A New Experimental Approach Toward a Unified Theory of Time-Dependent Consolidation

小行星9800318 “固结时间相关统一理论的一种新的实验方法” 这项研究涉及一种创新的实验方法， 帮助 解决了岩土工程中的一个基本问题：固结过程中随时间变化的蠕变变形的作用。 细粒土的原始固结理论不能预测 蠕变变形的影响，发生在恒定 有效的压力水平。 这 LED 重大的实际问题，包括难以预测 领域 固结沉降 基于 在实验室测试。 这也导致了对固结过程中蠕变性质的研究和辩论。 一个假设预测蠕变变形的影响，直到所有的荷载引起的孔隙水压力消散后，另一个假设包括整个固结过程中的蠕变。 那里 是 大量的数据和著名的研究人员支持这两种理论，但他们之间的协议很少。 这 研究 将调查 有效性 的 一个整合模型，可以潜在地统一这两个假设，并解释两组明显矛盾的数据。 这项研究的目的不是为了证明其中一个假设，而是为了测量每个固结分量（由于孔隙压力消散和蠕变）对整体行为的贡献。 这项研究将通过东北大学和马萨诸塞州大学-阿默斯特分校的合作进行。 马萨诸塞大学-阿默斯特合作伙伴将获得四种天然土壤的高质量块体样品，每种土壤都有其特定的结构，并将进行短期和长期的常规，增量加载试验，以评估蠕变行为和常规固结参数。 在 东北部， 一 计算机自动化， 在先前的NSF奖励下，开发了一种专门的固结单元。 该设备将用于执行受控梯度测试，并通过中间试样孔隙压力探头提供反馈。 ***

9800318 Sheahan "A New Experimental Approach Toward a Unified Theory of Time- Dependent Consolidation" This research involves an innovative experimental approach to help resolve a fundamental issue in geotechnical engineering: the role of time-dependent creep deformations during consolidation. The original consolidation theory for fine-grained soils cannot predict the influence of creep deformations that occur under constant effective stress levels. This has led to significant practical problems, including difficulty in predicting field consolidation settlements based on laboratory tests. It has also led to research and debate on the nature of creep during consolidation. One hypothesis predicts no influence of creep deformations until after all loading-induced pore water pressures are dissipated; the other hypothesis includes creep throughout the consolidation process. There are substantial data and prominent researchers supporting each of the two theories, but little agreement between them. This research will investigate the validity of a consolidation model that can potentially unify the two hypotheses and explain both sets of apparently conflicting data. This research is not aimed at proving one of the hypotheses, but toward measuring the contribution of each consolidation component (due to pore pressure dissipation and due to creep) to the overall behavior. The research will be executed through a partnership between Northeastern University and the University of Massachusetts- Amherst. The UMASS- Amherst partner will obtain high quality block samples of four natural soils, each with its own particular structure, and will perform short- and long- term conventional, incrementally loaded tests to evaluate creep behavior and conventional consolidation parameters. At Northeastern, a computer-automated, specially inst rumented consolidation cell was developed under a prior NSF award. This device will be used to perform controlled gradient tests with feedback provided by mid-specimen pore pressure probes. ***