Deep mixing to stabilize champlain sea clay

这项研究是为了将NSERC Engage成功的研究项目扩展到应用深层搅拌法(DMM)对敏感的尚普兰海粘土进行地基加固的深入研究。渥太华地区和圣劳伦斯河上游地区周围的基础设施发展对加拿大经济非常重要；然而，当地被称为尚普兰海粘土的海洋粘土由于其敏感性质而使建筑活动变得困难。尚普兰海泥也是该地区许多山体滑坡的罪魁祸首。因此，迫切需要一种新的地基处理方法来安全、经济地发展基础设施。DMM是一种地基改良技术，将水泥或石灰等粘结剂就地掺入土壤中，以改善土壤的性能，使建筑可行。自20世纪70年代创立以来，DMM在世界许多地区非常受欢迎，包括加拿大西部。然而，由于缺乏测试数据，DMM尚未在加拿大东部应用。在以前的NSERC Engage项目中，用水泥稳定尚普兰海粘土的效果得到了证实，强度显著提高，压缩性降低。本研究的目的是：1)获得合适的粘结剂和最佳掺量，并深入研究稳定的尚普兰海泥的岩土性质；2)测试DMM稳定的尚普兰海泥的长期性能；3)制定严格的设计方法。DMM的引入可能会对加拿大东部的基础设施发展产生重大的经济和社会效益。

This proposed research is to extend a successful NSERC Engage research project into a thorough investigation of applying the deep mixing method (DMM) for ground improvement of sensitive Champlain Sea clay. Infrastructure development around the Ottawa region and the Upper St. Lawrence River region is important for Canada's economy; however, the local marine clay known as Champlain Sea clay makes construction activity difficult due to its sensitive nature. Champlain Sea clay has also been responsible for many landslides in the area. Therefore, a novel ground improvement method is urgently required for safe and cost-efficient infrastructure development. DMM is a ground improvement technique where a binder such as cement or lime is mixed in-situ into the soil to improve its properties and make construction workable. Since its inception in the 1970s, DMM has become very popular in many parts of world, including Western Canada. However, DMM has yet to be applied in Eastern Canada due to a lack of test data. During a previous NSERC Engage project, the efficiency of stabilizing Champlain Sea clay with cement was confirmed with a significant strength increase and compressibility reduction. The objectives of this research are to 1) obtain the right binder and optimum dosage and thoroughly investigate the geotechnical properties of stabilized Champlain Sea clay; 2) test the long-term performance of DMM stabilized Champlain Sea clay; and 3) develop a rigorous design method. The introduction of DMM could have significant economic and social benefits for infrastructure development in Eastern Canada.