... tunnel-drainage board, drainage board) which is consisted with plastic net and per-meated geotextile both sides, can instead of traditional ... and the inside of the tunnel. Three-D Drainage Net Technical Data Technical Data experimental technique units Type JRTD1JRTD2i=1 ... 90a,b,c,d,e(KN/m)Tensile StrengthISO10319KN/m28.030.0a,b,eExtensibilityISO10319%6060a,b,eDrainage Net physical property of ...