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Title:

Dynamic Response of Freshly Placed Full-Scale Concrete Drilled Shaft due to Vibration from Adjacent Shaft Installation

Accession Number:

01476686

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

A number of studies have been conducted in an effort to understand wave attenuation and sound response during installation of deep foundations. This research stems from the need to better understand the effect of vibration on freshly placed and maturing concrete within 24-hours after initial placement. Construction activities create vibratory inducing forces, which unaccounted for or unmitigated, have detrimental effects to existing and newly placed structures. The differences between common construction vibrations, and those produced during deep foundation construction, are the amplitudes and durations. The study focuses on effects during the installation of deep foundations through vibratory methods and the age effect of the vibrations on freshly placed concrete. The installation followed the Florida Department of Transportation (FDOT) guidelines. During the drilled shaft casing installation, vibration is transmitted from the source of installation to the surrounding soil causing ground motion affecting the adjacent structures. The intensity of the ground motion and the severity of the induced vibration depend on factors, such as soil type, form of amplitude-time history of the vibration, polarity of certain type of waves, and configuration of the adjacent structures. The field investigation monitored peak particle velocities during installation and their effect on freshly placed concrete. The principal findings from the field study were: (1) vibrations with peak particle velocities of up to 2.5 in/sec do not cause damage to the fresh concrete at distances of two times the shaft diameter and beyond, and (2) in general, a spacing of three times the shaft diameter is a safe specification for ensuring that shaft vibration does not damage the concrete.

Supplemental Notes:

This paper was sponsored by TRB committee AFS30 Foundations of Bridges and Other Structures.

Monograph Accession #:

01470560

Report/Paper Numbers:

13-4722

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Reddy, Dronnadula V
Gonzalez-Mier, Carlos
Sobhan, Khaled

Pagination:

17p

Publication Date:

2013

Conference:

Transportation Research Board 92nd Annual Meeting

Location: Washington DC, United States
Date: 2013-1-13 to 2013-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References (19) ; Tables

Geographic Terms:

Florida

Subject Areas:

Bridges and other structures; Construction; Geotechnology; Highways; I42: Soil Mechanics; I53: Construction of Bridges and Retaining Walls

Source Data:

Transportation Research Board Annual Meeting 2013 Paper #13-4722

Files:

TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:55PM