Acoustic Siting and Verification of the Holding Capacity of Embedment Anchors
Abstract
In order to determine the holding capacity of a direct embedment anchor, a 3.5 kHz battery-powered pinger system (Pinger Probe) has been developed, tested and evaluated. In some applications, use of the Pinger Probe can eliminate the necessity for a pre-installation site-survey, and can eliminate navigational errors resulting from attempts to reoccupy a favorable site (by providing the capability for simultaneous siting and installation). The Pinger Probe works like a bottom-finding pinger providing, in addition, data on subbottom reflectors. By monitoring the acoustic returns on the ship's precision depth recorder, the following data are provided in real time during the anchor implantment: (1) soil thickness over bedrock, (2) an indication of soil type, (3) sediment stratification and seafloor topography with better horizontal and vertical resolution than from surface-operated systems, and (4) a measure of anchor fluke embedment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1978
- Accession Number
- ADA058713
Entities
People
- P. J. Valent
- R. J. Malloy
Organizations
- Naval Facilities Engineering Service Center