This project includes the geotechnical investigation and assessment of underground
soil and groundwater conditions and the design and construction of the temporary
lateral support system of a 5.50m excavation for the construction of underground
basements of the office building on the roads Varatasi and Favierou at the center
of Chalkis. The geotechnical investigation started with the preliminary opening
of two investigation shafts in the area of the excavationand continued with
the execution of a 12.0m rotary drilling borehole, in-situ
testing and collection of representative samples for laboratory testing. After
the completion of the borehole a standpipe piezometer was installed for the
monitoring of the water table level.
Based on the results of the performed geotechnical evaluation, the design of
the earth retaining system commenced for the selection of the appropriate lateral
support system. The design was based on the in-situ soil conditions and the
soil displacement restraints, due to the existence of buildings at the excavation
boundary. The lateral support system included the construction of vertical
steel HEB-IPB soldier piles, at various axial distances with a
10cm thick shotcrete lagging reinforced with a T188 steel grid and
the local use of rakers for the reduction of soil displacements at
the limits of the excavation with neighbouring buildings.
Design
and Construction of Temporary Excavation Works with piles for the Construction
of Underground Basements
