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利用钻孔崩落数据再认识白鹤滩右岸地应力场特征

陈念 王成虎 陈平志 陈建林 周昊

陈念, 王成虎, 陈平志, 等, 2021. 利用钻孔崩落数据再认识白鹤滩右岸地应力场特征. 地质力学学报, 27 (3): 430-440. DOI: 10.12090/j.issn.1006-6616.2021.27.03.039
引用本文: 陈念, 王成虎, 陈平志, 等, 2021. 利用钻孔崩落数据再认识白鹤滩右岸地应力场特征. 地质力学学报, 27 (3): 430-440. DOI: 10.12090/j.issn.1006-6616.2021.27.03.039
CHEN Nian, WANG Chenghu, CHEN Pingzhi, et al., 2021. Re-analyzing the in-situ stress field in the right bank of the Baihetan hydroelectric power plant using the borehole breakout data. Journal of Geomechanics, 27 (3): 430-440. DOI: 10.12090/j.issn.1006-6616.2021.27.03.039
Citation: CHEN Nian, WANG Chenghu, CHEN Pingzhi, et al., 2021. Re-analyzing the in-situ stress field in the right bank of the Baihetan hydroelectric power plant using the borehole breakout data. Journal of Geomechanics, 27 (3): 430-440. DOI: 10.12090/j.issn.1006-6616.2021.27.03.039

利用钻孔崩落数据再认识白鹤滩右岸地应力场特征

doi: 10.12090/j.issn.1006-6616.2021.27.03.039
基金项目: 

国家自然科学基金面上项目 41574088

详细信息
    作者简介:

    陈念(1997-), 男, 硕士研究生, 主要从事地应力与数值模拟等相关研究。E-mail: chennian19@mails.ucas.ac.cn

    通讯作者:

    王成虎(1978-), 男, 博士, 研究员, 主要从事地应力与地质力学、断层力学等相关研究。E-mail: huchengwang@163.com

  • 中图分类号: P553

Re-analyzing the in-situ stress field in the right bank of the Baihetan hydroelectric power plant using the borehole breakout data

Funds: 

the General Programs of National Natural Science Foundation of China 41574088

  • 摘要: 白鹤滩水电站是仅次于三峡水电站的第二大水电站,位于中国西南地区川滇菱形块体内的金沙江上。通常地壳应力状态是影响地下工程安全的重要地质因素,对地下硐室稳定性分析具有重要意义。在水电站右岸厂房建设过程中,为了水电站的长期安全运营,采用超声波井下电视录井测试系统对白鹤滩右岸厂房锚固洞内7处钻孔进行测试,基于钻孔崩落数据计算了现今白鹤滩右岸厂房区域上方工程岩体的主应力方向。研究结果表明:白鹤滩右岸厂房区域最大水平主应力(SH)方向为北北东—南南西方向,主要受到构造应力、自重应力、河流剥蚀作用以及岸坡卸荷作用的共同影响,属于局部构造应力场。

     

  • 图  1  白鹤滩水电站区域地质构造图

    Figure  1.  Regional tectonic structure of the Baihetan hydroelectric power plant

    F1-South section of the Zemuhe fault; F2-North section of the Xiaojiang fault; F3-The Lianfeng fault; F4-The Zhaotong-ludian fault; F5-South section of the Daliangshan fault; F6-The Dagiaohe-Puduhe fault; F7-The Ninghui fault

    图  2  钻孔破坏(钻孔崩落与钻孔诱发张裂隙)形成原理

    Figure  2.  Schematic diagram of borehole failure (borehole breakouts and drilling-induced tensile fractures)

    图  3  井下电视图像示例图

    Figure  3.  Example of integrative ultrasonic borehole imaging system

    图  4  右岸厂房顶拱超声波测试点布置示意图(俯视)

    Figure  4.  Schematic diagram of the ultrasonic testing point layout in the roof arch of the right bank workshop (from top)

    图  5  钻孔破坏(钻孔崩落、钻孔诱发张裂隙)现象展示图

    Figure  5.  Display diagram of the borehole failures (borehole breakouts and drilling-induced tensile fractures)

    图  6  钻孔崩落方位角玫瑰图

    a—钻孔CZZK 03; b—钻孔QXZK 03; c—钻孔CZZK 05; d—钻孔CZZK 07; e—钻孔CZZK 04; f—钻孔CZZK 08; g—钻孔CZZK 10

    Figure  6.  Rose diagram of the borehole breakout directions. (a) Borehole CZZK 03. (b) Borehole QXZK 03. (c) Borehole CZZK 05. (d) Borehole CZZK 07. (e) Borehole CZZK 04. (f) Borehole CZZK 08. (g) Borehole CZZK 10.

    图  7  钻孔崩落方位角分布散点图

    Figure  7.  Scatter diagram of the borehole breakout azimuths

    图  8  钻孔CZZK 05三个深度段的方位角玫瑰图

    a—0~10 m;b—10~20 m;c—20~26 m

    Figure  8.  Rose diagram of azimuth at three depths in the borehole CZZK 05

    图  9  钻孔CZZK 05的崩落分布散点图

    Figure  9.  Scatter diagram of the borehole breakout azimuths in the borehole CZZK 05

    图  10  钻孔CZZK 05钻孔崩落宽度分布直方图

    Figure  10.  Histogram of borehole breakout opening angles in the borehole CZZK 05

    图  11  钻孔诱发张裂隙分布散点图

    Figure  11.  Scatter diagram of the drilling-induced tensile fractures. (a) Borehole CZZK 03. (b) Borehole CZZK 05

    表  1  白鹤滩右岸厂房区域钻孔崩落最大水平主应力方向

    Table  1.   Direction of the maximum horizontal principal stress from the borehole breakouts in the area of the right bank cavern of the Baihetan hydroelectric power plant

    钻孔编号 崩落数目/个 数据采集范围/m 崩落总长度/m 平均SH方向/(°) 标准差/(°)
    CZZK 03 17 0~26.2 1.52 25 14.18
    QXZK 03 2 0~35.0 0.19 47 1.40
    CZZK 05 76 0~26.0 9.75 31 12.49
    CZZK 07 24 0~25.0 2.84 31 13.39
    CZZK 04 2 0~23.5 0.55 17 0.79
    CZZK 08 19 0~23.5 3.83 36 13.08
    CZZK 10 24 0~23.5 6.27 25 6.65
    下载: 导出CSV
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  • 刊出日期:  2021-06-28

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