花コウ岩大型ビームの長期たわみを見いだす実験方法と最初の7年間の実験結果
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概要
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Hard rocks on the earth's surface are frequently observed at places as severely deformed and folded without fractures. How much would rocks flow under how large external forces through how long period of time of their application? The present experiments have been intended to answer this question. As for the rocks of the test-piece materials, granite was employed that forms the upper layer of the crust under the continents. Two large test-pieces of granite from one block were shaped into straight beams of 215 cm length with rectangular cross-sections of 12.3 cm width and 6.8 cm thickness. These two test-pieces are separately mounted freely on end support of blunt knife-edges at a distance of 210 cm, which are made of granite quite similar to the materials of the test-pieces. One of the two test-pieces called the unloaded beam bends under its own weight and the other called the center-loaded beam does under its own weight plus an extra center-load of 22.06 kg. The maximum bending stress produced in the unloaded beam is 12.8 kg/cm^2 and that in the center-loaded 24.8 kg/cm^2. The experiments started on August 7, 1957. Since then, the experiments have been continued and until today (end of Feb., 1965) a time of seven and a half years has elapsed. Our experiments are the experiments that shall be carried on without end. For finding vertical displacements of 11 measuring points at the upper surface of each of the test-pieces on end supports that would continue its secular bending, a dial guage of 0.01 mm/div is used to measure vertical coordinates of them which slides along a straight steel beam (SSB) of 103 cm length which is horizontally placed in the middle portion of the upper surface of the test-piece with SSB's three legs at fixed points. When the measurements are not performed, SSB is removed from the test-piece. Prior to the commencement of these measurements, the test-piece was mounted horizontally on two supports specially positioned as shown in Fig. 4 to produce no appreciable elastic bendings and the initial values of the vertical coordinates of the measuring points were found.
- 社団法人日本材料学会の論文
- 1965-06-15
著者
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