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        1. 10
          2019
          09

          隧道工程中逃生管道應該設置多少米合適

          超高分子量聚乙烯隧道逃生管道(分子量約為250萬),規格為Φ800*30其主要參數取值為:屈服強度σ1=3.7GPa,彈性模 量:E1=700MPa;泊松比ν1=0.42; 密度:ρ1=950kg/m3。沖擊試件為塊狀花崗巖,初步選定巖塊直徑為0.67m,巖體參數取值 為:彈性模量 E2=40GPa, 泊松比ν2=0.2 ,密度ρ2=2500kg/m3。 巖塊重量 W=611kg。   ①超高分子量聚乙烯隧道逃生管道所用管材采用Φ800mm的超高分子量聚乙烯管道,管
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          嫩草在线_日韩专区在线观看_制服丝袜在线_午夜不卡伦在线观看
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