EXPERIMENTAL STUDY OF WATER PRESSURE RESISTANCE OF ADHESIVE WATERPROOF SHEETING AT CRACK OPENING OR JOINT EXPANSION REGION

Applying the chemical adhesive waterproof sheetings to tunnel as forward waterproof sheetings, these may not keep the performance when the fracture happened by crack-bridging tension at crack mouth opening or joint surcface expansion regions. To study this problem, the experiments have done that the observation of the deformation on chemical waterproof sheeting at crack opening region by using the tunnel lining model with chemical adhesive waterproof sheeting. Around 3mm of delaminated regions were observed in all specimens until 5mm of opening. Then there was lower crack-bridging tension than fracture. And chemical adhesive waterproof sheetings did not break in 5mm of crack opening under 1.5MPa of high water pressure.