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Deformation of Granite with Crack-Seal Veins Under in situ Stress Conditions

March 25 @ 1:30 pm - 2:30 pm

Dr. Junlong Shang, Postdoctoral Research Fellow

What to Expect


Granite is one of the most common rocks in the Earth’s crust. Because of its favorable mechanical, hydrogeological, and geochemical properties, granite formations have been frequently involved in the subsurface energy-related activities such as long-term disposal of radioactive waste, and underground storage of oil, gas, and water. Granite is heterogeneous since it is made up of various mineral aggregates (basically quartz, feldspar, and mica) with distinctive texture and chemical compositions. The addition of mineral veins that tend to be ubiquitous in the upper crustal rocks further enhances the heterogenous nature of granite. Because of their distinctive mechanical properties compared with that of granite, veins can modulate the overall geo-mechanical behavior and integrity of rock. Understanding how the veins affect the mechanical characteristics of granite in in-situ stress conditions is of potential importance for evaluating the integrity and permeability evolution of veined granite, thereby maintaining a safer, purposeful, and environmental-friendly underground energy storage environment.

In this seminar, I will present a particle-based Discrete Element Method (DEM) study, to understand the deformation characteristics of granite with crack-seal veins (also termed as veined granite) under complex stress paths. This work addresses (1) failure characteristics of veined granite, and the evolution of microcracks in polyaxial compression; (2) effects of the mechanical and geometrical properties of veins on micromechanics, failure pattern, and overall strength of veined granite. It is expected that in the future, research on veined rocks can focus on complex THMC coupled behavior under simulated subsurface environment. The research probably can be approached by using both advanced well-designed laboratory apparatus (at lab. scale) and numerical techniques (at large scale).

Speaker Bio


Dr. Junlong Shang is a postdoc research fellow in rock mechanics at Nanyang Technological University, Singapore. He received his PhD in Earth Sciences from the University of Leeds in 2016 and conducts research in rock mechanics for underground space and earth resources. His research combines laboratory and numerical techniques to look at the mechanical behavior of anisotropic and fractured rocks under simulated subsurface environment conditions (e.g., high pressure, high temperature, complex in-situ stresses).

Dr Shang has published 26 peer-reviewed international journal papers in his field, one of which published in Engineering Geology has been selected as ESI highly cited paper. Dr Shang is a recipient of the prestigious ISRM Rocha Medal and an elected future leader of ARMA. He is currently serving as a scientific editor for the Journal of Rock Mechanics and Geotechnical Engineering (Elsevier), reviewer for around 20 international journals in this field, and co-Chair of the Scientific Committee for the 13th Asian Regional Conference (ARC13) of International Association for Engineering Geology (to be held in May 2021 in Singapore). He previously served as an organizing committee member for the 10th Asian Rock Mechanics Symposium of ISRM (2018), and chair for two technical sessions.

Organizer

Host: Ben Gilbert

Phone:

510-495-2748