Canadian Long Span Earth Covered Magazines – Design Challenges

Impact of earth fill overlap between CLSECMs, located side-side

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CLSECM Design challenges - 2018 Symposium(Final)

Impact of earth fill overlap between CLSECMs, located side-side

Sometimes, the earth fill between side-side siting of CLSECMs at standard scaled distance of 0.5 (D) results in overlap to varying heights, due to uneven topography and flatter slopes as constructed in CLSECM (Fig 7) In such instances, Canadian Licensing Criteria, based on NATO recommendations, require adjustments to side-side Scaled distance to ensure that the design storage quantity of NEQ can be maintained, as indicated below (metric No change in Design Scaled distance at 0.5 (D) – if overlap is less than ½ H (height of structure) Increase Design Scaled distance to 0.8 (D) - if overlap is greater than ½ H but less than ¾ H Increase Design Scaled distance to 1.1 (D) – if overlap is greater than ¾ H. This QD imposition drastically reduces the design storage quantity of A&E, if the overlap QD criteria is to be followed. However, this requirement also appears to be in conflict with the ECM design criteria, which only requires a minimum side-side Scaled distance of 0.5 (D. Important to note that such a requirement is not mandated in other publications related to ECM design/siting such as “DoD M DoD Contractor’s Safety Manual for Ammunition and Explosives, which permits total solid earth fill between side-side ECMs without restrictions on the design NEQ.

7 Regardless of the above differences, study is underway to examine the impact of solid earth fill (worst case scenario) between CLECMs on the overall structural integrity and design storage capacity. This study is to be performed by a) considering twin CLSECMs located side by side at D Scaled distance b) determining the internal blast effects from PES and, c) analyzing the impact of blast loads transmitted through the solid earth fill on the structural integrity of the sidewall of ES, the most critical component for this scenario. The results of this engineering analysis, soon to be completed, would either confirm or deny the need for QD adjustments from licensing perspectives.

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