Alternative Title

Paper No. 2.56

Location

St. Louis, Missouri

Session Start Date

3-8-1998

Session End Date

3-15-1998

Abstract

This paper describes the remediation of a 300-foot long slope failure on the north bank of River Des Peres along Ellendale Avenue near the intersection with Wellington Avenue in St. Louis, Missouri. The slope failure threatened the cast bound driving lane of Ellendale Avenue and a 24-inch high pressure gas line under a concrete swale along the south shoulder, and damaged the concrete channel side and bottom lining and a foulwater interceptor sewer in the River Des Peres channel. The failure occurred within a soil stratum that consists of soft to very soft, gray silt, clayey silt, silty clay and sandy silt with a trace of organics and wood. As an emergency measure. to protect Ellendale Avenue and the high pressure gas pipeline from the advancing slide scraps, The Metropolitan Saint Louis Sewer District (MSD) the project owner, approved an immediate installation of approximately 330 linear feet of PZ27 and PZ23 sheet pile sections that were driven to bedrock refusal along the top of the slope about 12 feet south of the road pavement. Data obtained from several inclinometers, installed to monitor the slope during and after the emergency remedial work, indicated no further significant movement of the slope behind the sheet pile wall but movement continued to occur at the toe of the slope. Analysis of the in place sheet pile system revealed the need for one row of rock anchored tiebacks to render an acceptable factor of safety against the sheet pile failure. In order to stabilize the failed slope utilizing the in place sheet pile wall and maintaining the same slope geometry to satisfy the hydraulic requirement of the channel, the slope was stabilized with a grouted rock buttress. The sheet pile wall and the stabilized slope have been performing satisfactorily since the completion of the remedial work.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-8-1998

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 8th, 12:00 AM Mar 15th, 12:00 AM

Remediation of River Des Peres Slope Failure − A Case History

St. Louis, Missouri

This paper describes the remediation of a 300-foot long slope failure on the north bank of River Des Peres along Ellendale Avenue near the intersection with Wellington Avenue in St. Louis, Missouri. The slope failure threatened the cast bound driving lane of Ellendale Avenue and a 24-inch high pressure gas line under a concrete swale along the south shoulder, and damaged the concrete channel side and bottom lining and a foulwater interceptor sewer in the River Des Peres channel. The failure occurred within a soil stratum that consists of soft to very soft, gray silt, clayey silt, silty clay and sandy silt with a trace of organics and wood. As an emergency measure. to protect Ellendale Avenue and the high pressure gas pipeline from the advancing slide scraps, The Metropolitan Saint Louis Sewer District (MSD) the project owner, approved an immediate installation of approximately 330 linear feet of PZ27 and PZ23 sheet pile sections that were driven to bedrock refusal along the top of the slope about 12 feet south of the road pavement. Data obtained from several inclinometers, installed to monitor the slope during and after the emergency remedial work, indicated no further significant movement of the slope behind the sheet pile wall but movement continued to occur at the toe of the slope. Analysis of the in place sheet pile system revealed the need for one row of rock anchored tiebacks to render an acceptable factor of safety against the sheet pile failure. In order to stabilize the failed slope utilizing the in place sheet pile wall and maintaining the same slope geometry to satisfy the hydraulic requirement of the channel, the slope was stabilized with a grouted rock buttress. The sheet pile wall and the stabilized slope have been performing satisfactorily since the completion of the remedial work.