@article{oai:muroran-it.repo.nii.ac.jp:00005606,
 author = {KISHI,  Norimitsu and 岸, 徳光 and 佐藤, 昌志 and SATO, Masashi and 中野, 修 and Nakano, Osamu},
 journal = {構造工学論文集. A},
 month = {Mar},
 note = {application/pdf, Usually sand cushion has been used to decrease impact forces generated by falling rocks on the roof of rock-shed structure. However, it is made clear that sand cushion does not effectively work for decreasing and dispersing the transmitted impact forces. In order to improve the absorbing capacity of sand cushion, three-layered absorbing system was developed which is normally composed of 50 cm thick upper sand layer, 20 cm RC core slab and 50 cm thick EPS layer. In this paper, the study on absorbing capacity of the three-layered absorbing systems is reported based on the field impact tests. Different types of the three-layered absorbing system, varying the materials and thicknesses of upper and lower layers are used for comparison of absorbing capacity. From these results, it is made clear that the normal type of absorbing system is the beat one among tham against a 3 tf rock dropping from a maximum 30 m height.},
 pages = {1257--1265},
 title = {三層緩衝構造の緩衝性能に関する大型屋外実験},
 volume = {41},
 year = {1995},
 yomi = {キシ, ノリミツ and サトウ, マサシ and ナカノ, オサム}
}