高压电脉冲水压致裂煤体效果试验研究

发布时间：2018-08-25 07:28

【摘要】：为了研究高压电脉冲水压对煤体产生裂缝的作用效果,制作了力学特征接近真实煤层的煤样试件,试验前首先在原煤试件中钻取煤样,利用CT进行扫描观察原煤试件中的裂缝分布情况,然后在实验室三轴刚性压力室内进行水中高压脉冲放电,试验完成后再次进行CT切片扫描,对比相同水压条件下高静水压力和高压电脉冲水压对煤样产生裂缝的效果。研究发现:原煤试件取样完整,无振动和破坏,无明显的原生裂隙分布;在3 MPa静水压力作用下,煤样钻孔及周边并未产生新的裂隙;而在3 MPa静水压力+10 k V高压放电的情况下,煤样钻孔及周边有一些长短不一、形状各异的新生裂隙产生,证明了相同水压条件下高压电脉冲对煤层致裂增透效果优于单纯静水压。
[Abstract]:In order to study the effect of high pressure electric pulse water pressure on cracking of coal body, coal samples with mechanical characteristics close to real coal seam were made. Before the test, coal samples were drilled from raw coal samples. CT was used to scan and observe the distribution of cracks in raw coal samples, and then high pressure pulse discharge in water was carried out in the laboratory triaxial rigid pressure chamber. After the test was completed, CT slices were scanned again. The effects of high hydrostatic pressure and high pressure electric pulse water pressure on the fracture of coal samples are compared. It is found that the sample of raw coal is intact, no vibration and damage, no obvious distribution of primary fractures, and no new fractures in and around the boreholes of coal samples under 3 MPa hydrostatic pressure. However, under the condition of 10 kV high pressure discharge at 3 MPa hydrostatic pressure, there are some new cracks of different shapes and different lengths in and around the boreholes of coal samples. It is proved that the antireflection effect of high voltage electric pulse is better than that of hydrostatic pressure under the same water pressure.
【作者单位】：太原理工大学矿业工程学院;内蒙古科技大学土木工程学院;中北大学理学院;
【基金】：国家自然科学基金青年科学基金资助项目(51504220) 山西省煤层气联合研究基金资助项目(2012012012) 内蒙古自然科学基金资助项目(2016MS0511)
【分类号】：TD712.6

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