Defining the operational strength of peat (muskeg)

定义泥炭(muskeg)的操作强度

基本信息

  • 批准号:
    RGPIN-2020-04419
  • 负责人:
  • 金额:
    $ 3.13万
  • 依托单位:
  • 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

项目摘要

Muskeg and peat soils cover 18% of Canada's landmass and is primarily concentrated within the northern regions. A strong understanding of the engineering properties of muskeg is important for the construction and maintenance of transportation infrastructure in these regions. Defining the strength of highly fibrous peats is still elusive, as peat linearly strain harden and thus does not develop a maximum value that can be defined as a strength. Further, traditional geotechnical testing methods used to evaluate peat cannot evaluate tensile stresses generated by the fibrous structure. My research and a review of others' led to the hypotheses that highly fibrous peat, inclusive of the full effects of fiber reinforcement, fails at a tensile stress state; testing at this stress state can be accomplished with triaxial tests with extension stress paths; and the strength of this type of peat is poorly defined by a Mohr-Coloumb surface. Thus, Objective i is to quantify the tensile stresses generated within fibrous peat and fiber reinforced soils; specifically, how tension in fibers are incorporated into strength and manifest in the mechanism of failure. This research will evaluate the effects of fibers in peat and fiber reinforced clays, and then develop an understanding of how this tensile behaviour of fibrous soils manifests for bearing capacity. My past PhD student and I observed the seasonal increase of pore pressure (u) in peat beneath railway embankments well above hydrostatic pressure followed by a rapid decrease. This was found to be the result of gas generation and is controlled by temperature. The presence of gas and increased pore pressure was found to push fluid flow as a thermally driven consolidation mechanism and reduce effective strength. This led to the hypothesis that the estimated increases of mean temperature from 1.4oC to > 4oC for northern Alberta over the next 30 years will result in longer periods of accelerated degradation and thermally driven consolidation and that this sensitivity to temperature has the potential to negatively impact northern infrastructure. Thus, Objective ii is to evaluate the regional susceptibility of peat to gas generation and thus thermally driven consolidation and reduced strength; and to quantify the sensitivity of the rate of gas generation to increased temperatures that have been observed and predicted for these regions. Three sites in different regions of Canada will be instrumented to measure u resulting from gas generation at the start of the research program. The data and thermal modeling will determine the temperature profiles resulting from the differing climate change scenarios and evaluate the potential for increased degradation and associated gas generation. This study will further develop a fundamental understanding of the properties of muskeg and peaty soils, and thus impact the development in northern regions and the safety and reliability of Canada's infrastructure.
马斯基土壤和泥炭土覆盖了加拿大陆地面积的18%,主要集中在北部地区。深入了解麝香的工程特性对这些地区交通基础设施的建设和维护非常重要。

项目成果

期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)

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Hendry, Michael其他文献

Nerve Cross-Bridging to Enhance Nerve Regeneration in a Rat Model of Delayed Nerve Repair
  • DOI:
    10.1371/journal.pone.0127397
  • 发表时间:
    2015-05-27
  • 期刊:
  • 影响因子:
    3.7
  • 作者:
    Gordon, Tessa;Hendry, Michael;Borschel, Gregory H.
  • 通讯作者:
    Borschel, Gregory H.
Developing an early warning system for a very slow landslide based on displacement monitoring
  • DOI:
    10.1007/s11069-015-2110-2
  • 发表时间:
    2016-03-01
  • 期刊:
  • 影响因子:
    3.7
  • 作者:
    Macciotta, Renato;Hendry, Michael;Martin, C. Derek
  • 通讯作者:
    Martin, C. Derek

Hendry, Michael的其他文献

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{{ truncateString('Hendry, Michael', 18)}}的其他基金

Defining the operational strength of peat (muskeg)
定义泥炭(muskeg)的操作强度
  • 批准号:
    RGPIN-2020-04419
  • 财政年份:
    2022
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Discovery Grants Program - Individual
The pore pressure behaviour of argillaceous formations subjected to induced shear
诱导剪切作用下泥质地层的孔隙压力行为
  • 批准号:
    554460-2020
  • 财政年份:
    2021
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Alliance Grants
Defining the operational strength of peat (muskeg)
定义泥炭(muskeg)的操作强度
  • 批准号:
    RGPIN-2020-04419
  • 财政年份:
    2021
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Discovery Grants Program - Individual
Risk assessment of ground hazards along railways - Phase IV
铁路沿线地面灾害风险评估——第四阶段
  • 批准号:
    549684-2019
  • 财政年份:
    2021
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Alliance Grants
NSERC Industrial Research Chair in Railway Engineering
NSERC 铁路工程工业研究主席
  • 批准号:
    544435-2018
  • 财政年份:
    2021
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Industrial Research Chairs
Risk assessment of ground hazards along railways - Phase IV
铁路沿线地面灾害风险评估——第四阶段
  • 批准号:
    549684-2019
  • 财政年份:
    2020
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Alliance Grants
NSERC Industrial Research Chair in Railway Engineering
NSERC 铁路工程工业研究主席
  • 批准号:
    544435-2018
  • 财政年份:
    2020
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Industrial Research Chairs
Optical Fiber System for Measuring Pore Pressures during Progressive Failure
用于测量渐进破坏过程中孔隙压力的光纤系统
  • 批准号:
    RTI-2020-00129
  • 财政年份:
    2020
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Research Tools and Instruments
NSERC Industrial Research Chair in Railway Engineering
NSERC 铁路工程工业研究主席
  • 批准号:
    544435-2018
  • 财政年份:
    2019
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Industrial Research Chairs
Geomechanical Properties of Muskeg (Peat)
马斯基格(泥炭)的地质力学特性
  • 批准号:
    RGPIN-2014-04336
  • 财政年份:
    2019
  • 资助金额:
    $ 3.13万
  • 项目类别:
    Discovery Grants Program - Individual

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