Earth Retention
Pacific Foundation plans and installs shoring systems that support constrained excavations while nearby work continues.
We select the wall system around excavation depth, soil and groundwater, nearby structures and utilities, property limits, access, and the sequence for work below grade.
How Earth Retention Works
Earth retention supports excavation faces, slopes, and nearby structures while below-grade work proceeds. The wall system must account for soil, groundwater, loads, excavation depth, property limits, and equipment access.
Pacific reviews wall layout, embedment, tieback feasibility, utilities, site access, excavation staging, and the handoff to permanent work.
When to Use Earth Retention
Earth retention should be reviewed when excavation, grade changes, slopes, or adjacent structures make unsupported cuts impractical. It is especially important when utilities, traffic, existing buildings, groundwater, property lines, or staged work constrain the site.
The system should be selected before excavation staging is locked, because anchor corridors, wall alignment, equipment access, and drainage can change the buildable approach.
Urban or tight excavations
Cuts near property lines, sidewalks, streets, utilities, buildings, or active operations.
Deep or staged cuts
Excavations that require wall support, tiebacks, anchors, bracing, or staged lagging and facing.
Water or difficult ground
Sites where groundwater, seepage, variable fill, soft soils, or obstructions affect wall type.
Temporary or permanent support
Systems that support construction only or remain part of the finished structure.
Equipment and Tooling
Retention equipment must fit the wall type and the available work line. Pile or anchor geometry, ground conditions, platform capacity, utilities, lagging or facing, and excavation lifts determine the setup.
Final equipment selection depends on wall alignment, access, ground conditions, pile or anchor details, groundwater, excavation staging, and adjacent constraints.
Project Experience
These projects show how wall type, access, adjacent structures, and excavation sequence shape the shoring plan.
Portland, OR / Water & Wastewater Washington Park Reservoir
Pacific Foundation supported the Washington Park Reservoir project with temporary and permanent soldier pile walls, tieback anchors, drilled shafts, dewatering, cathodic protection, instrumentation, tower-crane shafts, carved shotcrete...
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Salem, OR / Civic & Institutional CAMS III – Oregon Capitol
Pacific Foundation installed low-clearance micropiles and steel jacking towers to support structural jacking and the base-isolation sequence beneath the existing Capitol.
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Portland, OR / Bridges & Transportation Sellwood Bridge Replacement
Pacific Foundation supported the Sellwood Bridge replacement with permanent soil nail walls, permanent soldier pile walls with tiebacks, bridge-pile predrilling, and barge-mounted shaft foundation work.
View projectAdditional retention examples can be reviewed after wall geometry, access, and excavation constraints are known.
Pacific Capabilities
Pacific plans wall installation, excavation, support, drainage, testing, and turnover as one sequence. Early review helps contractors resolve access, anchor, utility, and handoff conflicts before excavation begins.
Earth Retention FAQs
How is the right shoring method selected?
The method depends on excavation depth, soil, groundwater, adjacent structures, utilities, property limits, easements, access, surcharge loads, movement criteria, and whether the system is temporary or permanent.
When are ground anchors or tiebacks needed?
Anchors or tiebacks are used when the wall design needs additional lateral support. Their feasibility depends on bond zone, easements, property limits, utilities, wall movement criteria, testing, and excavation sequence.
What should be sent for review?
Send wall drawings, excavation staging, geotechnical information, utility locations, adjacent structures, groundwater, access constraints, tieback assumptions, monitoring requirements, and schedule.
Discuss Your Shoring Scope
Send the wall drawings, excavation sequence, geotechnical report, and utility information. Pacific will review the retention plan against site access, adjacent structures, groundwater, and the work that follows excavation.