基于尺寸效应的红砂岩点荷载强度试验研究  

Experimental Study on Point Load Strength of Red Sandstone Based on Size Effect

作　　者：王兆远 乔磊 张芳 伍法权 陈银红 周晓霞 WANG Zhaoyuan;QIAO Lei;ZHANG Fang;WU Faquan;CHEN Yinhong;ZHOU Xiaoxia(School of Civil Engineering,Shaoxing University,Shaoxing,Zhejiang 312000,China;Experimental Center for Rock Mechanics and Geological Hazards,Shaoxing,Zhejiang 312000,China)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴市312000 [2]浙江省岩石力学与地质灾害实验中心,浙江绍兴市312000

出　　处：《矿业研究与开发》2022年第4期61-68,共8页Mining Research and Development

基　　金：国家自然科学基金项目(41831290);浙江省基础公益研究计划项目(LHQ20D020001)。

摘　　要：以云南武定南华采石场的红砂岩为研究对象,制备不同尺寸的岩心样,利用自行研制的便携式点荷载仪进行点荷载轴向试验、径向试验,并结合单轴压缩试验,分析尺寸效应对规则岩心样点荷载强度的影响以及点荷载强度与单轴抗压强度的关系。试验结果表明:点荷载强度具有明显的尺寸效应,在不同试验方式下,试件直径和厚度对点荷载强度值的影响不同;分析了形状系数与点荷载强度的关系,并提出不同试验方式下形状系数的建议取值范围;获得云南武定地区红砂岩点荷载强度和单轴抗压强度之间的经验转换公式,以期为该地区的工程应用提供参考。Taking the red sandstone of Nanhua quarry in Wuding County, Yunnan Province as the research object, the core samples with different sizes were prepared. The point load axial tests and radial tests were carried out by using the self-developed portable point load instrument. Combined with the uniaxial compression tests, the influence of size effect on the point load strength of regular core samples was analyzed, as well as the relationship between point load strength and uniaxial compressive strength. The test results show that the point load strength has an obvious size effect, and the influences of diameter and thickness of samples on the point load strength are different under different loading modes. The relationship between shape coefficient and point load strength was analyzed, and the recommended value range of shape coefficient under different loading modes was put forward. The empirical conversion formulas of point load strength and uniaxial compressive strength of red sandstone in this area were obtained, so as to provide a reference for engineering application in this area.

关 键 词：点荷载强度 尺寸效应 形状系数 经验转换公式 红砂岩 

分 类 号：TD313[矿业工程—矿井建设] TU452[建筑科学—岩土工程]