Tunnels and Mines

Tunnels are taken as cylindrical excavations in soil. Several methods of solution are available to define the profile of the settlement curves. The equations used are based on the normal probability (Gaussian) distribution theory. The user is required to define the estimated volume loss above the tunnel due to deformation. Tunset will then use this to define the settlement profile at the surface or specified depth.

Mines are taken as excavations of rectangular cross-section in rock. Only one method of solution is available. The equations used are based on an influence function/zone area approach to subsidence and horizontal displacement prediction. Stochastic influence functions are used.

Embedded Wall Excavations

Embedded wall excavations are described in plan as polygons with a level at each corner. Each is assigned horizontal and vertical surface movement curves that are used to calculate soil displacements. Settlements and horizontal ground displacements may be calculated for the construction of retaining walls and for excavation in front of the retaining walls to form restrained cuts or basements. Total displacements are calculated by summing those that result from each tunnel and embedded wall excavation.

Building Damage Assessment

Building Damage Assessment is calculated using the Burland (1997) assessment method. Buildings are specified by their locations and bending properties and associated with lines of displacement points and a set of damage category tensile strains that define the thresholds of each damage category.