摘要
为了研究西藏玉龙铜矿边坡岩体在冻融循环作用下的损伤劣化,试验以石英砂岩和灰岩为试样,基于核磁共振技术对不同冻融循环次数下的岩石试样进行孔隙度测试,并采用伺服压力机和巴西劈裂试验进行单轴抗压强度测试和抗拉强度测试。研究了两组试样单轴抗压强度和抗拉强度与冻融循环之间的关系,分析了孔隙率变化量和强度损伤量的变化规律,基于孔隙度变化量建立了在不同冻融循环次数下的强度劣化模型,并利用试验数据对模型进行了拟合验证。试验结果表明:两组岩石试样的单轴抗压强度和抗拉强度均随冻融循环次数的增加而逐渐降低,孔隙度变化量及强度损失率随冻融循环次数的增加而逐渐增大。两组岩石试样的孔隙度变化量与相对强度服从指数函数关系,且具有很好的相关性,表明所建立的强度劣化模型可以很好的反映在不同冻融循环次数下的岩石强度演化规律,为玉龙铜矿后期开采技术提供理论依据。
In order to study the damage and degradation of slope rock mass of Yulong Copper Mine in Tibet under freeze-thaw cycles,quartz sandstone and limestone were used as samples in the test.Based on nuclear magnetic resonance technology,the porosity of rock samples under different freeze-thaw cycles was tested,and the uniaxial compressive strength and tensile strength were tested by servo press and Brazilian splitting test.The relationship between uniaxial compressive strength and tensile strength of two groups of samples with freeze-thaw cycles was studied,and the variation laws of porosity change and strength damage were analyzed.Based on the porosity change,the strength degradation models under different freeze-thaw cycles were established and verified by fitting the experimental data.The test results show that,with the increase of freeze-thaw cycles,the uniaxial compressive strength and tensile strength of the two groups of rock samples decrease gradually,and the porosity change and strength loss rate increase gradually.The porosity change and relative strength of the two groups of rock samples obey exponential function relationship,with a good correlation,which indicate that the established strength degradation model can well reflect the rock strength evolution law under different freeze-thaw cycles,which provides a theoretical basis for the later mining technology of Yulong Copper Mine.
作者
夏飞
赵文奎
廖勋
XIA Fei;ZHAO Wenkui;LIAO Xun(Tibet Yulong Copper Company of Western Mining Group Co.,Ltd.,Changdu,Tibet 854000,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第8期146-152,共7页
Mining Research and Development
关键词
冻融循环
损伤劣化模型
抗拉强度
抗压强度
孔隙度变化量
Freeze-thaw cycle
Damage degradation model
Tensile strength
Compressive strength
Porosity change
