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该文系日本九州煤炭技术研究中心与九州大学生产科学研究所合作进行的试验研究成果。该试验采用围压型的三轴压缩试验装置和空隙水压负荷试验装置对孔隙率不同的长崎县产的相浦砂岩和山口县产的秋吉大理石以及福岛县产的荻野凝灰岩注水影响试验,取得了注水卸压的基础资料。结论是:对孔隙率极小的岩石,既或含水,其破坏强度也基本不变,但若向试验内部强制施加空隙水压负荷,则破坏强度即下降;对孔隙率比较大的岩石,结论与前人试验一样,若含水,其破坏强度就下降,若向试样内部强制施加空隙水压负荷,其强度下降就更明显;在围压一定时,向试样强制施加变化的空隙水压负荷时,其破坏强度随负荷大小而变化;空隙水压示出了三轴压缩试验结果,一条包络线示出了考虑粒子接触面积比的岩石特性并符合有效应力定律。
The text is the Kyushu Coal Research Center of Japan and Kyushu University Institute of Production Cooperation experimental results. In this experiment, the confining-pressure type triaxial compression test apparatus and the pore hydraulic load test apparatus were used to test the effect of water injection on the ripples of Ariake in Nagasaki Prefecture and Akitagawa in Yamaguchi Prefecture, Made the basic information of water pressure relief. The conclusion is: for rocks with very small porosity, either water or water, the failure strength is basically unchanged, but if the water pressure load is forced to the interior of the test, the failure strength will decrease; for the rock with relatively high porosity, the conclusion As in the previous experiments, if the water content is too low, the failure strength will decrease. If the void pressure load is forced on the specimen, the strength decrease will be more obvious. When the confining pressure is constant, the void pressure Under load, the failure strength varies with the load. The void pressure shows the triaxial compression test results. An envelope shows the rock properties considering the particle contact area ratio and complies with the law of effective stress.