Associated Event

Ground Support 2023
10–12 October 2023 | Perth, Western Australia
Hyatt Regency Perth

Workshop on Deformation-Based Support Design and Rockburst Hazard Assessment

13:00–17:00 AWST, 13 October 2023 & 07:30–12:00 AWST, 14 October 2023

Traders Lounge, Hyatt Regency Hotel, Perth, Western Australia

About the Workshop

This workshop focuses on support design for excavations in brittle rock, where displacements induced by sudden stress fracturing may consume much of the support’s capacity. It deals with the functionality of the support in deforming ground and with the consequences of mining‐induced support damage. It offers quantitative means to estimate the capacity of integrated support systems and a systematic approach to compare it with the static and dynamic demands imposed on the ground support. Because gradual and sudden stress fracturing not only loads the support, but also deforms it, part of its load and energy-dissipation capacity is gradually consumed, leaving less and less remnant capacity at the time when the support is needed, i.e., during a rockburst. If the support capacity can be consumed by deformation, it can also be restored by preventive support maintenance (PSM).

This concept for cost‐effective ground control is introduced and supported with operational evidence. Accounting for capacity consumption and integrating PSM into the mine development and operation schedule provides means for prudent asset management and opportunities for cost optimisation. Sudden stress fracturing of excavation walls emits seismic waves that can be used to identify the depth of strainbursting and the duration of the related rock mass bulking process. This provides essential input for support design in strainburst‐prone ground, which is a new focus of this workshop.

The rockburst hazard in strainbursting ground depends on the stress level (stress at mining stages and strength in geological domains), the amount and rate of sudden stress fracturing, intensity of ground motion, and consumed support capacity (co‐seismic and mining‐induced strain). These and other factors are used to establish the current and to forecast the anticipated rockburst hazards. This is another new focus of this workshop.

This workshop presents an integrated approach of deformation‐based support design (DBSD) using support demand and support capacity-assessment tools, and an innovative approach developed in collaboration with Newcrest Mining for rockburst hazard assessment (RBHA) using geological, stress, mining sequence, ground support and seismic data.

Day One: 12:15-17:00 AWST, 13 October 2023

Module 1 will be delivered via virtual presentation (Teams) by Professor Peter Kaiser. Workshop attendees to be in person at the Hyatt Regency.

12:10               Lunch, arrival tea and coffee, registration
13:00               Welcome and introduction
15:00-15:30   Afternoon break
17:00               Day one close

Module Topic
Deformation-based support design
Deficiencies of common support design approaches
Overview of strainburst process and DBSD principles
DBSD steps to overcome limitations of common ground–motion–centric design approach
Motivation and justification of change in design method and need for change management
Estimation of support demand
Estimation of remnant capacity of integrated support systems
Assessment of effectiveness of integrated support systems using the displacement safety margin concept

Day Two: 07:30-13:00 AWST, 14 October 2023

Module 2 will be delivered in person by Doctors Dmitriy Malovichko and Alex Rigby. Workshop attendees to be in person at the Hyatt Regency.

07:30               Arrival tea and coffee, registration
08:00               Workshop commences
10:00-10:30   Morning break
12:00               Workshop close
12:00-13:00   Lunch

Module Topic
Rockburst hazard assessment
Terminology – shakedown and strainbursting damage mechanisms, rockburst potential and rockburst hazard
Input of rockburst hazard assessment – rock mass properties, geometry of excavations, stress model, seismic data, ground support
Utilisation of seismic data – assessment of strainbursting depth and duration of bulking, probability and percentage of the dynamic realisation of extreme depth of failure, increase in the depth of failure and consumption of ground support capacity
Calculation and presentation of results – mapping of parameters and results to tunnel nodes, displacement versus energy plot of ground support capacity and demand, safety margin of displacement, annual rate of exceedance of R0, R3 and R5 damage
Utility of RBHA for forensic analyses and forecasting on future hazards

*Program is subject to change. Check for updates.

Workshop Presenters

Professor Peter Kaiser
Emeritus Professor
Laurentian University, Canada

Peter joined Laurentian University in 1987 as professor of mining engineering and chair for rock engineering and ground control at the Bharti School of Engineering. He was the founding president of MIRARCO and later was seconded to the Centre for Excellence in Mining Innovation as founding director and then as director of the Rio Tinto Centre for Underground Mine Construction. He is a specialist in applied research for underground mining and construction and brings extensive experience from both the industrial and academic sectors and has served as a consultant to numerous consulting engineers, mines, and public agencies. He is a fellow of the Engineering Institute of Canada (EIC) and the Canadian Academy of Engineers and in 2013 was awarded the Julian C. Smith Medal of the EIC for ‘Achievement in the Development of Canada’. He is the author of more than 400 geomechanics publications. In 2016, he has delivered the Muir Wood lecture at the WTC and the MTS lecture at the 50th US Rock Mechanics Symposium, and in 2019 he presented the Mueller lecture at the ISRM congress in Brazil on a topic related to this course, i.e., on moving ‘From common to best practices in underground rock engineering’. In the spirit of ‘moving to best practices in support design’, he has recently developed, in collaboration with Newcrest Mining and Freeport, the deformation-based support design methodology and has offered training courses around the world.

Dr Dmitriy Malovichko
Director and Head of Applied Seismology
Institute of Mine Seismology

Dmitriy is the director and head of Applied Seismology of the Institute of Mine Seismology (IMS). He has a PhD in Physics and Mathematical Science from the Institute of Physics of the Earth (Moscow, Russia). From 2000 until 2009, he worked at the Mining Institute (Perm, Russia) and was involved in regional seismic monitoring, local seismic observations in potash mines and karst caves, and engineering seismology projects. In 2009, he joined ISSI (South Africa), which later became the Institute of Mine Seismology (South Africa, Australia and Canada). He is responsible for seismological services for mines (interpretation of seismicity, investigation of large or damaging seismic events) and is involved in research projects in mine seismology. Dmitriy is interested in inferring information about seismic sources from seismic signals, the integration of seismic monitoring data with stress modelling, and the assessment of seismic and rockburst hazards associated with planned mining. Working with Newcrest Mining and others, he has developed the Rockburst Hazard Assessment (RBHA) methodology.

Dr Alex Rigby
Senior Seismologist
Institute of Mine Seismology

Alex is a seismologist at IMS. He studied physics and engineering at the University of Tasmania, receiving his PhD in 2021. He joined IMS in 2020 and is responsible for the development of numerical and statistical modelling methodologies and tools, with a focus on its integration with seismic data. He is also involved in research into seismic sources, particularly the dynamics of crush-type sources associated with failure near excavations.

Workshop Notes

Following workshop conclusion, approved presentation material shall be available to the workshop attendees.