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  Geotechnical Design of Bored Tunnels for Pune Phase 1 Underground section

  Pune is ranked 9th most population in India and in last decade the city has witnessed a rise in population as the people are migrating from different part of the country for job opportunities, which has put the city travel infrastructure to stress. There was a growing need for mass rapid transportation, however most of project is elevated viaduct consisting of prestressed concrete girders placed along the alignment and 5 kms of underground section including TBM and NATM tunnels and cut and cover stations. Tunnels were preferred in the areas having narrow roads, buildings and structures located in close proximity. Bored tunnels are expected to encounter a mixture of weak rock to hard rock. Considering all these aspects, the current study undertakes a preliminary analysis of parameters affecting the ground movements, distortions, changes in the loads, piezometric pressures, ground water seepage and settlements occurred due to bored tunnels and station excavation using finite element method by using RocScience (RS2) software. Tender documents will be studied and based on the given parameters, vertical and horizontal displacements while boring and construction of stations would be assessed. Also, based on the FEM results, optimum support system would be recommended. Finally, a comparative study will be conducted to analyze the predicted movements with the actual site data obtained from monitoring instruments.

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