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Abstract: The Mackenzie access of Higienópolis Station, of the Sao Paulo Line 4 subway consists of two siccative shafts, one of them was built several years ago and the construction of the second one began in 2012. When 31 m of the second shaft were excavated, it was a soil piping phenomena in the bottom of the shaft. To complete the construction of the Mackenzie Shaft the monitoring data was analyzed by...