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• W2182744544 abstract "Geosynthetics used in mining applications are subjected to harsh environments, yet in some cases are supposed to last forever. It is likely that geosynthetics will, sooner or later, fail due to harsh conditions, chemical/UV degradation, or re-polymerization under stress. In the short term, the probability of failure is dictated, as for any geostructure, by the variability of geo-materials parameters, variability of loading, duration of required performance, and site-specific conditions. The short-term design problem can be thought of as a “standard” geotechnical exercise, where standard risk-based decision-making (RBDM) approaches may be beneficial. On the basis of available knowledge, it is difficult to determine the longterm probability of failure of the geosynthetics and the structures incorporating them. The only thing we know is that it is likely they will, sooner or later fail; similarly to any other material, the longer the life span of the proposed structure, the higher the likelihood of geosynthetics failure. Thus the challenge is to design robust structures that, if and when the geosynthetics fail, result in consequences that are tolerable and do not lead to unacceptable environmental impacts. This paper explores these issues by way of two procedural example studies involving the use of geosynthetics in mine facilities. Geosynthetics used in mining applications are subjected to harsh environments and in some cases are supposed to “last forever.” Logsdon (2013) states that if one considers the various phases of mining, the scientific basis for understanding closure risk, and established engineering practice, it seems reasonable to suggest that the total planning period for management of mine wastes should be in the range of 200 to 500 years, and such considerations should include a semi-quantitative assessment of whether or not major changes in performance are likely to occur between approximately 500 and 1,000 years. Thus he proposes that the design-basis events that would yield off-site impacts or major rebuilding for a mine waste structure should have a probability of occurrence of less than ten percent during the proposed 200year period of performance. This means that the design basis for critical structures that would limit consequences to off-site-only impacts should be, following the same author, a 2,500-year recurrence" @default.
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• W2182744544 date "2014-01-01" @default.
• W2182744544 modified "2023-09-27" @default.
• W2182744544 title "Geosynthetics risk-based design in mining" @default.
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