BLF Bank Headquarters (Beirut)

Phase 1: Soil Investigation Campaign based on the indications of BUROHAPPOLD

■ Six boreholes, depths between 50 and 80m
■ Coring with Standard Penetration Tests, Pressuremeter tests and Lugeon Tests.
■ MASW, Downhole and ambient noise testing conducted

Purpose: Mapping of the soil stratigraphy; complement the geotechnical site investigation by identifying subsurface geophysical properties, fundamental resonance frequency, seismic wave velocities and other characteristics.

Phase 2: Geotechnical Consultancy Mission

Main shoring proposition:
■ Temporary and Partial Secant Pile Wall:
  – Non-reinforced Short Primary Piles Ø1080,
  – Reinforced Short Secondary Piles Ø880,
  – Reinforced Long Secondary Piles
■ Geothermal Open Loop System study:
  – Water inflow ≈150m3/hr
  – Water Temperature: 21°
Generates more than 400kW of cooling power.

Phase 3: Design of tension pile

■ Tension piles conceived below the raft to ensure the stability of the building in the temporary phase.
Piles will allow the following;
  – To stop the pumping process once the GF slab is executed,
  – To compensate for the load deficit between the uplift pressure and the deadweight of the structure, executed till the GF.