Pore Pressure Response to Probe Insertion and Thermal Gradient: ISIMU-II (In Situ Heat Transfer Experiment)
Abstract
The described experiment and the evaluation of its results were designed to assess the significance of the sediment cracking occurring during piezometer and heater probe insertion, and the influence of the cracking on the subsequent excess pore pressure and thermals fields to be measured in the In Situ Heat Transfer Experiment (ISHTE). The ISHTE is part of the Subseabed Disposal Program (SDP). Observed sediment radial cracking was estimated to penetrate to about one-half penetrator diameter. Measured penetrator insertion pore pressures and excess pore pressure dissipation indicate that sediment cracking has no identifiable influence at the penetration depth of the sensors. Proper prediction of the dissipation of insertion pore pressures was found to require incorporation of a smear factor, accounting for sediment remolding at the piezometer wall. An analytical model to concurrently describe the rise in excess pore pressure due to sediment heating and the pore pressure dissipation radially away from the heat source is described and the results of its application to the experiment data evaluated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1985
- Accession Number
- ADA158592
Entities
People
- Charles E. Hickox
- Huon Li
- John T. Burns
- Michael Riggins
- Philip J. Valent
Organizations
- United States Naval Research Laboratory