Collaborative Research: Efficacy and Durability of Microbially Induced Desaturation to Mitigate Liquefaction in Fine-grained Soils

合作研究:微生物诱导去饱和缓解细粒土壤液化的功效和持久性

基本信息

  • 批准号:
    2242227
  • 负责人:
  • 金额:
    $ 59.63万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2023
  • 资助国家:
    美国
  • 起止时间:
    2023-09-01 至 2026-08-31
  • 项目状态:
    未结题

项目摘要

Earthquake liquefaction is the severe loss of soil strength due to earthquake shaking in saturated soils, which can cause significant infrastructure damage from large ground deformations and bearing capacity loss. Major infrastructure in the US is on silt soils vulnerable to liquefaction, including many fuel tanks along the Columbia River in Portland, Oregon. However, there are few feasible methods to mitigate liquefaction of silt soils beneath infrastructure due to the high cost and, in many cases, the invasive nature of existing ground improvement methods. This award will examine the effectiveness and durability of microbially induced desaturation (MID) to mitigate liquefiable silt soils. MID injects into the ground a treatment solution that stimulates native denitrifying microbes. The primary product of the denitrification reaction is nitrogen gas, which reduces soil saturation. A small reduction in saturation is known to substantially increase liquefaction resistance in sands. However, the effectiveness and longevity of MID in silts remain as major unknowns. This research addresses these unknowns through laboratory experiments, field testing, and theoretical modeling. This award will also engage underrepresented students from an all-girls high school through research internships. The project seeks to understand fundamental soil-water-gas interactions to evaluate the potential for MID to mitigate liquefaction of fine-grained liquefiable materials. This research specifically aims to (i) examine changes to the cyclically induced excess pore water pressure due to MID to prevent liquefaction triggering, (ii) examine the persistence of biogas on time-scales relevant to civil infrastructure, and (iii) link spatial and temporal saturation changes in the field to the fundamental physics governing gas mobility and longevity. The effects of MID on liquefaction triggering will be examined through laboratory cyclic tests considering both changes in pore fluid compressibility and soil skeleton damage. Gas persistence will be investigated by examining the formation of gas in fine-grained soils through laboratory experiments, gas diffusion and redistribution in layered soils with bench-scale experiments, and the effects of groundwater flow in fine-grained stratified soils through a field-scale experiment. Theory-based gas transport models to examine soil resaturation will be developed and validated with the project dataset. This work will generate a rich data set and understanding of soil-water-gas interactions required to move MID from an abstract ground improvement method to one that can be assessed as a practicable long-term ground improvement method.This project is jointly funded by the Engineering for Civil, Mechanical and Manufacturing Innovation (CMMI) Division and the Established Program to Stimulate Competitive Research (EPSCoR).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
地震液化是由于饱和土壤中的地震震动而导致的土壤强度的严重损失,这可能会造成较大的地面变形和承受能力损失的重大基础设施损害。美国的主要基础设施是在容易受到液化的淤泥土壤上,其中包括俄勒冈州波特兰哥伦比亚河沿岸的许多燃油箱。但是,由于成本高,几乎没有可行的方法来减轻基础设施下方的淤泥土壤的液化,并且在许多情况下是现有地面改进方法的侵入性性质。该奖项将检查微生物诱导的去饱和度(中)的有效性和耐用性,以减轻液化粉砂土。中间注入地面的一种治疗溶液,可刺激天然反硝化微生物。反硝化反应的主要产物是氮气,可减少土壤饱和。众所周知,饱和度的少量减少可大大增加沙子中的液化性。然而,淤泥中中部的有效性和寿命仍然是主要未知数。这项研究通过实验室实验,现场测试和理论建模来解决这些未知数。该奖项还将通过研究实习来吸引来自全女孩高中的代表性不足的学生。该项目旨在了解基本的土壤 - 水 - 气体相互作用,以评估减少细粒液化材料液化的中期的潜力。这项研究专门旨在(i)检查由于中期而导致周期诱导的孔隙水压的变化,以防止液化触发,(ii)检查沼气对与民用基础设施相关的时间标准的持久性,以及(iii)链接的空间和时间饱和度变化,使田间对基本物理学的气体和longe coberity and longe and longe and longe and longe and longe vity。考虑到孔隙流体可压缩性和土壤骨架损伤的变化,将检查MID对液化触发的影响。通过实验室实验,通过台式实验进行分层土壤中的气体扩散和重新分布,通过检查细粒土壤中气体的形成,并通过底层尺度的实验来研究气体持久性,以及通过田间规模实验在细颗粒分层土壤中的地下水流动的影响。将使用项目数据集开发和验证基于理论的气体传输模型来检查土壤流水。这项工作将产生丰富的数据集,并了解中间从抽象的地面改进方法转变为可以评估为一种可行的长期地面改进方法的方法。该项目由公民,机械和制造创新工程(CMMI)(CMMI)的工程(CMMI)分区和既定的竞争性研究(EPSCOR)授予(EPSCOR)。通过使用基金会的智力优点和更广泛影响的评论标准进行评估。

项目成果

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Diane Moug其他文献

Diane Moug的其他文献

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{{ truncateString('Diane Moug', 18)}}的其他基金

CAREER: Advanced and Uncertainty-Informed Site Investigation
职业:高级和不确定性现场调查
  • 批准号:
    2340596
  • 财政年份:
    2024
  • 资助金额:
    $ 59.63万
  • 项目类别:
    Standard Grant
RAPID/Collaborative Research: Subsurface Characterization of Liquefaction Case Histories from the 2023 Kahramanmaras Earthquake Sequence
快速/协作研究:2023 年卡赫拉曼马拉斯地震序列液化案例历史的地下特征
  • 批准号:
    2338025
  • 财政年份:
    2023
  • 资助金额:
    $ 59.63万
  • 项目类别:
    Standard Grant
RAPID/Collaborative Research: Investigating the Liquefaction Susceptibility of Calcareous Sand in Hawaii with an Enhanced NHERI@UTexas Large Mobile Shaker
快速/协作研究:使用增强型 NHERI@UTexas 大型移动摇床研究夏威夷钙质砂的液化敏感性
  • 批准号:
    2317659
  • 财政年份:
    2023
  • 资助金额:
    $ 59.63万
  • 项目类别:
    Standard Grant
Investigation of Pore Pressure Migration During Piezocone Tests
压电锥测试过程中孔隙压力迁移的研究
  • 批准号:
    1927557
  • 财政年份:
    2019
  • 资助金额:
    $ 59.63万
  • 项目类别:
    Standard Grant

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Collaborative Research: Supporting Chemistry Students’ Science Practice Self-Efficacy
合作研究:支持化学学生的科学实践自我效能感
  • 批准号:
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  • 财政年份:
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    $ 59.63万
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Collaborative Research: Efficacy and Durability of Microbially Induced Desaturation to Mitigate Liquefaction in Fine-grained Soils
合作研究:微生物诱导去饱和缓解细粒土壤液化的功效和持久性
  • 批准号:
    2242228
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    Standard Grant
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