Vancouver Technical Presentations

 

Tuesday, February 20, 2018
Uber Room, Steamworks Pub
375 Water Street
Vancouver, BC

Members of the Canadian Dam Association and others interested in the dam industry in British Columbia are getting together to learn and share.

Agenda:

5:30 pm - 6:00 pm       Social Hour - Appetizers will be provided 
         
6:00 pm - 6:45 pm
      Technical Presentation 1: Risk Assessment and Management Using Layers of Protection Analysis and Bowties
Paul M. Bedell, M.E.Sc., P.Eng. - Principal Senior Geotechnical Engineer, Golder Associates
                                                           
6:45 pm - 7:30 pm       Technical Presentation 2: Evaluating the Seismic Performance of Dams and Navigation Structures: Experiences, Challenges and Lessons Learnt
Ali Rasekh, PhD, P.Eng., -  Associate, Waterpower & Dams, Stantec
         
 7:30 pm onwards       Networking

Abstracts of the presentations are available on this webpage. 

Fee:
$10 for CDA members
$15 for non-members

Includes GST.

Cash only at the door.
Memberships will be available at the door.

Space is limited, and last year's event sold out, so register now!

Registration: Cori.Creba@tetratech.com



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Risk Assessment and Management Using Layers of Protection Analysis and Bowties

Paul M. Bedell, M.E.Sc., P.Eng. - Principal Senior Geotechnical Engineer  at Golder Associates

Biography:

Paul is a geotechnical engineer with over 22 years of experience in mine waste management. He is a Principal of Golder Associates Ltd., where he has spent his entire career, and is based in Vancouver.

He has worked on projects across North America, including the high Arctic, Mexico, South America, Africa, and Mongolia. He is an engineering manager for various mine waste management projects, provides support to operations, acts as the engineer of record on several sites, and is professionally registered in BC, ON, SK, and NT/NU.

Paul earned his BESc and MESc degrees from The University of Western Ontario.

Abstract:

The presentation will describe the use of a “layers of protection analysis” (LOPA) for a risk assessment for the design and operation of tailings dams. Presented using a bowtie diagram, the LOPA is considered to improve upon the more typical risk assessment approach of using unmitigated and mitigated risk heat maps.

High consequence / low likelihood risks are difficult to effectively communicate and manage by simple risk assessment tools like a heat map; tailings dam failures fall into this category.

The focus, therefore, needs to be on the controls—the barriers—and not the risk ranking. The identification of independent controls that are effective in preventing the consequence are useful in design, review, and operations. The auditability of the barriers and their reliability are significant strengths to this approach and aid in decisions regarding the adequacy (type and number) of barriers.

The bowtie analysis and presentation style allow for ease of clear and complete communication and may be readily linked to management systems and documentation whilst also being of critical importance in design, review, operations, and audits. An example case study will presented and discussed.
 

Evaluating the Seismic Performance of Dams and Navigation Structures: Experiences, Challenges and Lessons Learnt

Ali Rasekh, PhD, P.Eng., -  Associate, Waterpower & Dams

Biography:

Dr. Ali Rasekh completed his PhD at UBC in 2007 with a focus on numerical analysis and computational mechanics simulations. He is now an Associate engineer with Stantec and specializes in seismic analysis of concrete and rockfill dams.

Dr. Rasekh has led complex seismic analysis on projects such as the new Panama Canal expansion, Susitna-Watana arch dam feasibility study, and Cerro Corona tailings dam expansion project. He has performed diligent R&D studies for each project and has provided conceptual and hands-on solutions on time and within the budget.

He has supervised and trained engineers on simulation concepts and use of FEA software, and implemented CDA and FERC engineering guidelines in analysis and design in addition to engineering codes and regulations.


Abstract:

The presenter will share his experience with the seismic analysis and design of new Panama Canal expansion. The presentation will begin with the historical, geographical and economical background of the original canal and will continue with interesting information about the expansion project.

The fundamentals of the seismic analysis methodology and criteria used in evaluating the performance of this navigation structure will be explained next. This will include description of the two levels seismic performance evaluation, the seismic hazard assessment, design spectra and design earthquake histories. Some modeling details, parameters used and typical outcome will be illustrated.

A major challenge in estimating the seismic pressure on the culvert gate will be presented next and the study to address the challenge and lessons learnt will be discussed. An emphasize will be made on the importance of progression analysis in seismic analysis and benefits and shortcomings of simple and sophisticated analysis methods will be briefly explained. The presentation will conclude with pictures of construction and operation of the third set of locks.