Slope Repair Problem & Solution

PROBLEM:  Infrastructure challenge, road creep slide in Santa Barbara, CA

CAUSE:  Gravity

SOLUTION:   InsulFoam Geofoam, a predictable & long lasting foundation for new pavement

Conejo Road

Conejo Road Geofoam Installation, Santa Barbara, CA

The City of Santa Barbara, CA had been experiencing continual maintenance concerns and costs due to a creep slide on Conejo Road. The project engineers and the city decided to permanently fix the problem by addressing the core cause of slope failure, gravity. During this 2012 project, the delivery of the InsulFoam Geofoam was delayed a few days because the contractor found that the asphalt pavement was up to 18″ thick due to continual settlement and repaving operations over the years.   John Madonna Construction of San Luis Obispo, CA was awarded the prime contract which included installing the EPS Geofoam. This was their 1st project using the ultra-lightweight large block fill material. Steve Alkyer of Insulfoam’s Chino, CA plant came to the jobsite to help train the installation crew on reading the shop drawings and hot wire cutting tools both provided by Insulfoam. This project utilized about 400 cubic yards of InsulFoam GF EPS19 which will provide a very predictable and long lasting foundation for the new pavement section in a difficult access residential neighborhood.

Time lapse video of the complete job install for the Conejo Road slope repair project in Santa Barbara.

 

Geofoam questions or need to discuss your project?

Contact Nico Sutmoller, Geofoam Specialist

nico.sutmoller@insulfoam.com

Connect with Nico on LinkedIn

Local Governments use Geofoam to Overcome Common Geotechnical Challenges

US50 near Montrose, CO

Over 100 times lighter than soil, EPS Geofoam continues to prove to be successful in high-volume fill and soil stabilization projects such as roads, bridges, levees and buildings.  Local city and county agencies have used Insulfoam Geofoam in many projects to simplify construction and reduce costs for public works projects.  Geofoam has many features and benefits to help overcome common geotechnical challenges:  high load-bearing capacities, does not decompose, decay, or produce undesirable gases or leachates, fully recyclable, durable and does not require maintenance under normal conditions throughout service life, unaffected by freeze-thaw cycles, moisture, and road salts.

Read more on how the following Geofoam applications were used from project to project in Government Engineering Journal’s article, Geofoam:  A Primer.

Slope Stabilization:

  • US50 near Montrose, CO
  • Highway 12 near White Pass in WA State
  • US101 in Northern CA

Lightweight Void Fill:

  • Fairfeld-Suisun Water Treatment Plant channel walls in Solano County, CA
  • Idaho Transportation Department

Lateral load reduction on Retaining Structures:

  • Pacific Street Bridge Widening in Omaha NE

Soft Soil Remediation:

  • Alaskan Way Viaduct replacement in Seattle, WA
  • I-80/I-65 interchange widening in Gary, IN
  • North Creek Levee raising in Bothell, WA

 

Infrastructure Challenges, Geofoam Solutions

Patterson Creek Bridge, Sammamish WA

CHALLENGE:  In a fairly remote area of unincorported King county in Washington State, an existing bridge was only 20 feet long which barely spanned the creek at high floodwater.  The existing bridge was founded on creosote treated wooden piles and needed to be replaced.  The new bridge which is 60 feet long and required new footings and abutment walls; however, over fairly soft soils.  How do you create a structure designed to hold up a bridge AND retain soil?

SOLUTION:  Insulfoam Geofoam was used to reduce differential settlement of the bridge approach fill AND was used to reduce the cost of the wall based on the reduction/elimination of the lateral pressures. You can view construction photos here.
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PROJECT INFORMATION
Project:  Patterson Creek Bridge Approach
Location:  Sammamish WA
Client:  King County DOT
Product Used:  Geofoam, 10-15 truckloads
Click here for Construction Photos