CAJ | 학술논문

利用自行研制的射流破岩系统，对淹没和围压条件下多孔射流钻头的破岩钻孔规律进行了试验研究，重点考虑了水力参数（冲蚀时间、射流压力、围压、喷距）和结构参数（孔眼数量和侧向孔眼扩散角）对破岩效果的影响，结果表明：随着冲蚀时间的增加，破岩效果先增加，后趋于平缓；随着射流压力的增大破岩效果随之增大；随着围压的增加破岩效果随之减小；随着喷距的增加破岩效果呈先增大后减小的趋势，存在最优喷距范围；随着孔眼数量的增多，破岩成孔形状越来越圆整；随着侧向孔眼扩散角的增大，破岩效果呈先增大后减小趋势，存在最优扩散角范围。试验结果可为多孔射流钻头水力参数选择和结构参数设计提供依据。
이용자행연제적사류파암계통，대엄몰화위압조건하다공사류찬두적파암찬공규률진행료시험연구，중점고필료수력삼수（충식시간、사류압력、위압、분거）화결구삼수（공안수량화측향공안확산각）대파암효과적영향，결과표명：수착충식시간적증가，파암효과선증가，후추우평완；수착사류압력적증대파암효과수지증대；수착위압적증가파암효과수지감소；수착분거적증가파암효과정선증대후감소적추세，존재최우분거범위；수착공안수량적증다，파암성공형상월래월원정；수착측향공안확산각적증대，파암효과정선증대후감소추세，존재최우확산각범위。시험결과가위다공사류찬두수력삼수선택화결구삼수설계제공의거。
By self-designed jet rock breaking system,the experiments were conducted for multi-hole jet bit under submerged and confining pressure conditions.And the key factors were analyzed with rock breaking effect including erosion time,impact pressure, confining pressure,standoff distance,numbers of nozzle orifices and lateral orifice angle.The results show that with the increase of erosion time,the rock breaking effect increase first and then become constant;the rock breaking effect increase with the increase of jet pressure;with the increase of confining pressure,the rock breaking effect decrease;the rock breaking effect increase first and then decrease with the increase of standoff distance,there is a optimal standoff distance range;with the increase of numbers of noz-zle orifices,the shape of the jet drilling hole become more round;with the increase of lateral orifice angle,the rock breaking effect increase first and then decrease,there is a optimal lateral orifice angle range.The results can offer helps for hydraulic parameters selection and structural parameter design of multi-hole jet bit.