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冻融循环作用下花岗岩损伤的宏微观尺度研究

戚利荣 王家鼎 张登飞 张永双 李贞孝 孙嘉兴 马剑飞

戚利荣, 王家鼎, 张登飞, 张永双, 李贞孝, 孙嘉兴, 马剑飞. 冻融循环作用下花岗岩损伤的宏微观尺度研究[J]. 水文地质工程地质, 2021, 48(5): 65-73. doi: 10.16030/j.cnki.issn.1000-3665.202103073
引用本文: 戚利荣, 王家鼎, 张登飞, 张永双, 李贞孝, 孙嘉兴, 马剑飞. 冻融循环作用下花岗岩损伤的宏微观尺度研究[J]. 水文地质工程地质, 2021, 48(5): 65-73. doi: 10.16030/j.cnki.issn.1000-3665.202103073
QI Lirong, WANG Jiading, ZHANG Dengfei, ZHANG Yongshuang, LI Zhenxiao, SUN Jiaxing, MA Jianfei. A study of granite damage in the macro and microscopic scales under freezing-thawing cycles[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 65-73. doi: 10.16030/j.cnki.issn.1000-3665.202103073
Citation: QI Lirong, WANG Jiading, ZHANG Dengfei, ZHANG Yongshuang, LI Zhenxiao, SUN Jiaxing, MA Jianfei. A study of granite damage in the macro and microscopic scales under freezing-thawing cycles[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 65-73. doi: 10.16030/j.cnki.issn.1000-3665.202103073

冻融循环作用下花岗岩损伤的宏微观尺度研究

doi: 10.16030/j.cnki.issn.1000-3665.202103073
基金项目: 国家重点研发计划(2018YFC1504703);国家自然科学基金项目(41907233);中国地质调查局地质调查项目(20190505,DD20201123)
详细信息
    作者简介:

    戚利荣(1995-),男,博士研究生,研究方向为工程地质。E-mail:qlrnwu@163.com

    通讯作者:

    王家鼎(1962-),男,教授,博士生导师,主要从事水文地质与工程地质研究。E-mail:wangjd@nwu.edu.cn

  • 中图分类号: TU458+.3

A study of granite damage in the macro and microscopic scales under freezing-thawing cycles

  • 摘要: 岩石的冻融破坏是高原地区工程建设中不可忽视的自然灾害之一。冻融作用下岩石矿物的不均匀收缩和孔隙水冰相变导致岩石内部孔隙扩展造成的岩石损伤,对工程稳定具有极大的威胁。为了研究冻融循环下花岗岩的损伤规律,以川藏铁路沿线理塘县毛娅坝盆地乱石包高位远程滑坡为研究对象,针对滑带上花岗岩,通过冻融循环试验模拟高原寒冷的气候环境变化,对冻融循环后的花岗岩进行单轴压缩、电阻率和电镜扫描(SEM)试验,从宏微观多尺度综合探讨冻融循环作用对花岗岩损伤劣化的规律。从试验研究中发现:(1)冻融循环过程中花岗岩质量变化呈先减小后增大再减小的趋势,这与冻融循环引起试样表面颗粒掉落和内部裂隙扩展双重作用有关;(2)随着冻融循环次数增大,花岗岩的单轴抗压强度、弹性模量和黏聚力皆呈非线性衰减趋势,而内摩擦角仅在平均值附近微小波动;(3)当冻融循环次数增加时,由宏微观试验所确定的冻融损伤因子和冻融荷载耦合作用下的总损伤因子都呈增长趋势,说明冻融次数对于花岗岩的抗压强度影响较大。研究结果可为高原地区工程建设中衡量花岗岩冻融强度特性提供参考依据。
  • 图  1  乱包石滑坡及取样点位置

    Figure  1.  The Luanshibao landslide and the sampling site

    图  2  偏光显微镜下花岗岩岩相特征

    Figure  2.  Granite petrographic features under the polarized light microscope

    图  3  电阻率测试装置示意图

    Figure  3.  Resistivity testing device

    图  4  冻融循环后岩石质量变化率

    Figure  4.  Quality changes of marble specimen after freezing-thawing

    图  5  冻融循环后花岗岩电阻率变化

    Figure  5.  Changes in granite resistivity after freezing-thawing cycles

    图  6  冻融循环花岗岩的SEM图像(放大400倍)

    Figure  6.  SEM images of freezing-thawing granite (magnification is 400)

    图  7  花岗岩的分形维数与冻融次数关系

    Figure  7.  Fractal dimension of granite in relation to the number of freezing-thawing

    图  8  冻融花岗岩单轴压缩全过程应力-应变曲线

    Figure  8.  Uniaxial compressive stress-strain curve of freezing-thawing granite

    图  9  单轴抗压强度和弹性模量与冻融循环次数的关系

    Figure  9.  Uniaxial compressive strength and elasticity modulus as a function of number of freezing-thawing cycles

    图  10  单轴压缩下花岗岩的破坏模式

    Figure  10.  Failure modes of granite under uniaxial compression

    图  11  黏聚力和内摩擦角与冻融循环次数的关系

    Figure  11.  Cohesion and internal friction angle as a function of number of freezing-thawing cycles

    图  12  损伤因子与冻融次数关系

    Figure  12.  Various damage parameters with the number of freezing-thawing cycles

    表  1  花岗岩的物理力学性质

    Table  1.   Basic physical properties of the granite specimen

    岩性干密度/
    (g·m−3
    饱和密度/
    (g·m−3
    孔隙率/%吸水率/%饱和吸水率/%
    花岗岩2.642.680.380.480.56
    下载: 导出CSV

    表  2  花岗岩质量测试结果

    Table  2.   Quality changes of marble specimen after freezing-thawing

    样品编号试样质量N/g
    020406080100120
    1534.80534.46534.40534.53534.31534.04534.15
    2528.12527.82527.72528.03527.96527.62527.57
    3522.56522.21522.10522.18522.01521.74521.71
    4530.61530.09530.08530.12529.98529.77529.66
    5520.29519.93519.80519.97519.81519.50519.47
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-03-22
  • 修回日期:  2021-06-03
  • 网络出版日期:  2021-09-09
  • 刊出日期:  2021-09-10

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