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挪威Haugesund地区三条海底隧道掘进中,部分地段通过岩层为含膨胀粘土质的绿泥岩。布置58～62个直径45毫米的炮孔,另加三个直径100毫米的切割孔,孔深均为2.5米。凿岩设备是一台Atlas Copco H·170-3臂液压台车,出碴用11.5米~3卡车。爆破后用一个小时进行初期喷护作业(实际喷半小时,其余半小时为进出车辆)。出碴后再用一个小时进行第二次喷护,然后,立即浇注混凝土衬砌。衬砌部分只有不太长的地段,大部分地段采用钢纤维增强混凝土支护。 钢纤维增强混凝土有三种重要成分:微粒硅石、钢纤维、附加剂。微粒硅石具有改善混凝土强度和耐久性的性质。自1978年以
In the three submarine tunnelling tunnels in the Haugesund area of Norway, some of the sections pass through the green mudstones with swelling clays. 58 to 62 45 mm diameter blast holes were placed, plus three 100 mm diameter cutting holes with a depth of 2.5 m. The rock drilling equipment is an Atlas Copco H.170-3 arm hydraulic truck with 11.5 meters to 3 trucks. One hour after blasting, the initial spray protection operation (actual spray for half an hour, the remaining half an hour for access to the vehicle). After the pumping, the second spraying was performed for one hour, and then the concrete lining was immediately poured. The lining part is only a section that is not too long, and steel fiber reinforced concrete supports are used in most locations. Steel fiber reinforced concrete has three important components: particulate silica, steel fibers, and additives. Fine-grained silica has the property of improving the strength and durability of concrete. Since 1978