煤岩体在水中高压放电下致裂效果的定量评价#br#

doi:10.13722/j.cnki.jrme.2019.0692

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摘要为了研究水中高压放电对低渗透性煤体的致裂效果，设计在3 MPa水压中高压脉冲放电压裂试验，利用CT扫描系统和孔裂隙特征分析软件，通过研究煤样内部裂隙的几何形态参数、分形维数及裂隙宽度概率密度函数的变化，定量分析煤岩体在不同加载压裂方式下的裂纹扩展规律。研究结果表明：在相同水压条件下，高压电脉冲水压压裂煤体的效果明显优于单纯3 MPa水压的压裂效果；放电电压越高，煤样内部裂隙的数量和节点数量越多、总长度越长、平均宽度越宽以及裂隙率越大；放电电压越高，分形维数和裂隙分布初值的对数值越大，即裂隙越复杂，大裂隙所占比例越大；放电电压越高，裂隙宽度越宽，宽度分布范围也越广。由此可见，水中高压脉冲放电对煤体具有良好的致裂效果。

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	鲍先凯1
	刘源1
	郭军宇1
	曹嘉星1
	赵金昌2
	武晋文3

关键词 ：采矿工程, 裂隙, 几何形态参数, 分形维数, 概率密度函数, 定量分析

Abstract：

To study the fracturing effect of high-voltage discharge in water on coal-rock masses with low permeability，the fracturing test of high-voltage pulse discharge in 3MPa drilling hydraulic water was designed, and the crack expansion law of coal-rock masses under different loading fracturing conditions was quantitatively analyzed by using computed tomography(CT) scanning system and the fracture characteristic analysis software to study the geometry parameters and fractal dimension of internal cracks and the variation of probability density function of crack width of coal samples. It is shown from the test results that under the same hydraulic pressure，the effect of hydraulic fracturing of high-voltage electrical pulse on coal-rock masses is superior to that of pure 3 MPa hydraulic pressure. The higher the discharge voltage，the more the number of cracks and nodes inside the coal sample，the longer the total length，the wider the average width and the higher the cracking rate. The higher the discharge voltage，the larger the fractal dimension and the logarithm of the crack distribution initial value，that is，the more complex the cracks and the greater the proportion of macro-cracks. The higher the discharge voltage，the wider the crack width and its distribution range. It can be seen that the high pressure pulse discharge in water has good fracturing effect on coal-rock masses.

Key words： mining engineering crack geometrical parameter fractal dimension probability density function quantitative analysis

引用本文:

鲍先凯1，刘源1，郭军宇1，曹嘉星1，赵金昌2，武晋文3. 煤岩体在水中高压放电下致裂效果的定量评价#br#[J]. 岩石力学与工程学报, 2020, 39(4): 715-725.
BAO Xiankai1，LIU Yuan1，GUO Junyu1，CAO Jiaxing1，ZHAO Jinchang2，WU Jinwen3. Quantitative evaluation of fracturing effect of coal-rock masses under high-voltage discharge actions in water#br#. , 2020, 39(4): 715-725.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0692 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I4/715

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