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。
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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