Design implications of analytical and laboratory studies of permanent abandonment plugs

Date

1999-02-01

Author

Akgün, Haluk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

208
views

0
downloads

We analyze analytically and numerically the stress distribution along the plug-rock interface and within an axially loaded plug emplaced in a borehole in rock. Experiments show that the interface strength increases with decreasing plug radius and with increasing plug length. Axial strength decreases as a power law of plug radius. An increase in the modulus ratio (ratio of plug modulus to rock modulus) increases the interface strength, until it levels off at a ratio of about 5.0. For short plugs, the tensile stresses may reach a magnitude significant to be of concern for long-term stability of the plug and of the host rock. Our studies suggest designing friction plugs with a length to radius ratio of at least 8.0. In practice, especially for short-term performance, e.g., emergency flood control or temporary diversions, a ratio of 8.0 may not be necessary or justified. For permanent abandonment plugs, it is essential to reduce the tensile stresses in the plug and in the host rock to a level that will minimize the risk of long-term deterioration. We recommend in situ experiments on larger diameter plugs to assess the validity of the proposed size effect extrapolation obtained in this study.

Subject Keywords

Geotechnical Engineering and Engineering Geology

URI

https://hdl.handle.net/11511/48216

Journal

CANADIAN GEOTECHNICAL JOURNAL

DOI

https://doi.org/10.1139/t98-089

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

Integrated nonlinear regression analysis of tracer and well test data Akın, Serhat (Elsevier BV, 2003-08-01) One frequent observation from conventional pressure transient test analysis is that field data match mathematical models derived for homogeneous systems. This observation suggests that pressure data as presently interpreted may not contain details concerning certain reservoir heterogeneities. On the other hand, tracer tests may be more sensitive to heterogeneous elements present in the reservoir because of the convective nature of the flow test. In this study, a possible improvement of conventional pressure...
Reference database for seismic ground-motion in Europe (RESORCE) AKKAR, SİNAN; SANDIKKAYA, M. A.; SENYURT, M.; SISI, A. Azari; Ay, Bekir Özer; TRAVERSA, P.; DOUGLAS, J.; COTTON, F.; LUZI, L.; HERNANDEZ, B.; GODEY, S. (Springer Science and Business Media LLC, 2014-02-01) This paper presents the overall procedure followed in order to assemble the most recent pan-European strong-motion databank: Reference Database for Seismic Ground-Motion in Europe (RESORCE). RESORCE is one of the products of the SeIsmic Ground Motion Assessment (SIGMA; projet-sigma.com) project. RESORCE is intended to be a single integrated accelerometric databank for Europe and surrounding areas for use in the development and testing of ground-motion models and for other engineering seismology and earthqua...
CPT-based probabilistic and deterministic assessment of in situ seismic soil liquefaction potential Moss, R. E. S.; Seed, R. B.; Kayen, R. E.; Stewart, J. P.; Kiureghian, A. Der; Çetin, Kemal Önder (American Society of Civil Engineers (ASCE), 2006-08-01) This paper presents a complete methodology for both probabilistic and deterministic assessment of seismic soil liquefaction triggering potential based on the cone penetration test (CPT). A comprehensive worldwide set of CPT-based liquefaction field case histories were compiled and back analyzed, and the data then used to develop probabilistic triggering correlations. Issues investigated in this study include improved normalization of CPT resistance measurements for the influence of effective overburden stre...
Practical Implementation of Generalized Force Vectors for the Multimodal Pushover Analysis of Building Structures Alici, F. Soner; Sucuoğlu, Haluk (SAGE Publications, 2015-05-01) A practical implementation of generalized multimodal pushover analysis is presented in this study, where the number of pushovers is reduced significantly in view of the number of modes contributing to seismic response. It has been demonstrated in two case studies that the reduced procedure for generalized pushover analysis is equally successful in estimating the maximum member deformations and forces under a ground excitation with reference to nonlinear response history analysis. It is further shown that th...
Estimation of RQD by digital image analysis using a shadow-based method Saricam, T.; Öztürk, Hasan (Elsevier BV, 2018-12-01) We propose a method for segmentation of cores and estimation of RQD from digital images of rows of core in core boxes in order to compute RQD in an automatic way by finding and locating natural fractures in cores and measuring intact core lengths. First, three digital true color images of a core box, with the same camera position but different light source positions, are taken using a high resolution camera. After detection of the core box with color thresholding, the sections of the box are detected by usi...

Citation Formats

H. Akgün, “Design implications of analytical and laboratory studies of permanent abandonment plugs,” CANADIAN GEOTECHNICAL JOURNAL, pp. 21–38, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48216.