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Title: Mechanical and poroelastic behavior of porous tuff under drained and undrained conditions

Journal Article · · Bulletin of Engineering Geology and the Environment

A series of drained and undrained water-saturated constant mean-stress tests were performed to investigate the strength, elasticity, and poroelastic response of a water-saturated high porosity nonwelded tuff. Drained strengths are found to increase with increasing effective confining pressures. Elastic moduli increase with increasing mean stress. Undrained strengths are small due to development of high pore pressures that generate low effective confining pressures. Skempton’s values are pressure dependent and appear to reflect the onset of inelastic deformation. Permeabilities decrease after deformation from ~ 10–14 to ~ 10–16 m2 and are a function of the applied confining pressure. Deformation is dominated by pore collapse, compaction, and intense microfracturing, with the undrained tests favoring microfracture-dominant deformation and the drained tests favoring compaction-dominant deformation. These property determinations and observations are used to develop/parameterize physics-based models for underground explosives testing.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
Grant/Contract Number:
NA0003525
OSTI ID:
2455119
Report Number(s):
SAND--2024-13267J
Journal Information:
Bulletin of Engineering Geology and the Environment, Journal Name: Bulletin of Engineering Geology and the Environment Journal Issue: 10 Vol. 83; ISSN 1435-9529
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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