Soil Structure Interaction Analysis for Energy Foundations

能源基础的土壤结构相互作用分析

• 批准号: RGPIN-2020-04968
• 负责人: Basu, Dipanjan
• 金额: $ 1.89万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=717383
• 关键词: Soil; Structure; Interaction; Analysis; Energy

Increasing energy demands, dwindling fossil fuel reserves and a heightened concern for the detrimental effects of carbon emissions leading to climate change have made it necessary to search for alternate, renewable and clean energy sources. Wind and geothermal energies are clean and renewable energies that can be extracted economically by setting up offshore wind farms and by constructing structural foundations which serve the dual purpose of extracting geothermal energy from the ground and providing mechanical support to buildings and structures. Recent installations of offshore wind turbines (OWTs) in Europe and other parts of the world have led to a total power generation capacity of over 11,027 MW. OWTs are mostly founded on monopile foundations and can provide a continuous and steady supply of wind energy along the long coast lines of Canada. Monopile design requires improvement, particularly against cyclic loads, to improve the cost-effectiveness and reliability of the wind farms. It is estimated that the use of geothermal energy in residential and commercial buildings may lead to 45-80% reduction in CO2 emissions and to 18-56% cost savings. The extraction of geothermal energy through energy pile foundations is very viable in Canada, because the temperature at a few feet below the earth's surface remains stable within a narrow range of 20-35C. The main concern in using energy piles is the lack of a precise design method because of which the reliability of energy piles is not well established in the Canadian piling industry. The proposed research will address the current gaps in the design of monopile foundations and geothermal pile foundations by (1) developing constitutive models for marine deposits supporting offshore wind-turbine monopiles, (2) developing analytical and numerical frameworks to investigate the long-term performance of monopiles under cyclic loads, (3) extending the analysis to a probabilistic framework considering the random spatial heterogeneity of soil properties, (4) performing earthquake analysis of the wind-turbine monopiles, (5) investigating the thermo-mechanical behavior of soil and soil-concrete interface using laboratory tests for geothermal energy pile applications, (6) developing thermoplastic, non-isothermal soil constitutive models for soil, (7) developing a numerical framework to analyze energy piles under mechanical and thermal loads, (8) improving design methodologies of wind-turbine monopiles and geothermal piles based on the research, and (9) performing sustainability assessment of wind-turbine monopiles and geothermal energy piles. The proposed research program will establish a pioneering, rational framework for the analysis and design of monopiles and energy piles. As the profession will recognize the value of the research, the framework will be adopted in practice, which will contribute to the sustainable development of civil infrastructure in Canada with clean energy technologies.

能源需求的增加、化石燃料储备的减少以及对碳排放导致气候变化的有害影响的高度关注，使得寻找替代、可再生和清洁能源成为必要。风能和地热能是清洁的可再生能源，可以通过建立海上风电场和建造结构地基来经济地提取，该结构地基具有从地面提取地热能和为建筑物和结构提供机械支撑的双重目的。 最近在欧洲和世界其他地区安装的海上风力涡轮机 (OWT) 已使总发电量超过 11,027 兆瓦。 OWT大多建立在单桩基础上，可以沿加拿大长海岸线提供持续稳定的风能供应。单桩设计需要改进，特别是针对循环载荷，以提高风电场的成本效益和可靠性。 据估计，在住宅和商业建筑中使用地热能可减少 45-80% 的二氧化碳排放量，并节省 18-56% 的成本。通过能源堆地基提取地热能在加拿大非常可行，因为地表以下几英尺的温度保持稳定在 20-35C 的狭窄范围内。使用能源桩的主要问题是缺乏精确的设计方法，因此能源桩的可靠性在加拿大打桩行业尚未得到很好的证实。 拟议的研究将通过（1）开发支持海上风力涡轮机单桩的海洋沉积本构模型，（2）开发分析和数值框架来研究单桩在循环载荷下的长期性能，（3）将分析扩展到考虑土壤性质的随机空间异质性的概率框架，以解决单桩基础和地热桩基础设计中的当前差距。 (4) 对风力涡轮机单桩进行地震分析，(5) 使用地热能桩应用的实验室测试研究土壤和土壤-混凝土界面的热机械行为，(6) 开发土壤的热塑性、非等温土壤本构模型，(7) 开发一个数值框架来分析机械和热载荷下的能源桩，(8) 改进风力涡轮机的设计方法 基于研究的单桩和地热能桩，(9)对风力发电机单桩和地热能桩进行可持续性评估。 拟议的研究计划将为单桩和能量桩的分析和设计建立一个开创性的、合理的框架。随着业界认识到该研究的价值，该框架将在实践中得到采用，这将有助于加拿大民用基础设施的清洁能源技术可持续发展。