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Please use this identifier to cite or link to this item: http://hdl.handle.net/10258/1065

タイトル: 野外実験による敷砂の緩衝性能
その他のタイトル: Field test on absorbing capacity of sand cushion
著者: 岸, 徳光
中野, 修
松岡, 健一
西, 弘明
Issue Date: Mar-1993
出版者: 土木学会
引用: 構造工学論文集, 39A, pp.1587-1597, 1993
タイプ: Journal Article
抄録: To reduce the impact force by rock falling, sand cushion with 90 cm height is commonly used on the roof of rock-shed. The impact force in this case is usually evaluated by the conventional equation which is derived based on Hertz's contact theory. However, according to the analytical results by one-dimensinal and/or axisymmetric wave theory, the transmitted impact force to rigid base is to be twice of the inputed one. In this paper, to get the real impact force caused by rock falling, the large field test on heavy weight falling on sand cushion is performed. The heavy weights of 2 and 3 tf weight are used and they are dropped from a maximum 30m height. Measuring weight acceleration and transmitted stresses on the rigid base, two kind of impact force are estimated which are obtained from weight acceleration and summing up the transmitted stresses. From the results, it has been shows that 1) the maximum transmitted impact force may become the twice of one obtained from dropped weight, 2) the maximum transmitted impact force can be estimated using the conventional equation assuming Lame's constant λ = 1000 tf/m^2.
URI: http://hdl.handle.net/10258/1065
Rights: Copyright 1993 土木学会 ダウンロードを含むこの著作物の利用は、著作権法の私的使用及び引用の範囲に限り認められます。その範囲外の利用については、土木学会の承諾が必要です。
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