Route 3, Randolph County, Missouri Landslide Remediation Study. Design and Construction

A landslide occurred at MoDOT Route 3 after an intense rain event in April of 2021. At the landslide location, 200+ feet deep, open pit quarries are located at the limits of the thirty foot right of way on both sides of the highway. Much of the landslide mass, comprised of overburden soils, slid down the highwall to the quarry floor. The initial study was to determine the extent and cause of the slide, stability of the 200-foot vertical high wall and shallow tunnels under the roadway connecting the two open pits. The final phase would develop feasible, economic alternatives for reopening the roadway. The site is located in a complex geologic environment at the very border of glaciation. Bedrock geology is further complicated by the location of a Pennsylvanian Age channel fill sandstone cut through the underlying Mississippian limestone. Several piezometers were installed and indicated a very erratic groundwater pattern in the glacial. The study involved performing borings, laboratory testing, soil slope stability analysis, rock slope stability analysis of the quarry wall, and rock stability analysis of the abandoned tunnels traversing the roadway. Several remedial alternatives were considered in the study and the favorite was relocating the roadway to one side away from the slide as well as lowering the grade to near the failure surface of the landslide. Also, the slide mass had to be removed and replaced with shot rock to provide long term stability and promote long-term internal drainage. Both were necessary to keep further movement of the ground into the deep open pit quarry. The consensus of the study led to final design which included relocating the roadway both horizontally and vertically. Included in the final design was removal and replacement of the slide mass.

• Record URL:
  • https://www.highwaygeologysymposium.org/wp-content/uploads/72nd-HGS-Tacoma-WA-2023-Proceedings_.pdf
• Supplemental Notes:
  • Copyright © 2023 Highway Geology Symposium (HGS).
• Corporate Authors:

  Highway Geology Symposium

  ,   United States 
• Authors:
  • Szturo, John F
  • Norrish, Norman
  • Duryee, Wayne A
• Conference:
  • 72nd Highway Geology Symposium (HGS 2023)
  • Location: Tacoma Washington, United States
  • Date: 2023-8-14 to 2023-8-17
• Publication Date: 2023

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Maps; Photos; References;
• Pagination: 22p
• Monograph Title: Proceedings of the 72nd Highway Geology Symposium (HGS 2023)

Subject/Index Terms

• TRT Terms: Highway design; Landslides; Overburdens; Quarries; Road construction
• Subject Areas: Design; Geotechnology; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 01892724
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 11 2023 11:42AM