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Characterization and Progressive Failure Monitoring of Unstable Rock Slopes Using Seismic Resonance Measurements.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Characterization and Progressive Failure Monitoring of Unstable Rock Slopes Using Seismic Resonance Measurements./
Author:	Jensen, Erin Katherine.
Description:	1 online resource (168 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-04, Section: B.
Contained By:	Dissertations Abstracts International85-04B.
Subject:	Geological engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798380590075

Characterization and Progressive Failure Monitoring of Unstable Rock Slopes Using Seismic Resonance Measurements.
Jensen, Erin Katherine.

Characterization and Progressive Failure Monitoring of Unstable Rock Slopes Using Seismic Resonance Measurements. - 1 online resource (168 pages)

Source: Dissertations Abstracts International, Volume: 85-04, Section: B.

Thesis (Ph.D.)--The University of Utah, 2023.

Includes bibliographical references

Rock slope hazard assessments and effective mitigation measures require accurate instability characterization, including boundary conditions, material properties, and kinematics, in addition to long-term monitoring to assess changes over time. Whereas conventional geotechnical approaches can be costly, invasive, or require long-term measurements, passive seismic methods offer a noninvasive, surface-based alternative. In-situ ambient vibration monitoring has emerged as an effective technique for rock slope instability characterization and monitoring that can be used to detect and map instability features and measure internal physical changes preceding failure. Additionally, advancements in seismometer technology and the increasing availability of low-cost instruments have improved the viability and adaptability of this approach. We conducted a temporary nodal geophone array deployment at a 400,000 m3 toppling rock slab at Courthouse Mesa in Utah, USA, and we used ambient noise cross-correlation to identify the resonance modes of the instability and their corresponding modal deflections. Comparing experimental data with the results of numerical modal analysis helped refine a geologic model of the instability, allowing for improved characterization of crack depth and boundary conditions not easily attainable from surficial measurements. We also collected 3 years of continuous single-station ambient vibration data and complementary crack aperture measurements from the Courthouse Mesa site to assess instability behavior over time. Tracking frequency and crack opening along with changing meteorological conditions during the monitoring period revealed a predominant influence of thermomechanical effects on seasonal instability behavior, as well as differences in the long-term response of frequency and crack opening. Lastly, we conducted conceptual numerical experiments using static and dynamic discontinuum models to investigate the applicability of in-situ ambient vibration monitoring for various rock slope failure kinematics. Modeling demonstrated the ability to track resonance frequencies during progressive failure and provided new information on anticipated changes in resonance behavior. The results and analyses presented in this dissertation aim to improve the application of seismic resonance measurements to characterize and monitor unstable rock slopes in support of hazard assessment and mitigation across various settings.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380590075Subjects--Topical Terms:

1186227
Geological engineering.
Subjects--Index Terms:

Discontinuum modelingIndex Terms--Genre/Form:

554714
Electronic books.

Characterization and Progressive Failure Monitoring of Unstable Rock Slopes Using Seismic Resonance Measurements.
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