Soil improvement with jet grouting for interconnection tunnels

Juan Paulín-Aguirre, Ruben González-Parilli, Rogelio Monroy-Salgado, Jacques Morey

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Ground Improvement/Remediation

ABSTRACT: project has an installed power of 40 m3/s. It pumps residual and pluvial waters from the Río de la Compañía tunnel into the Río de la Compañía channel, along which the liquid flows by gravity towards the Texcoco ex-lake. Generally speaking, the pumping plant consists of a Grid Shaft (Shaft 4 of the Río de la Compañía tunnel), connected to two pumping Shafts (Cárcamo 1 and Cárcamo 2) through two interconnecting tunnels, each with 5.0 m final diameter. As an alternative to the conventional system originally proposed for the construction of these tunnels (driven metal pipes), a new construction method was proposed and justified: the excavation of both tunnels by conventional methods, even in soft clayey soil, with the previous construction of two beds of soil improved by Jet-Grouting located between the Grid Shafts and the Cárcamos, all along the tunnels. In relation to the Jet Grouting, this document describes the works of the testing panel, its conclusions and the execution process of the definitive soil beds.

RESUMEN: tiene una potencia instalada para un gasto de bombeo de 40 m3/s. Su objetivo es desalojar las aguas residuales y pluviales provenientes del túnel Río de la Compañía al canal del mismo nombre para que fluya por gravedad hacia el ex-lago de Texcoco. De forma general, la Planta de Bombeo está integrada por una lumbrera de rejillas (Lumbrera 4 del túnel Río de la Compañía), conectada a dos cárcamos de bombeo (Cárcamo 1 y Cárcamo 2) a través de dos túneles de interconexión de 5.0 m de diámetro interior final. Como una alternativa al sistema originalmente propuesto para la construcción de dichos túneles de interconexión (hincado convencional de tubos metálicos), se presentó y justificó una alternativa novedosa de construcción, la cual consistió en la excavación de los túneles mediante método convencional, aun siendo suelos arcillosos blandos, previa construcción de dos macizos de suelo mejorado a base de Jet Grouting, en la zona entre lumbrera de rejillas y cárcamos, a todo lo largo de los túneles. Relacionado al Jet Grouting, el trabajo que se presenta describe los trabajos del panel de prueba, las conclusiones del mismo y el proceso de ejecución de los macizos definitivos.

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