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  Surface Stabilization and Settlement Mitigation of EPBM Excavations for Prague Metro

  In November 2012 two EPBMs completed 4.8 km excavations of twin tunnels for Metro V.A. in Prague. Roadway instability observed during the EPBMs shallow excavations triggered geophysical and drilling exploration works of the roadway subsoil, and intensive monitoring of ground and sewers. The exploration results indicated that the fill under the roadway and the tramway contained voids and had to be stabilized by surface drilling and grouting. The EPBMs excavations preceded underneath the stabilized roadway and tramway fill with the support of the EPB support pressures yet; the measured surface settlements locally exceeded the 10 mm settlement criterion. Two main sources of settlements were observed and were confirmed through geotechnical monitoring program, and by the data recorded by the EPBMs.

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