The bore sequence of every working face is random to the multi joint rock drilling manipulator, so the bore task planning is very complicated.

多关节凿岩机械手在工作时，完成的是一个在一定工作面上随机的钻孔孔序任务，其孔序规划相当复杂。

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It's known that the discrete element method well considers the discontinuity character of rock mass, and can be used to analyze the joint rock mass.

而离散元法正是充分考虑到岩体结构的不连续性，适用于解决节理岩石力学问题。

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Moreover some random factors of orientation and friction Angle of structural surface are considered during the stability analysis of joint rock mass.

在节理岩体的稳定性分析中，考虑了各组结构面产状和摩擦角的随机性。

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They transformed the little stancible juke joint rhythm into a ponderous rock beat aimed at seated crowds and reverberant staves.

NPR: Blues Song Is a Decades-Long Music Lesson