Mechanical behaviour of natural silts for geotechnical earthquake engineering practice

岩土地震工程实践中天然粉土的力学行为

• 批准号: 249603-2012
• 负责人: Wijewickreme, Dharmapriya
• 金额: $ 2.48万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=570657
• 关键词: Mechanical; behaviour; natural; silts; geotechnical

Liquefaction of soil has caused severe damage to buildings and lifelines during past earthquakes, and in turn, has led to loss of life and disruptions to living and working conditions of citizens. The Greater Vancouver Region of British Columbia (BC), Canada, is located in a zone of high seismicity, and it has been estimated that damage costs from a major earthquake in Vancouver could be over $30B with much of it associated with soil liquefaction. Much of the research focus so far has been on the liquefaction of sands since liquefaction has been observed predominantly in loose saturated sands. Recent earthquake experience suggests that liquefaction of natural silts is also a concern; it is also known that densification of silt to mitigate liquefaction is more expensive than the methods required for sands. Currently, there is no robust method to assess the liquefaction potential of natural silts primarily due to the lack of knowledge on silt behaviour. Hence, it is required to advance the fundamental knowledge on the mechanics of natural silts under seismic shaking; databases on silt response developed through systematic laboratory research are critical in this regard. Using Discovery Grant funds over the past six years, the applicant's research has led to initial findings on the silt behaviour and input for development of design guidelines. In the next five years, comprehensive experimental work on this subject involving four main research themes is proposed using the state-of-the-art facilities at the University of BC. The objective is to investigate the effects of the dominant physical factors on the liquefaction mechanisms of silts and develop engineering practice methods to assess liquefaction potential of silts using in situ testing. Three MASc and four PhD students will be trained during this work, thus adding to the earthquake geotechnical engineering expertise in Canada. The research findings will bridge the knowledge gaps on the behaviour of natural silts, and develop novel design methods with particular applicability to seismic design in civil and mining engineering fields.

在过去的地震中，土壤液化对建筑物和生命线造成了严重破坏，反过来又导致了生命损失，破坏了公民的生活和工作条件。加拿大不列颠哥伦比亚省（BC）的大温哥华地区位于高地震活动区，据估计，温哥华发生大地震造成的损失可能超过300亿美元，其中大部分与土壤液化有关。由于液化主要发生在松散的饱和砂土中，因此，迄今为止的研究重点主要集中在砂土的液化上。最近的地震经验表明，天然粉土的液化也是一个问题;人们也知道，压实粉土以减轻液化比砂所需的方法更昂贵。 目前，没有可靠的方法来评估天然粉土的液化潜力，主要是由于缺乏对粉土行为的了解。因此，需要推进地震震动下天然粉土力学的基础知识;通过系统的实验室研究开发的粉土响应数据库在这方面至关重要。在过去六年中，申请人利用发现补助金的资金进行研究，得出了关于淤泥行为的初步结果，并为制定设计准则提供了投入。 在接下来的五年里，关于这个问题的综合实验工作涉及四个主要研究主题，建议使用BC大学最先进的设施。 目的是研究主导物理因素对粉土液化机理的影响，并开发利用原位试验评估粉土液化潜力的工程实践方法。 在这项工作期间，将培训三名硕士和四名博士生，从而增加加拿大的地震岩土工程专业知识。研究结果将弥合天然粉土特性的知识差距，并开发新的设计方法，特别适用于土木和采矿工程领域的抗震设计。