thermal-mechanical impact is the fundamental of studying on the soil-structure interaction, which is of significant importance to the development of safe and economical designs of infrastructures in cold regions. Currently, very little theoretical work on thermally induced strength weakening in frozen clay soil can be found, and numerical simulation on the temperature-dependent failure behavior in frozen clay soil is not available. There remains a significant knowledge gap in terms of understanding the underlying mechanisms of thermally induced mechanical degradation (weakening) of frozen clay soil and how those affect the performance of infrastructures. Consequently, very few companies would like to take into account of thermally induced failure of frozen clay soil in their designs.

在加拿大北方的永久冻土区，冻土非常丰富，由于对资源的需求增加，正在创造新的基础设施需求。长期记录表明，持续的全球变暖导致部分永久冻土区融化，导致地表大面积沉降，并对基础设施造成破坏。了解冻土在热力冲击作用下的力学行为是研究土-结构相互作用的基础，对寒区基础设施的安全、经济设计具有重要意义。目前，对冻土强度弱化的理论研究还很少，对冻土破坏行为的数值模拟也不多见。在理解冻土热致机械退化（弱化）的基本机制以及这些机制如何影响基础设施的性能方面，仍然存在着重大的知识差距。因此，很少有公司愿意在设计中考虑冻结粘土的热致破坏。