Application and evaluation of soil suction and moisture equipment for unsaturated soils

非饱和土吸土保湿设备的应用与评价

• 批准号: 331161-2006
• 负责人: Fredlund, Delwyn
• 金额: $ 1.49万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=325675
• 关键词: Application; evaluation; soil; suction; moisture

Soils in semi-arid regions such as Saskatchewan and near surface soils generally are unsaturated.  There is a great need for reliable and rapid measurement of water content and negative pore-water pressure in soils which is referred to as matric suction.  The measurement of matric suction can be used to: predict/monitor the stability of slopes; improve the design, performance and maintenance of highways subgrates; predict/monitor moisture movements through waste dumps, landfills and other contaminated sites, into the regional groundwater; and to design/monitor soil covers.  The annual costs associated with such problems in geotechnical, geo-environmental, and highway engineering, are estimated to be in the multi-million dollar range.   University of Saskatchewan has been a leader in research and development of matric suction measuring devices.  Given the public demand for stringent safety and environmental regulations, the need to reliably monitor slopes and industrial sites for contaminants has become urgent.    The proposal is to evaluate and use two new pieces of equipment in the areas of geotechnical and geo-environmental engineering.  The equipment is WP4-T Dew Point PotentiaMeter that measures suction rapidly and 6 ThetaProbes that measure water content in the field..  ThetaProbes will be installed in the field.  This equipment will be used for in both geotechnical and geo-environmental engineering research as and in particular in the study of unsaturated soil behaviour at low water contents and high suctions.   Graduate and undergraduate students and a research engineer will be trained in the use of this equipment.  Unsaturated soil mechanics is a relatively new area of study and the training will enhance the ability of our engineers to complete in a global market and promote innovations and research findings of Canada.

半干旱地区（如萨斯喀彻温省）的土壤和近地表土壤一般都是非饱和的，因此迫切需要可靠、快速地测量土壤中的含水量和负孔隙水压力（称为基质吸力），基质吸力的测量可用于：预测/监测边坡的稳定性，改进公路路基的设计、性能和维护，提高公路路基的安全性。预测/监测水分通过垃圾场、垃圾填埋场和其他污染场地进入区域地下水的运动;设计/监测土壤覆盖层。每年与岩土工程、地质环境和公路工程中的这些问题相关的费用估计在数百万美元的范围内。 萨斯喀彻温大学在基质吸力测量设备的研发方面一直处于领先地位。鉴于公众对严格的安全和环境法规的需求，对斜坡和工业场地污染物进行可靠监测的需求变得迫切。 建议在岩土工程和地质环境工程领域评估和使用两种新设备，即快速测量吸力的WP 4-T露点电位计和测量实地含水量的6 ThetaProbes。 ThetaProbes将被安装在现场，该设备将用于岩土工程和地质环境工程研究，特别是在低含水量和高吸力下的非饱和土壤行为研究。 研究生和本科生以及一名研究工程师将接受使用该设备的培训。非饱和土力学是一个相对较新的研究领域，培训将提高我们的工程师在全球市场上完成工作的能力，并促进加拿大的创新和研究成果。