Piled Retaining Structures

Piled retaining structures are required for a variety of applications to support excavations for basements and infrastructure in temporary and permanent situations. These structures are generally constructed using rotary bored or drilled techniques in a contiguous or secant configuration or in a king post system. However, drilled micropile and bottom driven techniques can also be used to form these retaining structures for specific purposes where ground conditions permit.

To limit deflections and achieve greater retention heights, the walls can be propped or tied back using ground anchors at specific levels and spacing on the wall. The design of the retaining structures requires comprehensive ground investigation information in advance to specify the pile type and detail the diameter, length and pile spacing. When installed in a contiguous configuration, the pile spacing is critical to ensure piles do not clash (if positioned too close together) or cause instability of the retained soil (if spaced too far apart).