Permeability Measurements from Routine On-the-fly CPT Sounding: Validation Against High-Quality Vis-CPT and In Situ Permeability Measurements

常规动态 CPT 测深的渗透率测量：针对高质量 Vis-CPT 和原位渗透率测量的验证

• 批准号: 0409002
• 负责人: Derek Elsworth
• 金额: --
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-15 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0409002&HistoricalAwards=false
• 关键词: Permeability; Measurements; Routine; fly; CPT

Cone penetrometer testing (CPT) is a valuable tool for the rapid and continuous profiling of strength, deformability, density, stress-state, and cyclic mobility of soils. Despite the continuous refinement of cone-measured metrics for the determination of these soil parameters, no comparably validated method exists to determine continuous profiles of in situ permeability. This is especially prescient given the needs of the environmental services industry for the rapid and precise reconstruction of permeability fields for the design of contaminant containment and remediation systems. This project will evaluate the potential to determine in situ permeability profiles directly from routinely measured cone sounding metrics recorded on-the-fly. Prospective correlations between in situ field-scale permeabilities and penetration-induced pore pressures, cone end-bearing, and sleeve-friction will be developed and verified against high-quality field data, to be gathered in this study. Specifically, we will:Fabricate in situ cone-deployable permeameters that examine the effects of penetrometer-induced disturbance on measured permeability magnitudes. Deploy these permeameters concurrently with the visual-CPT to gather unique ensemble data that link CPT sounding metrics with co-located measured permeabilities and visually observed fine-scale soil texture. Measure permeability magnitudes at unusually high spatial resolution and correlate these with direct visual observations of soil texture derived from the visual-CPT. Apply the ensemble data to establish correlations between on-the-fly CPT sounding metrics and permeabilities. And, Develop and refine models for mechanical and fluid transport behavior in the tip process zone that honor observed data in situ, and explain observed correlations.CPT soundings, co-located with independent in situ measurements of permeability are meager. This study will add to these data, apply unusual constraint to permeability measurements through incremental permeability testing and visual identification of soil texture via the visual-CPT, and develop and explore CPT-permeability correlations through the directed use of model development and dimensional analysis. This work addresses an unresolved problem - that of rapidly determining in situ permeability profiles. Uniquely, this study hypothesizes, and provides preliminary evaluations, for the rigorous use of CPT sounding data to determine permeability profiles. The fidelity of these prospective relationships will be explored and refined using unusually well-constrained in situ measurements. If affirmed, these proposed correlations will enable rapid and continuous profiling of soil permeabilities using standard cone metrics, that is currently not possible. Permeability profiles may subsequently be evaluated a posteriori from the wealth of piezocone data available, worldwide. Combined with the in situ visual identification of porosities and texture, and direct measurements of contaminant concentrations and fluid saturations, these ensemble techniques will provide an important tool to determine rates of migration of free-phase and aqueous components in unconsolidated porous media at spatial scales of relevance. This study will involve the training of graduate students and the findings will be disseminated in classes, presentations, and through publications.

静力触探试验是一种快速、连续测定土的强度、变形性、密度、应力状态和循环流动性的有效工具。 尽管不断完善锥测量的指标，这些土壤参数的测定，没有经过验证的方法存在，以确定连续的剖面原位渗透性。 考虑到环境服务行业需要快速和精确地重建渗透性场，以设计污染物控制和补救系统，这一点尤其具有先见之明。 该项目将评估直接从实时记录的常规测量的锥形测深指标确定原位渗透率剖面的可能性。 将根据本研究中收集的高质量现场数据，开发并验证现场规模渗透率与渗透引起的孔隙压力、锥体端部轴承和套筒摩擦之间的前瞻性相关性。具体来说，我们将：制造在原位锥展开渗透仪，检查的影响，渗透仪引起的干扰测量渗透率的大小。 与可视化CPT同时部署这些渗透仪，以收集独特的集合数据，将CPT探测指标与同位测量的渗透率和可视化观察的细尺度土壤质地联系起来。 测量渗透率的幅度在异常高的空间分辨率和相关的直接视觉观察土壤质地来自视觉CPT。应用集合数据建立飞行中CPT探测指标和渗透率之间的相关性。 而且， 开发和完善尖端工艺区的机械和流体输运行为模型，以荣誉现场观测数据，并解释观测到的相关性。与渗透率的独立现场测量一起定位的CPT探测是微不足道的。 本研究将添加到这些数据中，通过增量渗透率测试和通过可视化CPT对土壤质地的视觉识别对渗透率测量施加不寻常的约束，并通过直接使用模型开发和量纲分析来开发和探索CPT渗透率相关性。 这项工作解决了一个悬而未决的问题-即快速确定原位渗透率剖面。 独特的是，这项研究假设，并提供了初步评估，严格使用CPT测深数据，以确定渗透率剖面。 这些前瞻性的关系的保真度将进行探索和改进，使用异常良好的约束原位测量。如果得到确认，这些拟议的相关性将使快速和连续的土壤渗透性分析使用标准锥度量，这是目前不可能的。 渗透率剖面随后可以从世界范围内可用的大量压锥数据中进行后验评估。 结合现场的孔隙度和纹理的视觉识别，污染物浓度和流体饱和度的直接测量，这些合奏技术将提供一个重要的工具，以确定在空间尺度的相关性在松散的多孔介质中的自由相和含水组分的迁移率。 这项研究将涉及对研究生的培训，研究结果将在课堂上、演讲中和通过出版物传播。