Influence of gassy soils and gas hydrates on submarine slope failure

含气土壤和天然气水合物对海底边坡破坏的影响

• 批准号: 238267-2006
• 负责人: Grozic, Jocelyn
• 金额: $ 1.7万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=363645
• 关键词: Influence; gassy; soils; gas; hydrates

Offshore geohazards impact the economic development and safe operation of marine infrastructure.  Landslides occurring on the ocean floor are a common geohazard that have considerable potential for damage and loss of life; yet, the triggering and evolution of submarine slides is not well understood.  This is particularly true when examining the effects of gas in soils.  Gas, in bubble or hydrate form, has been circumstantially and theoretically linked to many submarine slope failures.  However, it remains a major challenge to integrate the role of gas into the quantitative analysis and prediction of submarine slope failures. This research is aimed at obtaining an integrated understanding of the significance of gas in marine soils using a combined experimental and theoretical approach.  Experimental studies will investigate the fundamental behaviour of soil containing gas and gas hydrates using customized geotechnical testing equipment located in two new facilities at the University of Calgary.  Constitutive models, verified with the results of the laboratory program, will be developed to describe the theoretical behavioural changes of the soil during hydrate dissociation and gassy soil unloading.  The constitutive models will then be incorporated into stability assessments to quantitatively analyze the stability of submarine slopes.  Finally, the results from all phases will be synthesized to develop recommendations regarding submarine slope stability, with particular emphasis on the governing parameters such as gas content, hydrate content, soil conditions, topography, and oceanographic data.  These recommendations will ultimately result in the development of guidelines that will enable the risk of damage to existing infrastructure and coastal developments to be evaluated and facilitate safer and more cost-effective designs of future offshore developments.  As the search for resources takes us into deeper water, remote regions, and unfamiliar territory, and the expanding global population continues increasing pressure to already burgeoning coastal areas, improved knowledge of the seabed conditions is of critical importance.

近海地质灾害影响经济发展和海洋基础设施的安全运行，洋底滑坡是一种常见的地质灾害，有相当大的破坏和生命损失的可能性;然而，人们对海底滑坡的触发和演变还没有很好的了解。2在研究土壤中气体的影响时，情况尤其如此。3气体，以气泡或水合物的形式，然而，将气体的作用纳入海底边坡失稳的定量分析和预测中仍然是一个重大的挑战。本研究旨在通过实验和理论相结合的方法，全面了解海洋土壤中气体的重要性。实验研究将使用位于卡尔加里大学两个新设施中的定制土工测试设备，调查含有气体和气体水合物的土壤的基本行为。本构模型，经实验室程序的结果验证，，以描述土壤在水合物分解和含气土壤卸载过程中的理论行为变化。然后，将本构模型纳入稳定性评估中，以定量分析海底边坡的稳定性。最后，将综合所有阶段的结果，以制定有关海底边坡稳定性的建议，特别强调控制参数，例如气体含量、水合物含量、土壤条件、地形，这些建议最终将导致制定准则，使现有基础设施和沿海发展受到损害的风险得到评估，并促进更安全和更经济的随着对资源的探索将我们带到更深的水域、偏远地区和陌生的领域，以及不断增长的全球人口继续增加对已经迅速发展的沿海地区的压力，提高对海底条件的了解至关重要。