Foundation and Open Pit Protection Design – Research Medical Center in Split
In the center of Split, as part of Križine Hospital, which is itself part of the University Hospital of Split, the construction of the Split Research Medical Center(IMCS) is planned. For the purposes of the construction, we made the main foundation and temporary open pit protection design.
Prior to creating the main foundation and open pit protection design for the mentioned facility, the geotechnical investigation and testing was previously carried out at the location. Given the defined spatial conditions at the location, the construction of a temporary open pit is planned, using a combination of excavation at a slope of 3V:1H within the rock mass and excavation at slopes of 1V:1H, 1.25V:1H and 3V:1H within the cover.
In zone 1 of the open pit (northern and part of the western portion of the project site), excavation is planned at a slope of 3V:1H. The protection of the excavation at a slope of 3V:1H within the marly rock mass is to be provided by the installation of self-drilling anchors with a minimum diameter of 38.0 mm and a length of 3.0 m, 6.0 m and 9.0 m, on a general grid of 2.50 m × 2.50 m, as well as shotcrete in three layers, each measuring 5.0 cm in thickness, between which Q-257 reinforcement mesh is to be placed in two layers.
In the northeastern part of the zone, above the actual excavation for the building, a wide excavation at a slope of 1.25V:1H is planned for the purposes of performing / expanding the parking lot.
In zone 2 of the open pit (eastern and southern parts of the project site), an excavation at a slope of 3V:1H is planned within the rock mass and a wide excavation at a slope of 1V:1H is planned within the cover. At the junction of the two, a berm with a width of 1.0 m is planned for the eastern part of the project site and a berm with a width of 2.0 m for the southern part of the project site. The protection of the excavation at a slope of 3V:1H within the marly rock mass is to be provided by the installation of self-drilling anchors with a minimum diameter of 38.0 mm and a length of 3.0 m, 4.0 m, 6.0 m and 9.0 m, on a general grid of 2.50 m × 2.50 m, as well as shotcrete in three layers, each 5.0 cm thick, between which the Q-257 reinforcing mesh is to be placed in two layers.
In zone 3 of the open pit, excavation is planned at a slope of 3V:1H. The protection of the excavation inside the cover is to be provided by the installation of self-drilling anchors with a minimum diameter of 38.0 mm and a length of 4.0 m, 6.0 m and 9.0 m, on a general grid of 1.75 m × 1.50 m (nailed soil), as well as shotcrete in three layers, each measuring 5.0 cm in thickness, between which the Q-257 reinforcing mesh is to be placed in two layers. The protection of the excavation at a slope of 3V:1H within the rock mass is to be provided by the installation of self-drilling anchors with a minimum diameter of 38.0 mm and a length of 3.0 m and 6.0 m, on a general grid of 2.50 m × 2.50 m, as well as shotcrete in three layers, each 5.0 cm thick, between which Q-257 reinforcing mesh is to be placed in two layers.
In zone 4 of the open pit, excavation is planned at a slope of 3V:1H within the limestone rock mass. Given that limestone is present intermittently along the excavation site, two types of protection are planned, depending on the state of the rock mass after excavation: protection of the excavation by temporarily installing a hexagonal protective mesh and protection of the excavation by installing self-drilling anchors.
In zone 5 of the open pit, for the purposes of the construction of the access ramp for the future building and the associated walls, a wide excavation at slopes of 1V:1H and 1.25V:1H is to be conducted within the cover of made ground and the highly eroded marl.
A shallow foundation for the future building is to be conducted on foundation base plates in two levels (+9.70 MASL and +12.85 MASL), with individual thicknesses of 80.0 cm and reinforcements / haunches at the locations of the building’s columns.
