It may be necessary to dewater the excavation or at least pump water from the base of the excavation during construction. Soil is removed in stages and structural support is installed as required.A Geotechnical Engineer will use their understanding of Engineering design and ground behaviour to produce a design for the contractor. As excavations reach greater depths sheet piles and structural support must be provided to the walls, in the form of trench boxes or sheeted pits with props to prevent excavation wall collapse. Decide on the excavation method, battered or stepped sizes can often be used for shallower excavations. Scan and search for buried services, there is extreme danger of hitting an undetected power cable or gas main if the area is not scanned for services before work commences.The safe construction of an underground excavation involves several steps.How are underground excavations designed?
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