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。
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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