Design and analysis of underground structures

  • What are the classification of underground structures?

    The underground structures or openings can broadly be classified into three categories; (i) Tunnels, (ii) Cavern and underground openings and (iii) Cavities and mines..

  • What are the structures of the underground?

    The underground structures or openings can broadly be classified into three categories; (i) Tunnels, (ii) Cavern and underground openings and (iii) Cavities and mines.
    Tunnel is a horizontal or near horizontal excavation that is open to the ground surface at each end..

  • What is seismic design of underground structures?

    In general, seismic design loads for underground structures are characterized in terms of the deformations and strains imposed on the structure by the surrounding ground, often due to the interaction between the two.
    In contrast, surface structures are designed for the inertial forces caused by ground accelerations..

  • What is the construction method for underground structure?

    Cut and cover is the most commonly used underground, construction method.
    This is essentially an open excavation in which the structure is supported by retaining walls while it is built and then backfill placed above the completed facility..

  • Another vital role of underground construction is the provision of space for essential utilities, including water, electricity, and sewage systems.
    By moving these vital services below ground, cities can utilize the space above for other purposes such as residential, commercial, or recreational areas.
The report describes the overall philosophy used in the design of underground structures, and introduces basic concepts of seismic hazard analysis and methods 

How important is seismic design for underground structures & tunnels?

The proper estimation of impedance functions for underground structures and tunnels, the rational estimation of the seismic earth pressures on the side-walls and the estimation of the seismic shear stresses around the perimeter of the structure are still important open issues that can affect considerably the seismic design

What is a static analysis of underground structures?

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1 Static Analysis of Underground Structures-Tunnels Usually, the static analysis of underground structures in the transversal or the longitudinal direction, is using linear frame-type elements for the structure and constant linear springs to simulate the soil support

What should be considered when designing an underground structure?

In these situations, the underground structure must tolerate the expected fault displacements, and allow only minor damages

All faults must be identified to limit the length of special design section, and a risk-cost analysis should be run to determine if the design should be pursued


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