岩石供試体と耐圧強度について
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3. The Relation of Dry Condition and Wet Condition<BR>The writer tested the variation of bearing-power of rocks, under dry condition and wet condition.<BR>The experimental rocks are sandstone, slate, limestone and quartz-diorite. And the writer made the test-piece of 5 cm cube from them.<BR>The half of them was in dry condition and the rest was in wet condition which is steeped in water during 18 days. In these condition, the bearing-power of the test-pieces is tested and compared<BR>Consequently, the variation of bearing-power in wet condition and in dry condition was found.<BR>The result are as following : <BR>limestone decrease about 4%<BR>sandstone & quartz-diorite decrease about 10%<BR>slate decrease about 30%<BR>4. The Relation of Artificial Crack-surface of Test-piece and its Load-direction<BR>The writer made the three kinds of test-piece with quartz-diorite, and made several artificial cracks for them.<BR>And he studied the variation of the bearing power of test-pieces whose crack-surface is parallel or vertical to the load-direction.<BR>Consequently, the bearing power of test-piece have a little difference according to the case of parallel or of right-angle.<BR>And the case of right-angle was larger than the parallel case, about 8.8 %.<BR>5. The Relation between Artificial Cracks and these Bearing-power<BR>The writer made several test-pieces of 5 cm. cube, by slate, sandstone, limestone and quartz-diorite.<BR>And made the artificial cracks of 14 stripes, with parallel and same interval on a surface of test-piece.<BR>By means of them, he tested the bearing-power under the variations of crack direction and. road direction.<BR>As the result, in the case of which the crack surface is parallel to road-direction, the bearing-power decreases, as the cracks increase.<BR>In the case of right cross, the bearing-power increases as the cracks increase.<BR>And on the reverse, the bearing-power is decreased by more increasing cracks.<BR>6. The Relation of Bedding Plane and Load-direction<BR>The writer made the 78 pieces of test-piece from three kinds of slate-rocks, and divide them into two parts.<BR>And the bearing-power is tested in the two cases which the load-direction is vertical or parallel to the bedding plain.<BR>As the results, the bearing-power was stronger about 3% in the parallel load-direction to the bedding plain than in the vertical direction.<BR>Accordingly, the case of a bedding plain test-piece, it needs to decide either the load-direction is vertical or parallel to the bedding plain.<BR>The writer, on this case, uses the test-piece which the load-direction is vertical to the bedding plain.
- 社団法人 東京地学協会の論文