英文篇名
APPLICATION OF STEEL FIBER REINFORCED SHOTCRETE FOR UNDERGROUND STRUCTURES
作者
陳怡名、劉弘祥、張吉佐
關鍵字
鋼纖維噴凝土、抗張強度、撓曲強度、延展性、矽灰、強塑劑
摘要
自從1980年以來鋼纖維噴凝土已逐漸被使用於台灣不同結構物上,諸如地下結構物、橋面板及機場跑道等。其中在地下結構物方面,鋼纖維噴凝土目前已逐漸替代鋼線網噴凝土。鋼纖維噴凝土比鋼線網噴凝土具有較高抗張強度、撓曲強度及延展性。因此,鋼纖維噴凝土較易抵擋由岩盤荷重產生之張應力。在新奧工法施工過程,鋼纖維噴凝土比鋼線網噴凝土更易覆蓋隧道開挖面。尤其使用鋼纖維噴凝土之優點為可免除掛置鋼線網。本文簡要說明鋼纖維噴凝土之配比設計、材料規範、噴裝過程、例舉國內之案例及實際應用之檢討與建議。
英文摘要
Since 1980, steel fiber reinforced concrete (SFRC) has been used in various structures in Taiwan, Such as underground structures, slab of bridges and airport runways, etc. Among these, steel fiber reinforced shotcrete (SFRS) is now widely applied to caven and tunnel excavations mostly by shotcrete with New Austrian Tunneling Method (NATM). SFRS has higher tensile strength, flexural strength and ductility as compared with normal shotcrete, and it is easy for SFRS to resist any tensile stress induced by rock load. In case of NATM, it is better to cover excavated tunnel surface with ductile SFRS than normal shotcrete, it is beneficial to use SFRS to avoid placement of reinforcing bars. This paper illustrates briefly the mix design, material specification , application procedures and presents the cases history in Taiwan.
KEY WORDS:steel fiber reinferced shotcrete, tensil strength, flexural strength, ductility, silica fume, superplasticizer.