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首页> 外文会议>Annual highway geology symposium >Cooperative Geotechnical Designs to Build on Liquefiable and Compressible Soil in Salem, Massachusetts
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Cooperative Geotechnical Designs to Build on Liquefiable and Compressible Soil in Salem, Massachusetts

机译：在马萨诸塞州塞勒姆的可液化和可压缩土壤上进行岩土工程合作设计

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The Massachusetts Bay Transit Authority (MBTA) is addressing accessibility throughout their facilities. The Commuter Rail station in Salem, Massachusetts is upgrading their facility to improve site accessibility and increase parking capacity. Proposed improvements include a parking garage replacing the existing parking lot, a pedestrian bridge replacing the existing stairway connecting track level with downtown Salem, and a full-length high-level platform. Historical records, a geophysical survey, and an archaeological survey indicate structural remains from an historic train depot are largely intact beneath the surface of the existing lot. Subsurface explorations encountered fill overlying loose saturated sands above 40 feet of soft, compressible marine clay deposits extending to competent argillite rock at 60-80 feet below grade. Deep foundations bearing on rock were recommended for structural support of the garage, bridge, and platform. Potentially liquefiable sands, the potential for lateral spreading, and a poor seismic site classification exist at the site. Ground improvement techniques were recommended to improve the subsurface soil conditions and limit liquefaction and lateral spread potential. Several value-engineering options were explored, including options to replace traditional deep foundations with drilled displacement columns for garage support, using shallow retaining wall foundations for platform support, and using a slab-on-grade instead of a structural slab. The resulting cooperative designs required additional coordination between the design team to maximize efficiency of the project budget.
机译：马萨诸塞州海湾运输管理局（MBTA）正在解决其整个设施的无障碍性问题。马萨诸塞州塞勒姆市的通勤铁路站正在升级其设施，以改善站点的可及性并增加停车位。拟议的改进措施包括：更换现有停车场的停车场，替换连接赛勒姆市区的现有台阶的人行天桥以及全长的高层平台。历史记录，地球物理勘测和考古勘测表明，历史悠久的火车仓库的结构性残骸在现存地表以下基本上完好无损。地下勘探遇到了40英尺高的柔软可压缩海洋粘土沉积物上方的松散饱和砂土，这些砂岩延伸到了品位低于60-80英尺的合格的泥石质岩石中。建议在岩石上加深的基础作为车库，桥梁和平台的结构支撑。潜在的可液化砂土，横向扩展的可能性以及地震现场分类不佳。建议使用地面改良技术来改善地下土壤条件，并限制液化和横向扩散的可能性。探讨了几种价值工程方案，包括用钻孔置换柱代替传统深基础作为车库支撑的方案，使用浅挡土墙基础作为平台支撑的方案以及使用地上平板而不是结构平板的选项。最终的合作设计需要设计团队之间进行额外的协调，以最大程度地提高项目预算的效率。

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