倾斜荷载下岩石强度的高径比效应

金属矿山 ›› 2025, Vol. 54 ›› Issue (12): 70-79.

倾斜荷载下岩石强度的高径比效应

李鹏程^1,2　李大忠^3,4　杨家冕^1,2　陈开河³　潘　洪⁵

1.金属矿山开采安全与灾害防治全国重点实验室,安徽马鞍山 243000; 2.中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山 243000;3.湖北省海外地质事业中心,湖北武汉 430022; 4.武汉科技大学资源与环境工程学院,湖北武汉 430081;5.湖北柳树沟矿业股份有限公司,湖北宜昌 443145

出版日期:2025-12-15 发布日期:2025-12-30
作者简介:李鹏程(1993—),男,工程师,硕士。
基金资助:
深地国家科技重大专项(编号:2024ZD1003804)。

Height-diameter Ratio Effect of Rock Strength under Inclined Load

LI Pengcheng^1,2　LI Dazhong^3,4　YANG Jiamian^1,2　CHEN Kaihe³　PAN Hong⁵

1.State key Laboratory of Metal Mine Mining Safety and Disaster Prevention and Control,Maanshan 243000,China; 2.Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,China; 3.Overseas Geology Centre of Hubei Province,Wuhan 430022,China; 4.College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China; 5.Hubei Liushugou Mining Co.,Ltd.,Yichang 443145,China

Online:2025-12-15 Published:2025-12-30

摘要/Abstract

摘要： 掌握倾斜荷载下岩石强度的高径比效应是倾斜矿柱设计和稳定性分析的基础。以红砂岩为研究对象, 采用倾斜加载装置,开展5种加载角和4种高径比组合的20组岩石倾斜加载试验,获得每种加载条件下岩石的强度特征;在此基础上,建立了倾斜加载下岩石强度与高径比的线性函数关系,得出不同加载角下线性函数的截距和斜率均不相同,随着加载角的增大,截距变小而斜率增大;最后,基于Mohr-Coulomb强度理论,将高径比效应的力学机制解释为一种摩擦“端部效应”现象,且该效应受加载倾角的影响。研究结果表明,随着加载角的增加,岩石呈现单斜面剪切破坏;同一加载角,试样高径比越大,强度越低,与单轴压缩条件相比,在大倾角和高径比越大的组合试验方案下,岩石峰值荷载损失越多。研究结果对揭示矿柱等岩体工程强度的矿体/岩层倾角与尺寸效应具有重要意义。

关键词: 峰值强度　高径比效应　倾斜荷载　端部效应

Abstract: Mastering the height-diameter ratio effect of rock strength under inclined load is the basis of inclined pillar de sign and stability analysis.Taking red sandstone as the research object,20 groups of rock inclined loading tests with 5 loading angles and 4 height-diameter ratios were carried out by using inclined loading device,and the strength characteristics of rock under each loading condition was obtained.On this basis,the linear function relationship between rock strength and diameter height ratio under inclined loading is established.It is concluded that the intercept and slope of the linear function are different under different loading angles.With the increase of loading angle,the intercept decreases and the slope increases.Finally, based on the Mohr-Coulomb strength theory,the mechanical mechanism of the height-diameter ratio effect is interpreted as a friction "end effect" phenomenon,and this effect is affected by the loading angle.The results show that with the increase of loading angle,the rock presents a single slope shear failure.At the same loading angle,the larger the height-diameter ratio of the specimen is,the lower the strength is.Compared with the uniaxial compression condition,the peak load loss of the rock is more under the combined test scheme with large inclination angle and large height-diameter ratio.The research results are of great significance for revealing the ore/rock dip angle and size effect of rock mass engineering strength such as pillars.

Key words: peak strength,height-diameter ratio,inclined load,end effect

中图分类号:

TD315

李鹏程, 　李大忠, 　杨家冕, 　陈开河　潘　洪. 倾斜荷载下岩石强度的高径比效应[J]. 金属矿山, 2025, 54(12): 70-79.

LI Pengcheng, 　LI Dazhong, 　YANG Jiamian, 　CHEN Kaihe　PAN Hong. Height-diameter Ratio Effect of Rock Strength under Inclined Load[J]. Metal Mine, 2025, 54(12): 70-79.

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