On geotechnical properties of a lime-stabilized soft clay soil in Northern Quebec under freeze-thaw conditions

冻融条件下魁北克北部石灰稳定软粘土的岩土特性

• 批准号: 541431-2019
• 负责人: Li, Biao
• 金额: $ 1.82万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680978
• 关键词: geotechnical; properties; lime; stabilized; soft

Infrastructure development in the growing community of Waskaganish, Quebec has produced an excess quantity of excavated clay. As Waskaganish continues to develop, the issue of clay accumulation and its management is expected to remain for at least the next 20 years. Our collaboration industry partner BluMetric Environmental Inc. is proposing a sustainable value-added strategy that reinforce the soft clay structure using lime-stabilized approach to form a processed granular material suitable for civil and infrastructure work (no need to excavate/stockpile the clay). In warm countries, lime stabilization is used without problems; but in cold regions like Waskaganish, Quebec, some concerns are still present in relation to behavior of lime-stabilized soils at low temperatures, particularly in conditions of freezing and thawing. In this research project, we plan to conduct laboratory tests on lime-stabilized soft clay soils retrieved from Waskaganish area, Northern Quebec to study the impact of freeze and thaw cycles on geotechnical properties of lime-stabilized soils with different lime/clay ratios. The success completion of this project will directly provide a guidance on the optimum lime/clay ratio determination for BluMetric's project at Waskaganish. If the tests are conclusive, the lime treatment of clay could reduce the use of granular resources which are limited in this region of Quebec and reduce the adverse environmental effects of stockpiling clay.

魁北克的瓦斯卡加尼什社区不断发展，基础设施的发展产生了过量的挖掘粘土。随着瓦斯卡加尼什的继续发展，粘土积累及其管理的问题预计至少在今后20年内仍将存在。我们的合作行业合作伙伴BluMetric Environmental Inc.正在提出一种可持续的增值策略，即使用石灰稳定方法加固软粘土结构，形成适合土木和基础设施工程的加工颗粒材料（无需挖掘/储存粘土）。在温暖的国家，使用石灰稳定没有问题;但在寒冷的地区，如瓦斯卡加尼什，魁北克，仍然存在一些问题，与石灰稳定土在低温下的行为有关，特别是在冻结和融化的条件下。在本研究项目中，我们计划进行石灰稳定的软粘土从北方魁北克的瓦斯卡加尼什地区恢复的室内试验，研究冻融循环对石灰稳定土的岩土工程性质的影响与不同的石灰/粘土比。该项目的成功完成将直接为BluMetric在瓦斯卡加尼什的项目最佳石灰/粘土比的确定提供指导。如果试验是确定的，粘土的石灰处理可以减少魁北克这一地区有限的颗粒资源的使用，并减少储存粘土对环境的不利影响。