CAJ | 학술논문

为了开发脉冲等离子体钻机，开展了高压短脉冲作用下岩石击穿的实验研究。以去离子水为工作介质，将不同种类和不同厚度的岩石放置于尖板电极间，通过加载不同大小的电压于岩石上，考察了岩石的电击穿概率与平均电场强度的关系。实验结果发现：7％空隙率的黄砂岩电击穿场强为70kV／cm；0．8％空隙率的白大理岩电击穿场强为160kV／cm。岩石孔隙率的大小对电击穿场强影响显著，孔隙率越大，电击穿场强越小。岩石厚度对电击穿场强也有一定影响，电击穿场强随厚度增加而减少。
위료개발맥충등리자체찬궤，개전료고압단맥충작용하암석격천적실험연구。이거리자수위공작개질，장불동충류화불동후도적암석방치우첨판전겁간，통과가재불동대소적전압우암석상，고찰료암석적전격천개솔여평균전장강도적관계。실험결과발현：7％공극솔적황사암전격천장강위70kV／cm；0．8％공극솔적백대리암전격천장강위160kV／cm。암석공극솔적대소대전격천장강영향현저，공극솔월대，전격천장강월소。암석후도대전격천장강야유일정영향，전격천장강수후도증가이감소。
In order to develop an efficient plasma drill, we experimentally researched rock breakdown under short high-voltage pulses in deionized water. Rocks were placed between a needle high-voltage electrode and a plate grounded electrode. The relationship .between breakdown probability and electrical strength was evaluated by applying various voltage levels to the rocks. The results show that the electrical breakdown strength of yellow sandstone with 7% porosity is 70 kV/cm, and for white marble with 0.8~ porosity it is 160 kV/cm. The porosity has a great influence on the breakdown strength. Moreover, experimental results show that the breakdown strength drops with increasing thickness of the rock.