不同形状红砂岩的点荷载强度试验研究

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英文篇名：Experimental Study on Point Load Strength of Red Sandstone with Different Shapes 作者：代领 ; 姚华彦 ; 张飞阳 ; 李宏国 英文作者：DAI Ling;YAO Hua-yan;ZHANG Fei-yang;LI Hong-guo;Civil and Hydraulic Engineering College,Hefei University of Technology; 关键词：点荷载强度 ; 单轴抗压强度 ; 红砂岩 ; 修正指数 ; 经验转换系数 英文关键词：point load strength;;uniaxial compression strength;;red sandstone;;modified index;;empirical conversion coefficient 中文刊名：科学技术与工程 英文刊名：Science Technology and Engineering 机构：合肥工业大学土木与水利工程学院; 出版日期：2019-03-08 出版单位：科学技术与工程 年：2019 期：07 基金：国家自然科学基金(51579063)资助 语种：中文; 页：214-219 页数：6 CN：11-4688/T ISSN：1671-1815 分类号：TU45

摘要

以湖北宜昌三峡库区马家沟侏罗纪红砂岩为对象,对岩石试样开展点荷载和单轴抗压强度试验,研究常见的试样形状(圆柱体、方块体、不规则块体)对点荷载强度的影响。采用国内外不同规范中修正指数m对试验数据进行计算分析,结果表明:对于不同形状的试样,确定好合适的修正指数m,获得的岩石点荷载强度指标相差不大,形状效应对点荷载强度IS(50)的影响可以忽略。结合红砂岩室内单轴抗压强度的试验结果,得到了适用于该地区红砂岩点荷载强度IS(50)与单轴抗压强度UCS的经验转换关系式。
        Based on the background of Hubei Yichang Three Gorges Reservoir of Majiagou Jurassic red sandstone,the influence of point load strength IS( 50)of common specimens with different shapes( cylindrical,cubical,irregular block) in the point load tests was studied. The test data were calculated and analyzed by using the modified index m in different codes at home and abroad. The results showed that,for samples with different shapes,if the appropriate modified index m was determined,the obtained rock point load strength indexes did not differ greatly,and the influence of shape effect on the point load strength IS( 50)could be ignored. Combined with the test results of indoor uniaxial compressive strength of red sandstone,the empirical conversion relationship between the load strength IS( 50)and the uniaxial compressive strength( UCS) of red sandstone in this area is obtained.

引文

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