Slip Repair Project
Pickering Associates was hired by Triad Hunter for a project involving 35,000 cubic yards of slip repair as a result of toe failure due to a subsurface failure that was not originally present during construction. Pickering Associates developed a plan for the fix which incorporated a large block segmental retaining wall using geogrid to help with toe support. The plan then called for controlled fill and embankment, with bonding benches and subsurface bench drains. The team also provided the design of rock blankets to mitigate surface slip repairs which have not yet been installed.
PROJECT DETAILS
- Location: Monroe County, Ohio
- Type: Repair
- Size: 35,000 cubic yards
- Contractor: Larry Lang Excavating, Inc.
Project Services
- Civil Engineering
- Structural Engineering
- Construction Administration
Our Process
The plan called for controlled fill and embankment, with bonding benches and subsurface bench drains.
Pickering Associates worked with a geotechnical engineer to coordinate soil borings, and with CTL for tri-axial laboratory testing to gather needed slope stability parameters. Our team performed stability modeling in conformance with ODNR horizontal well site regulations. Three different sections were identified, and solutions created to address the issues. Section one was regraded to reduce the amount of material acting at the top of the slope.
The work was to lay the slope back to a 4:1 or less, thus reducing load and improving the factor of safety for the slope. A containment berm was also reconstructed once complete. Section two required bench drainage to be installed and proper benching for fill activities. These changes brought the slope back to grade and created a gentler overall slope. Section three was also regraded after the removal of a waste pile.
