Lyle R.R.,Cementation Canada Inc. |
Hutchinson D.J.,Queens University
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015
As cold remote regions continue to develop, slopes underlain by ice-rich permafrost present a challenging geohazard. Addressing the hazard to new and existing mining, petroleum and civil infrastructure projects is further complicated by climate change. This paper presents an overview of slope instability processes in permafrost regions and the impact of climatic fluctuations on these processes. The goal is to improve our understanding of landslides in permafrost terrain to help guide any new development in cold regions. As a case study, the paper presents 10 years of observations of naturally-occurring permafrost-related landslides in a small area of the central Yukon Territory, Canada. Three large (>1 Mm3 displaced) landslides in the study area illustrate three distinct mass wasting processes. In 2009, widespread forest fire activity triggered many shallow landslides which have the potential to develop into larger slides. The landslides provide a warning of what can be expected if slopes underlain by ice-rich permafrost are subjected to disturbance of ground thermal regime. Anthropogenic disturbances also have the potential to trigger landslides on permafrost slopes and any new development in these areas must therefore consider these hazards. This work highlights the need for detailed permafrost mapping, landslide susceptibility mapping, and subsurface geotechnical characterization on or below slopes underlain by permafrost prior to any development. © The authors and ICE Publishing: All rights reserved, 2015. Source
Haydl H.M.,Cementation Canada Inc.
Practice Periodical on Structural Design and Construction
Personnel or ore-carrying conveyances traveling up and down mine shafts can experience a loss of control or encounter other emergency situations where its travel must then be slowed down and stopped. The methods to achieve this depend on how much damage to the conveyance and the impacted supporting structure can be tolerated and accepted by the design engineer. This paper examines several simplified methods of determining braking and impact forces of traveling conveyances. The first method assumes that no damage to the supporting structure occurs. The second method assumes that a portion of the impacting force is absorbed by elastomeric material placed on top of the supports. The third method gives an approximate way of estimating the damage to the impacted structure necessary to completely stop the conveyance. Numerical examples are presented to show the proposed procedures. These approximate methods should be considered as a first attempt to estimate the response of a complex problem. © 2015 American Society of Civil Engineers. Source
Hayd H.M.,Cementation Canada Inc.
Structural Stability Research Council Annual Stability Conference 2014, SSRC 2014
Access to underground mines is in many cases through vertical shafts. If unstable ground conditions are encountered, the shaft walls are lined with concrete. The cylindrical concrete walls are formed with steel plates that are reinforced with circumferential and vertical stiffeners. The structural design and analysis of these forms is discussed in this paper. It is shown that stability of the forms, when subjected to pressures from the concrete during construction, is the governing criteria for the design. It is pointed out, that in order to obtain a safe design; some input parameters for the analysis have to be based on practical experience with liner construction in vertical shafts. An illustrative example is presented. Source
Jones A.P.,Cementation Canada Inc. |
Lyle R.R.,Cementation Canada Inc. |
Wrixon S.,Cementation Canada Inc.
Canadian Mining Journal
The mine development crews are the first to encounter the realities of stress-related strain behavior of the rock. These hazards are encountered generally before the more comprehensive seismic monitoring and rockburst management systems, common in production areas, are in place. The objectives culminate in an effort to reduce the frequency or number of indicents involving workers in proximity to strainburst-prone rock by raising awareness to their possible causes, and to reduce associated consequences to achieve zero harm. This initiative also follows the regulatory guidelines of training workers in rockburst awareness in the Province of Ontario. In the course of new mine construction or of expanding mine workings, the mine development team is the first to encounter the realities of stress-related strain behavior of the rock. Source