MRI: Acquisition of Cyclic Simple Shear Apparatus for the Evaluation of the Effects of Load Path on Energy-Based Pore Pressure Models

该合同将用于购买亚利桑那州滕佩GCTS测试系统公司生产的SSH-100简单剪切系统。 将对其进行补充和修改，使其能够进行土壤的循环三轴试验和共振柱试验，以及循环简单剪切试验。 循环剪切仪将是一项研究计划的核心，以评估基于能量的孔隙压力生成模型的负载路径的影响。 基于能量的孔隙压力生成模型可用于帮助工程师预测土体在地震期间的反应。 为了将基于能量的孔隙压力模型应用于特定土壤，通过在实验室测试中测试样本来确定土壤特定参数，最常见的是循环三轴测试。 这些参数使模型能够将加载过程中试样中产生的孔隙压力与土壤中耗散的剪切能联系起来。 基于能量的模型的用户面临的问题是，所开发的模型是否仅对用于开发它的负载条件有效（即，所用试验施加的载荷路径），或者它与所用载荷条件无关，仅取决于耗散的能量。 私家侦探？的研究将使用SSH-100简单剪切系统，以量化和澄清的影响，负荷路径后，孔隙压力产生的土壤。 除了上述具体的研究，获得这种仪器将提高PI？的能力，以获得内部和外部资金的研究项目，并继续为本科生提供研究机会。 收购循环简单剪切装置将使PI处于有利地位，通过利用瓦尔帕莱索大学的合作建议获得资金？提高研究能力。

This award will fund the purchase of a SSH-100 Simple Shear System manufactured by GCTS Testing Systems of Tempe, Arizona. It will be supplemented and modified to allow it to perform cyclic triaxial testing and resonant column testing of soils, as well as cyclic simple shear testing. The cyclic shear apparatus will be the centerpiece of a research program to evaluate the effects of load path on energy-based pore pressure generation models. Energy-based pore pressure generation models can be used to help engineers predict how a soil mass will respond during an earthquake. In order to apply an energy-based pore pressure model to a specific soil, soil-specific parameters are determined by testing a specimen in a lab test, most commonly a cyclic triaxial test. These parameters allow the model to link the pore pressures generated in the specimen during loading to the shear energy dissipated in the soil. The question facing the users of energy-based models is whether the model developed is only valid for the loading conditions used to develop it (i.e., the load path applied by the test used), or if it is independent of loading conditions used and dependent only on the amount of energy dissipated. The PI?s research will use the SSH-100 Simple Shear System to quantify and clarify the effects that load paths have upon pore pressure generation in soils. In addition to the specific research described above, acquiring this instrumentation will improve the PI?s ability to obtain both internal and external funding for research projects and to continue to provide research opportunities for undergraduate students. Acquisition of the cyclic simple shear device will put the PI in a strong position to obtain funding through collaborative proposals that make use of Valparaiso University?s increased research capabilities.