2024-03-28T17:56:02Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02001557
2022-10-31T00:50:45Z
1642837622505:1642837855274:1642837856903
1642838403551:1642838406845
新しいタイプの高剛性試験機による岩質材料の一軸圧縮変形試験について
On Uniaxial Compression Tests of Rock-like Materials Using a New Type of High Stiff Testing Machine
川本, 朓万
渡嘉敷, 直彦
Kawamoto, Toshikazu
Tokashiki, Naohiko
rock-like material
a stiff testing machine
uniaxial compression test
cyclic loading
complete stress-strain curve
deformation
fatigue life
a progressive failure model
In planning of underground structures stability analysis of rock masses requires precise properties of fractured rocks.\nIn this paper, an experimental study of rock-like materials by uniaxial compression tests is presented using a new type of high stiff loading machine. Four kinds of rocks were selected, namely, Oya-stone (green tuff), Kobe-tuff, cement mortar and marble stone. Three differrent loading procedures were employed, i.e., static loading, incrementally cyclic loading and cyclic loading in post-failure region (see Fig. 4).\nThe machine used in these experiments has high stiffness about 312 ton/mm, and is capable of controlling either deformation or load of the specimen by mechanical action of the wedges under steel blocks installed in parallel with a specimen. This loading machine is very practical and efficient to obtain complete stress-strain curve of geologic materials.\nMain results are summarized as follows:\n(1) Obtained stress-strain curves are resolved into four characteristic regions due to the progress of fracturing, namely, intact, crack, fracture, and flow regions. The strains corresponding to each region are related to the strength, or the fablic of materials.\n(2) Tests of incrementally cyclic loading show that the envelop of unloading and reloading curve is coincident with the statical loading curve.\n(3) Relationship between plastic strain and total strain on incrementally cyclic loading are distributed by Weibull's probability.\n(4) Fatigue life under cyclic loading in post-failure region are influenced significantly by crypto-damage due to initial loading and applied stress level.
紀要論文
http://purl.org/coar/resource_type/c_6501
琉球大学工学部
1981-03
VoR
http://hdl.handle.net/20.500.12000/1392
0389-102X
AN0025048X
琉球大学工学部紀要
21
52
41
jpn
open access