The loci of plastic hinge line and the maximum load during first roof weighting are determined by using kinematical method, and the minimum span of roof key stratum is derived.

　
英 美
  • 利用機動(dòng)法確定了老頂巖板初次來(lái)壓時(shí)載荷的上限值和塑鉸線(xiàn)的位置,得到了頂板巖體關(guān)鍵層的最小破斷跨距。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan