The Deep Patch Technique for Landslide Repair

Details

• Creators:
  Helwany, M. Bassam
• Corporate Creators:
  Colorado. Department of Transportation
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Geosynthetics
  • Landslides
  • Tires
  • Material reinforcement
  • Repairing
  • Slope failure
  • Testing
  • shredded tires
• Publication/ Report Number:
  CTI-UCD-2-94
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Colorado
• Edition:
  Final Report
• Corporate Publisher:
  Colorado. Department of Transportation
• Description:
  This report describes the laboratory testing of the "USFS deep patch" technique and a Colorado Transportation Institute (CTI) modification of this technique for repairing landslides with geosynthetic reinforcement. The technique involves replacing sections of roadway lost due to landslides on top of a geosynthetically-reinforced embankment. The CTI modification involves replacing the reinforced slope with a geosynthetically-reinforced retaining wall with a truncated base. Both techniques rely on the cantilevering ability of the reinforced mass to limit the load on the foundation with a high slide potential. The testing was done in a plane-strain device, 8 ft high, 16 ft long, and 3 ft wide (2.44 m high, 4.88 m long, and 0.9 m wide) with a floor that can be lowered down to simulate the loss of support due to additional sliding of the foundation. Both road base fill and shredded tire fill were tested. The tests with road base showed that (1) both the USFS and CTI repair reduced effectively the adverse effects of local landsliding on the highway pavement by preventing crack propagation; (2) the USFS repair increased the stability of the repaired slope, which was in progressive failure, by reducing the stresses exerted on it; and (3) the CTI repair produced substantially greater stresses on its foundation due to the truncated base of the reinforced mass. These higher stresses of the CTI method will probably aggravate the stability of the slope which was in the state of progressive failure before repair. The CTI method, however, provides a wider base for pavement reconstruction. Tests with shredded tires found that excessive deformation makes them unsuitable for either repair technique.
• Format:
  PDF
• Funding:
  93-482
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/93755/dot_93755_DS1.pdf
• File Type:
  [PDF - 10.41 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:23177368c8eaf513b919279fead551b588369c583cc85177a80432b1cd7a44ef9bf21a372f129ef0ea8636e0d56301970014be3201e53542c4595812f9a04578