The last section of the first bored running tunel of the Porto Light Metro was excavated through weak residual soil, 2.5 to 4.0m below sensitive buldings. To minimise the risk of damagem a pre-treatment consisting of sub-horizontal micropiles and grout injection was performed from two shafts. Injections continued both during and after the passage of the TBM. A real-time web-hosted GIS-based monitoring system was set up for relaying both movemens and TBM parameters continuously during tunnel construction.
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Ruang Koleksi Umum
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