... blast resistant structure 防爆构筑物 blast safety distance 爆破安全距离 blast shield 防爆屏蔽 ...
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In general, as the distance between double line tunnel and existing tunnel is very small, excavating blast in double line tunnel will affect structure safety of existing tunnel.
复线隧道与既有隧道的净间距一般都较小,因此,施工爆破对既有隧道会有较大的影响。
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