By taking the on-site monitoring and research as a tool, the influence of coal mining, coal pillar size and underwater on the roof stability of coal roadways is analyzed.
阐述了哈拉沟煤矿主采煤层顶板的赋存特征，以现场监测、现场调研为手段，分析了煤层开采、护巷煤柱尺寸及地下水对煤巷顶板稳定性的影响，为今后煤巷顶板稳定性分类及合理支护提供依据。
In detail explained tool machine to sign pillar again later on, slippery pedestal with slippery the saddle design of concrete process.
随后又详细地说明了机床立柱、滑台和滑鞍设计的具体过程。
This approach is applied to the pillar optimal design in XH6650 high speed machine center. The dynamic property of machine tool is improved with this method.
将该方法应用到XH6650高速加工中心的立柱结构优化中，从而提高了机床的整机动态特性。
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