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  Geotechnical Parameters defined by a Back-Analysis

  Tunnelling design in soft soils represents a special challenge for designers, under any condition in which it is intended to develop a project of this kind. Given this need, following are shown results of a case study from special conditions identified during the construction of the road tunnel named "La Estrella", which is part of the main road to the “La Línea Tunnel” in the area known as "Alto de La Línea", located at the central zone of Colombia, South America. A BackAnalysis was developed, using geotechnical instrumentation implemented, support installed and construction conditions in La Estrella Tunnel, it allowed to validate geotechnical parameters (E, Ko, ), and with a pattern identified, to generate recommendations for similar cases of tunnels built in volcanic materials and residual soils with low overburden. This analysis was developed using Phase 2, a geotechnical modeling tool for both soil and rock analysis using finite elements.

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