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差应变法地应力测量——以汶川地震断裂带科学钻探WFSD-1钻孔为例

彭华 马秀敏 姜景捷

彭华, 马秀敏, 姜景捷, 2011. 差应变法地应力测量——以汶川地震断裂带科学钻探WFSD-1钻孔为例. 地质力学学报, 17 (3): 249-261.
引用本文: 彭华, 马秀敏, 姜景捷, 2011. 差应变法地应力测量——以汶川地震断裂带科学钻探WFSD-1钻孔为例. 地质力学学报, 17 (3): 249-261.
PENG Hua, MA Xiu-min, JIANG Jing-jie, 2011. IN-SITU STRESS MEASUREMENT BY DIFFERENTIAL STRAIN ANALYSIS METHOD IN WFSD-1. Journal of Geomechanics, 17 (3): 249-261.
Citation: PENG Hua, MA Xiu-min, JIANG Jing-jie, 2011. IN-SITU STRESS MEASUREMENT BY DIFFERENTIAL STRAIN ANALYSIS METHOD IN WFSD-1. Journal of Geomechanics, 17 (3): 249-261.

差应变法地应力测量——以汶川地震断裂带科学钻探WFSD-1钻孔为例

基金项目: 

科技部“汶川地震断裂带科学钻探”项目和地调项目 1212010916064

详细信息
    作者简介:

    彭华(1964-),男,研究员,主要从事地应力测量及相关测量仪器研制、地壳稳定性调查与评价、地质灾害、岩稳定性和岩石力学与工程施工等方面的研究工作。E-mail:ph68486797@yahoo.com.cn

  • 中图分类号: P315

IN-SITU STRESS MEASUREMENT BY DIFFERENTIAL STRAIN ANALYSIS METHOD IN WFSD-1

  • 摘要: 岩心差应变分析法是汶川地震断层科学钻探(WFSD)项目地应力测量的主要手段之一, 该技术通过高压容器对取之于钻孔不同深度的实验样品施加围压, 观察先前由于失去地层应力而膨胀产生的裂纹重新闭合, 并通过裂纹闭合过程差应变曲线分析, 确定主应力大小和方向。WFSD-1孔12个岩心样品的DSA测试结果表明:断层上下盘的应力状态有明显差异, 区域地应力不仅随深度增加, 还与地质结构和岩石的物理性质等因素有关。

     

  • 图  1  岩心应力释放卸载产生的微裂隙及其分布示意图

    Figure  1.  Distribution and generated micro-cracks by the unloading of core stress

    图  2  岩石受压微裂纹闭合过程围压-应变曲线

    Figure  2.  Pressure-strain curve of confining pressure rock during micro-crack closure

    图  3  WFSD-1钻孔示意图及采样位置

    Figure  3.  Diagram of WFSD-1 drilling hole and sampling location

    图  4  DSA试验岩心试件贴片方式

    Figure  4.  Chip mode of core in DSA examination

    图  5  贴12个应变片的DSA试样

    Figure  5.  Specimen in the confining pressure chamber

    图  6  熔凝石英补偿块

    Figure  6.  Compensation block of the fused quartz

    图  7  试验高压容器

    Figure  7.  Diagram of the high pressure vessel

    图  8  数字应变仪记录的用标样作为桥臂的实验过程的围压-应变(ε(p))曲线(原始数据)

    Figure  8.  Recorded pressure-strain curves by a digital gauge during experiment (raw data)

    图  9  压力闭合点pc补偿弹性模量后的差应变η(pc)曲线(WFSD-1-B6砂岩试样,深度1190 m)

    Figure  9.  Different strain curve after the compensated elastic modulus by pressure closing point

    图  10  差应变数据η(pc)对p求导后的曲线

    Figure  10.  The obtained curve of derivative difference strain data on pc

    图  11  部分试样围压下裂缝闭合过程主差主应变轴极密图

    Figure  11.  The pole dense of principal strain axis during fracture closure under confining pressure difference

    图  12  WFSD-1钻孔应力随深度变化曲线

    Figure  12.  Stress curve with depth in WFSD-1 borehole

    表  1  差应变法应变椭球主应变轴比率

    Table  1.   Ratio of strain ellipsoid principal strain axes in DSA

    表  2  WFSD-1井差应变法地应力测量结果比较

    Table  2.   The compared results of DSA stress measurement in WFSD-1 hole

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出版历程
  • 收稿日期:  2011-05-30
  • 刊出日期:  2011-09-01

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