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Research on Development of New Type of Absorbing System to Increase Anti-Impact Capacity of Constructed Rock-Sheds

提高人工岩棚抗冲击能力的新型吸能系统开发研究

基本信息

批准号：
07555139
负责人：
MATSUOKA Ken-ichi
金额：
$ 3.58万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555139/
关键词：
absorbing system impact load rock falling RC rock-shed PC rock-shed sand cushion three-layred absorbing system four-layred absorbing system

项目摘要

At present, a sand cushion is set onto the roof of rock-shed to decrease and to disperse the impact load due to rock falling. However, according tothe results from prototype steel weight falling tests onto the sand cushion, it was made clear that the sand cushion do not possess much absorbing and dispersing capacities against impact load and rock-sheds designed based on the impact load estimation with the empirical equation do not have much safety margin against rock falling assumed in design. Then common used rock-sheds should be taken effective counter measures to increase the safety margin.From this point of view, in this study, development and practical use of a new absorbing system envisioned with about two times absorbing capacity than that of the sand cushion, were tried. The project was composed of following research items :1) Researches on anti-impact behavior of RC/PC members in rock-shed structures by using prototype impact tests ;2) Researches on impact behavior of RC/PC ro … More ck-sheds with two types of obsorbing system, namely sand cushion and three-layred absorbing system ;3) In order to improve absorbing capacity of constructed rock-sheds with sand cushion against rock falling impact load, proposal of a four-layred absorbing system composed of the three-layred absorbing system and an additional sand cushion left on the roof ;4) Investigation on the practical applicability of the four-layred absorbing system in which prototype RC and Steel rock-sheds with the four-layred absorbing system were used in steel weight falling tests.The results obtained from this project were mainly summerized as follows :1) Impact behaviors of RC/PC members and RC/PC rock-sheds with sand cushion and/or three-layred absorbing system were made clear according to the results obtained from prototype imopact tests ;2) According to the results on impact behavior of RC/PC rock-sheds with the two types of absorbing system (sand cushion and three-layred absorbing system) by means of three-dimensional impact analysis method, many valuable data to establish a rational anti-impact design specification for rock-shed structures were made available ;3) It can be shown that the four-layred absorbing system proposed here to improve absorbing and dispersing capacities of constructed rock-sheds was superior to other system mechanically and economically. Less

目前，在岩棚顶部设置砂垫层是为了减小和分散落岩冲击荷载。然而，根据砂垫层的原型钢重落试验结果表明，砂垫层对冲击荷载的吸收和分散能力不强，根据经验方程估计冲击荷载设计的岩棚对落石的安全裕度也不大。对常用的石棚应采取有效的应对措施，增加安全余量。从这个角度来看，本研究尝试了一种新的吸收系统的开发和实际应用，该系统的吸收能力是砂垫的两倍左右。本项目主要包括以下研究项目：1)通过原型冲击试验研究岩棚结构RC/PC构件的抗冲击性能；2)采用砂垫和三层吸振两种吸振体系对RC/PC结构的冲击性能进行了研究；3)为提高带砂垫层的已建岩棚对落石冲击荷载的吸收能力，提出了由三层吸收系统和顶部附加砂垫层组成的四层吸收系统；4)采用原型钢筋混凝土和带有四层吸波系统的钢棚进行钢材落重试验，研究了四层吸波系统的实用性。主要总结如下：1)根据原型冲击试验结果，明确了RC/PC构件和带有砂垫层和/或三层吸震体系的RC/PC岩棚的冲击性能；2)采用三维冲击分析方法对两种吸振体系（砂垫和三层吸振体系）下RC/PC岩棚的冲击性能进行了研究，为建立合理的岩棚结构抗冲击设计规范提供了许多有价值的数据；(3)本文提出的四层吸波系统在力学和经济上均优于其他系统，以提高已建岩棚的吸波和分散能力。少