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凈间距一般都较小,因此,施工爆破对既有隧道会有较大的影响。
water flow can affect structure of the community and species distribution, as well as the production, metabolic processes and morphological characteristics of macrophytes.