Deep mixing to stabilize champlain sea clay

这项拟议的研究是将NSERC参与的一个成功的研究项目扩展到应用深度混合方法（DMM）对敏感的尚普兰海粘土的地基改善进行彻底的研究。渥太华地区和上圣劳伦斯河地区周边的基础设施发展对加拿大经济至关重要；然而，当地的海洋粘土被称为尚普兰海粘土，由于其敏感的性质，使建筑活动变得困难。尚普兰海的粘土也造成了该地区的许多山体滑坡。因此，迫切需要一种新的地面改善方法，以实现安全、经济的基础设施建设。DMM是一种地面改善技术，将水泥或石灰等粘合剂原位混合到土壤中，以改善其性能并使施工可行。自20世纪70年代开始，DMM在包括加拿大西部在内的世界许多地方都非常流行。然而，由于缺乏测试数据，DMM尚未在加拿大东部应用。在之前的NSERC Engage项目中，用水泥稳定Champlain Sea粘土的效率得到了证实，强度显著提高，压缩率显著降低。本研究的目的是：(1)获得合适的粘结剂和最佳用量，并深入研究尚普兰海稳定粘土的岩土性能；2)测试DMM稳定尚普兰海粘土的长期性能；3)制定了严格的设计方法。DMM的引入可以为加拿大东部的基础设施发展带来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.