岩体体裂隙率野外测量及计算方法的研究

张杨 宁立波 尹峰 赵国红 白冰珂 朱晛亭

张杨, 宁立波, 尹峰, 赵国红, 白冰珂, 朱晛亭. 2020: 岩体体裂隙率野外测量及计算方法的研究. 工程地质学报, 28(1): 10-18. doi: 10.13544/j.cnki.jeg.2018-387
引用本文: 张杨, 宁立波, 尹峰, 赵国红, 白冰珂, 朱晛亭. 2020: 岩体体裂隙率野外测量及计算方法的研究. 工程地质学报, 28(1): 10-18. doi: 10.13544/j.cnki.jeg.2018-387
ZHANG Yang, NING Libo, YIN Feng, ZHAO Guohong, BAI Bingke, ZHU Xianting. 2020: NEW METHOD OF FIELD MEASUREMENT AND CALCULATION FOR VOLUMETRIC FRACTURE RATE OF ROCK MASS. JOURNAL OF ENGINEERING GEOLOGY, 28(1): 10-18. doi: 10.13544/j.cnki.jeg.2018-387
Citation: ZHANG Yang, NING Libo, YIN Feng, ZHAO Guohong, BAI Bingke, ZHU Xianting. 2020: NEW METHOD OF FIELD MEASUREMENT AND CALCULATION FOR VOLUMETRIC FRACTURE RATE OF ROCK MASS. JOURNAL OF ENGINEERING GEOLOGY, 28(1): 10-18. doi: 10.13544/j.cnki.jeg.2018-387

岩体体裂隙率野外测量及计算方法的研究

doi: 10.13544/j.cnki.jeg.2018-387
基金项目: 

国家自然科学基金 41572212

安徽省国土资源厅科技项目 KZ16Z523

详细信息
    作者简介:

    张杨(1992-),男,硕士生,主要从事水文地质、环境地质等方面的研究.E-mail: 931372325@qq.com

    通讯作者:

    宁立波(1966-),男,博士,副教授,主要从事水文地质、环境地质等方面的教学和科研工作.E-mail: ninglibo200294@163.com

  • 中图分类号: TU459+.9

NEW METHOD OF FIELD MEASUREMENT AND CALCULATION FOR VOLUMETRIC FRACTURE RATE OF ROCK MASS

Funds: 

the National Natural Science Foundation of China 41572212

the Technology Project of Department of Natural Resources of Anhui Province KZ16Z523

  • 摘要: 裂隙率作为表征岩体裂隙特征的一项重要参数,有线裂隙率、面裂隙率、体裂隙率3种表征方法。目前常用测线法、统计窗法获取线、面裂隙率仅能从一维或二维反映裂隙发育情况,其方法还存在测量结果随机性、应用受出露条件所限等不足;现有体裂隙率测量方法也存在着实际应用性较差、成本高等问题,尚缺乏简便易操作的野外测量方法。为此本文提出了一种新的野外测量岩体体裂隙率的工作方法——球体法。由于构造、成岩裂隙发育的组系性、方向性,球体法根据各组裂隙产状从不同方向进行观测,通过多次测量统计岩体出露面上裂隙的发育特征,推断岩体内部裂隙的发育状况,其值能更好地反映局部区域岩体内部裂隙发育程度。此外,在测量时利用专利仪器可以得到沿裂隙面法线方向上隙宽以及隙间距数据真实值,测量条件对出露面平整情况要求不高,测量结果受露头平整性影响不大,具有更好的实用性。本文以安庆大龙山采石场研究区为例应用球体法,野外现场测量表明该方法可以在较为方便操作的基础上实现快速测量;研究区体裂隙率均值为2.286%,集中分布在1% ~4%,结合研究区实际情况以及误差分析结果,球体法可以很好地反映研究区各个测量点的裂隙发育程度。
  • 图  1  正交裂隙、斜交裂隙测量真隙宽与视隙宽的区别

    Figure  1.  The distinctions between true-gap-width and pseudo-gap-width of fractures which are orthogonal or oblique to an outcrop plane

    图  2  三维球体裂隙率测量原理示意图

    Figure  2.  The schematic diagram showing method of measurement in a 3-dimensional sphere

    图  3  野外测量裂隙隙距以及仪器示意图

    a.野外裂隙隙距测量示意图;b.测量仪器

    Figure  3.  The schematic diagram showing the instrument to measure gap width of fractures

    图  4  体裂隙率计算示意图

    Figure  4.  The schematic diagram showing calculation method of volumetric fracture rate

    图  5  安庆大龙山集贤关研究区测量点分布图

    Figure  5.  The distribution diagram of every measurement point in Dalong Mountain, Anqing

    图  6  研究区1~18号测量点体裂隙率值频率分布图

    Figure  6.  The histograph of volumetric fracture rate of every measurement point

    表  1  No.1号测量点第1组裂隙第1次测量体积计算表

    Table  1.   Table for calculation volume of the No.1 fractures at No.1 measurement point for the first time

    测量次数 裂隙产状 裂隙编号 隙距hi/cm 隙宽ni/cm 裂隙切面体积/cm3
    $ {{V_i} = \pi {n_i}\left({{R^2} - h_i^2} \right)}$
    裂隙体积/cm3
    $ {{V_1} = \pi {n_1}{R^2} + \sum\nolimits_{i = 2}^n {} {V_i}}$
    第1次 NE22°∠43° 1 0.0 0.045 706.858 4140.874
    2 1.7 0.021 329.486
    3 5.5 0.020 310.358
    4 8.7 0.043 654.993
    5 12.6 0.063 926.758
    6 15.0 0.015 214.414
    7 19.5 0.030 399.563
    8 23.0 0.012 148.610
    9 26.5 0.030 338.868
    10 28.1 0.035 376.134
    11 44.6 0.023 73.823
    12 48.2 0.013 14.438
    下载: 导出CSV

    表  2  No.1号测量点裂隙4次测量计算结果

    Table  2.   The volumetric fracture rate calculations of No.1measurement point

    裂隙组(j) 类型 平均产状 测量次数 球体内单组裂隙体积/cm3 球体内平均裂隙体积/cm3 裂隙面法向裂隙率/%
    1 层面 NE25°∠46° 1 4140.87 3597.49 0.791
    2 3706.76
    3 3302.84
    4 3239.5
    2 构造 SE118°∠87° 1 3313.99 3419.68 0.653
    2 3802.93
    3 3092.21
    4 3469.62
    3 构造 NE44°∠77° 1 2144.68 1895.62 0.362
    2 2247.09
    3 1517.28
    4 1673.45
    4 构造 SE92°∠50° 1 681.11 820.78 0.157
    2 793.08
    3 684.18
    4 1124.77
    下载: 导出CSV

    表  3  研究区1~18号测量点体裂隙率值计算结果

    Table  3.   The volume fracture rate calculations of 1~18 measurement points

    测量点编号 所属宕口 体裂隙率/% 测量点编号 所属宕口 体裂隙率/% 测量点编号 所属宕口 体裂隙率/%
    1 西1 1.859 8 东1 1.978 15 东1 1.973
    2 西1 2.510 9 东1 5.023 16 西3 0.342
    3 西1 2.554 10 东1 1.366 17 西3 0.845
    4 西2 1.335 11 东1 2.582 18 西3 0.895
    5 西2 2.736 12 东1 4.190 均值 2.286
    6 西2 3.518 13 东1 2.853 最大值 5.023
    7 东1 1.818 14 东1 2.773 最小值 0.342
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-11-27
  • 录用日期:  2019-12-13
  • 刊出日期:  2020-02-25

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