The paper regards the main roof strata in uphill and downhill mining of an inclined longwall as a elastic plate.

 
  • 本文將傾斜長(cháng)壁仰斜、俯斜開(kāi)采的老頂巖層視為傾斜彈性板。當板的長(cháng)短跨度之比>2時(shí),板的荷載主要由短跨邊來(lái)承擔。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan