摘要
单粒子冲击破岩与粒子冲击钻井的真实工况有一定的差异,因此,需要研究多粒子联合冲击破岩的规律。在双粒子联合冲击破岩条件下,利用LS-DYNA的参数化设计语言,采用无量纲化分析方法,选择粒子间距、直径、初速度和入射角度为设计变量,建立了它们与岩石破碎体积和侵入深度之间的关系,并绘制了它们之间的变化关系曲线图。进一步分析这些曲线图的变化规律后发现:间距为0.25个左右的基准直径、粒子直径取0.8~1个基准直径、冲击初速度取每秒32 000~40 000个基准直径、入射角度为0°~40°,粒子冲击破碎岩石效果达到最佳或接近最佳。这些结果可以作为深入研究多粒子联合冲击破岩的参考依据。
The rock breaking is different between single particle impacting and real particle impacting drilling.Therefore,it is urgent to study the laws of multi-particle impacting the breaking rock jointly.The space between double particle,the diameter,the initial velocity and the incident angle of particles are selected as design variables.The relationships between these variables and the volume of breaking rock and the invasion depth are established and drawn by means of parametric design language of LS-DYNA and dimensionless method under the condition of double particle impacting breaking rock.The analytical results show that the effect of particles impacting breaking rock will reach to or close to optimum when the space between the double particle is about 0.25 times of the datum diameter,the particle diameters are 0.8–1 times of datum diameter,the initial velocity is 32000–40000 times of datum diameter per second,and the incident angle is 0–40 degree.These results can be used as references for further researches of multi-particle impacting breaking rock.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第S1期19-23,共5页
Rock and Soil Mechanics
基金
国家自然科学基金项目(No.50874095)
四川省教育厅自然科学重点项目(No.07ZA142)
关键词
双粒子
无量纲
冲击破岩
LS-DYNA
钻井
double particle
dimensionless
impacting breaking rock
LS-DYNA
drilling
