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滇中引水香炉山隧洞炭质页岩强度特性试验研究

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以滇中引水工程香炉山隧洞开挖揭露的炭质页岩为研究对象,开展了点荷载、单轴压缩和巴西劈裂试验,获得了该岩石的几种强度及强度转换系数,分析了试件破坏模式和岩石微观形貌.结果表明,炭质页岩平行层理面加载时强度低于垂直层理面加载时强度,具有强度各向异性;在平行和垂直层面加载条件下,炭质页岩的抗拉强度转换系数分别为1.40、0.90,与理论值接近;在平行和垂直层面加载条件下,炭质页岩的单轴抗压强度转换系数分别为7.19、8.03,换算的单轴抗压强度低于国际岩石力学学会和规范经验公式的结果,原因是弱层面和基质体内微观缺陷造成炭质页岩的单轴抗压强度较低.研究结果可为滇中引水工程香炉山隧洞炭质页岩强度的快速准确评价提供参考.
Experimental Study of Strength Properties of Carbonaceous Shale in Xianglushan Tunnel of Central Yunnan Water Diversion Project
The carbonaceous shale exposed during the excavation of the Xianglushan Tunnel of Central Yunnan Water Diversion Project was taken as the research object.Point load test,uniaxial compression test,and Brazilian splitting test were conducted to obtain several strengths and strength conversion coefficients.Failure modes of specimens and micro-scopic morphology were analyzed.The results show that the strength parallel to bedding planes is lower than that perpen-dicular to bedding planes,indicating strength anisotropy.The tensile strength conversion coefficients for parallel and per-pendicular to bedding planes are 1.40 and 0.90,respectively,which are close to the theoretical value.The uniaxial com-pressive strength conversion coefficients for parallel and perpendicular to bedding planes are 7.19 and 8.03,respectively.The converted uniaxial compressive strength is lower than the results of empirical formulas of the ISRM and specifica-tions,and the reason is that the uniaxial compressive strength of carbonaceous shale is low due to the microscopic defects in weak layer and matrix body.The research results can provide reference for the rapid and accurate evaluation of the strength of carbonaceous shale in the Xianglushan Tunnel of Water Diversion Project in Central Yunnan.

Central Yunnan Water DiversionXianglushan Tunnelcarbonaceous shalestrengthconversion coefficient

张泽甫、马旭强、张雨霆、曹立

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云南省滇中引水工程有限公司,云南 昆明 650000

长江科学院水利部岩土力学与工程重点试验室,湖北 武汉 430010

滇中引水 香炉山隧洞 炭质页岩 强度 转换系数

国家自然科学基金重点项目云南省重大科技专项计划项目中央级公益性科研院所基本科研业务费武汉英才项目北京江河水利发展基金会水利青年科技英才项目

U2340229202102AF080001-2CKSF2024343/YTCKSD20231241/YTYC202305

2024

10.20040/j.cnki.1000-7709.2024.20241055

水电能源科学
中国水力发电工程学会 华中科技大学 武汉国测三联水电设备有限公司

水电能源科学

CSTPCD北大核心
影响因子：0.525
ISSN：1000-7709
年,卷(期)：2024.42(10)
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