Settlement Screening Analysis for the Baltimore Red Line

摘要

The Baltimore Red Line is a proposed light rail transit line that includes a 3.4-mile DowntownrnTunnel (DTT) segment through Baltimore City. The DTT consists of twin bored, 23-foot diameter tunnels, andrnfive cut-and-cover underground stations. Construction of the DTT poses potential risk of excavation impactsrnto adjacent structures, which include masonry residential and commercial buildings, modern high rises, andrnhistoric structures. As part of a multi-stage evaluation, an initial screening assessment has been performedrnusing analytical and empirical methods to estimate settlements and related impacts due to tunnel and stationrnexcavations. The screening assessment included detailed estimation of volume losses, comparison of thernresults of different methods, damage thresholds for buildings and utilities, and identification of shortcomingsrnof the methods.