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Case Study of the Observational Method: Northwestern University Simpson-Querrey Biomedical Research Center

机译：观察方法的案例研究：西北大学辛普森 - 查询生物医学研究中心

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Northwestern University Feinberg School of Medicine Simpson-Querrey Biomedical Research Center (SQBRC) is a new facility in the Streeterville neighborhood of Chicago. The earth retention system (ERS) for the facility supports as much as 18.0 m (59 feet) of excavation and provided support of surrounding areas including active city streets with active public utilities on the north and south, and existing buildings on the west and east. Marginal subsurface conditions including loose sands, soft clays, and a groundwater table with a ready supply of water from Lake Michigan steps away, further challenged the design of the ERS. Designers used an observational method in conjunction with a real-time monitoring system of automated total monitoring stations (ATMS) and shape accel arrays (SAA) to determine if contingency measures were required to stabilize the ERS during excavation. The design required addressing three (3) main factors: (1) maintain active public ways and utilities by controlling deflections below tolerable levels, (2) provide stabilizing lateral support for the existing structures during mass excavation due to unbalanced earth pressures, and (3) accommodate the excavation and substructure construction with minimal impact. Using a system of steel sheet piling along the perimeter along with a combination of internal bracing and grouted soil anchors, designers were able to support the required excavation depths and stay within allowable tolerances for deflection. The observational method allowed designers to eliminate potential additional levels of bracing required in the marginal subsurface conditions, thus saving money and time, as well as to continuously monitor the impacts of the excavation on the surrounding area. This paper discusses the ERS as designed and installed, the contingency measures anticipated, the monitoring system used, the results of the monitoring, and the benefits to the project of using an observational approach.
机译：西北大学Feinberg医学院Simpson-Querrey生物医学研究中心（SQBRC）是芝加哥街道街区的新设施。该设施的地球保留系统（ERS）支持高达18.0米（59英尺）的挖掘，并为北部和南部有活跃的城市街道提供了周边地区的支持，以及西部和东部的现有建筑物。边缘地下条件包括松散的沙子，软粘土和地下水位，带有从密歇根湖的遥远的水供应距离，进一步挑战了患者的设计。设计人员使用了一种观察方法，结合自动化总监测站（ATM）的实时监测系统和形状加速器阵列（SAA），以确定是否需要抗应力措施在挖掘过程中稳定ERS。所需的设计解决三（3）个主要因素：（1）通过控制可容许水平的偏转，（2）为在批量挖掘期间为现有结构提供稳定的横向支撑，（3 ）容纳挖掘和下部结构施工，影响最小。使用沿着周边的钢板堆积系统以及内部支撑和灌浆土锚的组合，设计师能够支持所需的挖掘深度并保持在允许的偏转公差范围内。观测方法允许设计人员在边缘地下条件下消除所需的潜在的额外支撑水平，从而节省金钱和时间，以及不断监测挖掘对周围地区的影响。本文讨论了设计和安装的人，应急措施预期，监测系统使用，监测结果，以及使用观察方法的项目的益处。

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