Location

St. Louis, Missouri

Date

03 Jun 1993, 10:30 am - 12:30 pm

Abstract

Foundations for a power plant were constructed by drilling holes in cemented sand for 36" piers. The boreholes in the cemented sand did not cave. A major design change required the demolition of the original piers and pile caps with large hoe rams and the drilling of new 36" boreholes in the same location. The new drilling contractor experienced widespread caving, which he was unable to remedy. The authors first investigated the possibility that the second contractor used inferior equipment or techniques. Then the authors investigated the possibility that a loss in soil cohesion occurred due to the vibrations from pier/pile cap demolition and casing installation. Analyses performed included (1) peak particle velocity evaluation, (2) laterally loaded pile/fatigue analysis, and (3) finite element analysis. It was concluded that significant loss of cohesion due to these vibrations was plausible and that the loss of cohesion could account for the bole caving.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

3rd Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

University of Missouri--Rolla

Document Version

Final Version

Rights

© 1993 University of Missouri--Rolla, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Investigation of Hole Caving Due to Vibrations

St. Louis, Missouri

Foundations for a power plant were constructed by drilling holes in cemented sand for 36" piers. The boreholes in the cemented sand did not cave. A major design change required the demolition of the original piers and pile caps with large hoe rams and the drilling of new 36" boreholes in the same location. The new drilling contractor experienced widespread caving, which he was unable to remedy. The authors first investigated the possibility that the second contractor used inferior equipment or techniques. Then the authors investigated the possibility that a loss in soil cohesion occurred due to the vibrations from pier/pile cap demolition and casing installation. Analyses performed included (1) peak particle velocity evaluation, (2) laterally loaded pile/fatigue analysis, and (3) finite element analysis. It was concluded that significant loss of cohesion due to these vibrations was plausible and that the loss of cohesion could account for the bole caving.