Investigating engineering properties of cemented cohensive soils as foundation support

研究作为地基支撑的水泥土的工程特性

• 批准号: 493088-2015
• 负责人: Deng, Lijun
• 金额: $ 1.63万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=649004
• 关键词: Investigating; engineering; properties; cemented; cohensive

The rapid growth of the energy and construction industries of Western Canada has resulted in dramatic land use in dense urban regions. Areas and properties with poor soil conditions are inevitably encountered in many development projects. As a result, remedial solutions to overcome the difficult construction on poor-quality ground are critical. Deep soil mixing (DSM), which mixes the soil in situ with cementitious agents, has the advantages in the construction rate and cost. However, DSM has not been widely adopted by Canada's construction industry, perhaps due to concerns with the mechanical and hydraulic performance of DSM-treated soils in the areas where the cold-environment exposure is of concerns. Research on cemented cohesive soils subjected to Freeze-Thaw (f-t) cycles has been scarce. Consequently, fundamental engineering behaviour of cemented cohesive soils under f-t cycles has not been clearly understood and the DSM technique in cohesive soil sites of Canada has not been practically applied. The proposed program will investigate the mechanical and hydraulic behaviour of cemented cohesive soils (or soilcrete) without or with f-t exposure, and qualitatively characterize the microstructure changes in soilcrete specimens at various curing ages with f-t exposure. The proposal will be partnered with Keller Canada Ltd., which has been playing a major role in the practice and research of DSM technique. The proposed program consists of three tasks in three-year duration. We will train one PhD and two MSc students and conduct destructive or non-destructive tests. By investing in this project, the industrial partner will maintain the leadership in the ground improvement industry. The energy infrastructure and construction industry of Canada will benefit from the provision of a ground improvement technique that is suitable to the cold temperature.

加拿大西部能源和建筑工业的快速增长导致了密集城市地区的大量土地使用。在许多开发项目中，不可避免地会遇到土壤条件差的地区和物业。因此，克服在劣质土地上施工困难的补救办法至关重要。深层土搅拌是将土与胶凝剂原位混合，在施工速度和成本上具有优势。然而，DSM并没有被加拿大的建筑行业广泛采用，可能是由于对DSM处理过的土壤在寒冷环境暴露的地区的机械和水力性能的担忧。冻融循环作用下胶结粘性土的研究很少。因此，f-t循环作用下胶结粘性土的基本工程行为尚未得到清楚的认识，DSM技术在加拿大粘性土场地的实际应用也尚未实现。该计划将研究没有或有f-t暴露的胶结粘性土（或混凝土）的力学和水力行为，并定性地表征在不同养护年龄的土混凝土样品中f-t暴露的微观结构变化。该提案将与凯勒加拿大有限公司合作，该公司一直在DSM技术的实践和研究中发挥重要作用。该计划包括三个为期三年的任务。我们将培训一名博士和两名硕士学生，并进行破坏性或非破坏性测试。通过投资该项目，工业合作伙伴将保持在地面改善行业的领导地位。加拿大的能源基础设施和建筑业将受益于提供适合寒冷温度的地面改善技术。