Assessment of Stabilization Methods to Control Surficial Slope Failures

Surficial failures occur frequently on the slopes of earthen embankments and earth fill dams which are predominantly rainfall induced. Desiccation cracks formed on the slope surfaces during dry summer like conditions accelerate the rainfall and runoff infiltration into underlying soil layers, which in turn will result an increase in the saturation of soil mass and loss of shear strength of soil that eventually result in surficial failures. The slopes of highway embankments need to be stabilized to arrest these surficial failures. In this research, several combinations of stabilizing agents including lime, fibers and compost were used to verify their efficacy in alleviating surficial cracking and slope failures. For this purpose, test sections with different surficial slope treatments were constructed along the slopes of the Grapevine earthen dam which also serves as a roadway embankment. Five test sections including four treated sections with additive dosages determined from the laboratory studies and one control section with no surface treatment were constructed. The test sections were instrumented with moisture probes, temperature sensors and vertical inclinometers to understand the efficacy of treatments to mitigate desiccation cracking from moisture content and seasonal temperature variations. The vertical movements of the test sections were also monitored by conducting surface profiling using elevation surveys. Based on the analysis of the data, the 8% lime with 0.15% fibers and the 8%lime treatment are found to be the most effective treatments so far to prevent desiccation cracking and surficial failures of high plasticity clays.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References; Tables;
  • Pagination: 16p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01154620
  • Record Type: Publication
  • Report/Paper Numbers: 10-2491
  • Files: BTRIS, TRIS, TRB
  • Created Date: Jan 25 2010 11:10AM