Virtual MEchanics GAthering -MEGA- Seminar: Breakage of transversely isotropic rock: observations from acoustic emission and X-ray computed tomography

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Event details

Date and time 08.04.2021 16:1517:30  
Place and room
https://epfl.zoom.us/s/84678428267 Passcode: 174387
Online https://epfl.zoom.us/s/84678428267
Speaker Guanyi Lu (GEL, EPFL)
Category Conferences - Seminars
Abstract Shale is typically an anisotropic material for which the mechanical characteristics can vary significantly along different orientations with regard to its bedding planes. In underground formations, the strength of shale shows strong dependence on the pre-existing weaknesses and the water content. This study is concerned with the mechanical behavior of Marcellus shale specimens under three-point bending where loading is applied in different directions with respect to its bedding plane orientation under both dry and saturated conditions. Acoustic Emission (AE) is recorded in order to investigate the nucleation of microfracturing via AE locations and Moment Tensor Analysis (MTA). Complimentary to the AE detection and analysis, X‐ray Computed Tomography (CT) is utilized to image internal damage sustained due to loading. Additionally, visualization of the internal fracture paths using image segmentation on the CT results show more complex fracture systems in parallel loading cases, which brings together localized fractures generated by different mechanisms.

Bio Guanyi Lu joined the Geo-energy Laboratory (GEL) of EPFL in 2021. He received his PhD in Civil Engineering from University of Pittsburgh. His research interests include rock/fracture mechanics, poroelasticity, modeling on solid-fluid coupled problems, time-dependent and anisotropic characteristics of rocks. In GEL, his research focuses on fracturing experiments in different rocks to explore the non-linearity/anisotropy/process zone/microcracking around the growing fractures, and developing numerical tools for injection in fractured fault systems.
 

Practical information

  • General public
  • Free

Organizer

  • MEGA.Seminar Organizing Committee

Tags

Solids Structures Fluids

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