摘要
依托塞尔维亚E763高速公路Laz隧道工程,通过抗压强度和劈裂抗拉强度试验,对喷射纤维混凝土复合衬砌的力学性质进行了研究,研究结果表明:在喷射纤维混凝土龄期为28d条件下,当聚丙烯纤维掺量为0.11%,钢纤维掺量为1.05%时,相比其他喷射纤维混凝土,其抗压强度和劈裂抗拉强度均最大;在喷射纤维混凝土龄期为28d条件下,当聚丙烯纤维掺量为0.11%,钢纤维掺量为1.05%时,喷射纤维混凝土的拉压比为0.105,相比未掺入纤维的喷射混凝土,拉压比增大了31.25%;在聚丙烯纤维和钢纤维组合掺量下,当聚丙烯纤维掺量为0.11%,钢纤维掺量为1.05%时,相比其他喷射纤维混凝土,喷射纤维混凝土受到的峰值应力最大,最大为56MPa,相应应变为0.023;在本次隧道工程中,当喷射混凝土掺入0.11%聚丙烯纤维掺量和1.05%钢纤维时,可大幅度提高喷射纤维混凝土的抗压强度和劈裂抗拉强度。
Based on the Laz tunnel project of E763 expressway in Serbia,the mechanical properties of sprayed fiber concrete composite lining were studied by compressive strength and splitting tensile strength tests.The results show that when the age of sprayed fiber concrete is 28d,when the dosage of polypropylene fiber is 0.11%and the dosage of steel fiber is 1.05%,the compressive strength and splitting tensile strength are the largest compared with other sprayed fiber concrete.Under the condition that the age of sprayed fiber concrete is 28d,when the dosage of polypropylene fiber is 0.11%and the dosage of steel fiber is 1.05%,the tension-compression ratio of sprayed fiber concrete is 0.105,which is 31.25%higher than that of sprayed concrete without fiber.Under the combined content of polypropylene fiber and steel fiber,when the dosage of polypropylene fiber is 0.11%and the dosage of steel fiber is 1.05%,compared with other sprayed fiber concrete,the peak stress of sprayed fiber concrete is the largest,the maximum is 56MPa,and the corresponding strain is 0.023.In this tunnel project,when the shotcrete is mixed with 0.11%polypropylene fiber dosage and 1.05%steel fiber,the compressive strength and splitting tensile strength of the shotcrete can be greatly improved.
作者
韦永华
杨林林
程东波
任裕廷
WEI Yonghua;YANG Linlin;CHENG Dongbo;REN Yuting(CCCC Second Highway Engineering Co.,Ltd.,Xi’an,Shaanxi 710065,China)
出处
《施工技术(中英文)》
2025年第10期133-139,共7页
Construction Technology
基金
陕西省自然科学基金(TTS-023)。
关键词
混凝土
喷射纤维
聚丙烯纤维
钢纤维
抗压强度
劈裂抗拉强度
concrete
spray fiber
polypropylene fiber
steel fiber
compressive strength
splitting tensile strength
