喷射混凝土力学性能试验研究及预测模型建立
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摘要
以喷射混凝土单层永久衬砌隧道为背景,采用干喷大板法,开展喷射混凝土力学性能试验。以宝鸡至兰州高速铁路麦积山隧道衬砌喷射混凝土配合比为基础,考虑水胶比、粉煤灰和钢纤维影响,研究喷射混凝土抗压强度和劈裂抗拉强度经时变化规律,建立相应的预测模型。结果表明:喷射混凝土早龄期强度较高。随着龄期增大,同配合比模筑混凝土强度增大并超过喷射混凝土,且二者差值逐渐增大。水胶比增大及钢纤维掺量减小,喷射混凝土强度减小;随粉煤灰掺量增大,强度先增大后减小。采用13组数据对抗压强度模型进行验证,其相对偏差的标准差为5. 55,说明模型具有较好的适用性。喷射混凝土抗压强度和劈裂抗拉强度均呈正态分布,且二者之间呈指数关系。
As background of shotcrete single layer lining tunnel,mechanical properties of shotcrete were investigated by using dry-mix method. Based on the shotcrete mixture of Maijishan Mountain tunnel on high-speed railway from Baoji to Lanzhou,the time-dependent of compressive and splitting tensile strength were studied in term of water-binder ratio,dosage of fly ash and steel fiber content. After that,the strength prediction model of compressive and splitting tensile strength were established. The results show that shotcrete has higher strength at early hydration age. With curing age increased,the strength of formed concrete is over shotcrete and the difference also increases. The strength increases with w/b increased and steel fiber content decreased,and that is first increased and then decreased with dosage of fly ash increased. Compressive and splitting tensile strength are obey normal distribution. Moreover,there has exponential distribution between compressive strength and splitting tensile strength.
As background of shotcrete single layer lining tunnel,mechanical properties of shotcrete were investigated by using dry-mix method. Based on the shotcrete mixture of Maijishan Mountain tunnel on high-speed railway from Baoji to Lanzhou,the time-dependent of compressive and splitting tensile strength were studied in term of water-binder ratio,dosage of fly ash and steel fiber content. After that,the strength prediction model of compressive and splitting tensile strength were established. The results show that shotcrete has higher strength at early hydration age. With curing age increased,the strength of formed concrete is over shotcrete and the difference also increases. The strength increases with w/b increased and steel fiber content decreased,and that is first increased and then decreased with dosage of fly ash increased. Compressive and splitting tensile strength are obey normal distribution. Moreover,there has exponential distribution between compressive strength and splitting tensile strength.
引文
[1] Thomas A. Sprayed concrete lined tunnel[M]. New York:Taylor&Francis,2012:9.
[2] Hemphill G B. Practical tunnel construction[M]. Hoboken:Jone Wiley&Sons,2013:309-322
[3] Christopher K Y L,Raymond L,Augustus Y F L. Properties of wet-mixed fiber reinforced shotcrete and fiber reinforced concrete with similar composition[J]. Cement and Concrete Research,2005(35):788-795.
[4]李伏虎,马芹永. D型速凝剂对喷射混凝土微观结构和力学性能的影响[J].硅酸盐通报,2017,36(2):602-606.
[5] Maryam K,Javad T. Experimental and mechanical performance of shotcrete made with nanomaterials and fiber reinforcement[J]. Construction and Building Materials,2018,165:199-205.
[6]朱伶俐,赵宇.偏高岭土提高喷射混凝土性能的实验研究[J].硅酸盐通报,2014,33(5):1169-1173.
[7]张亚梅,孙伟,王亚丽,等.硅灰和钢纤维对喷射混凝土性能的影响研究[J].混凝土与水泥制品,2002(3):33-35.
[8]欧阳幼玲,陈迅捷,陆采荣,等.钢纤维和仿钢纤维喷射混凝土性能[J].东南大学学报(自然科学版),2010,40(s2):44-48.
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[12] EN 14488-2-2006. Testing sprayed concrete. Part 2:compressive strength of young sprayed concrete[S]. European Union,2006.
[13] GB/T 50081-2002.普通混凝土力学性能试验方法标准[S].北京:中国建筑工业出版社,2002.
[14] Niu D T,Wang J B,Wang Y. Effect of hydration aging and water binder ratio on microstructure and mechanical properties of sprayed concrete[J].Journal of Wuhan University of Technology-Mater. Sci. Ed.,2015,30(4):745-751.
[15]马孟强.水泥砂浆混凝土硬化强度与龄期关系[J].土木工程学报,1957(2):3-19.
[16] Hedegaard S E,Hansen T C. Modified water/cement ratio law for compressive strength of fly ash concretes[J]. Materials and Structures,1992,25(5):273-283.
[17]杨静,李晗,杨林.钢纤维纳米矿粉混凝土凝结时间与强度研究[J].混凝土,2015(8):66-70.
[18]王蒂,廖卫东,刘强.喷射混凝土性能和配合比的试验研究[J].武汉理工大学学报,2003,25(12):53-55.
[19]赵喜忠.隧道喷射混凝土抗冻耐久性试验研究[D].西安:长安大学,2011.
[20]胡建立.钢纤维喷射混凝土试验研究及应用[J].四川水力发电,2004,23(4):85-86.
[21]郭维民,郭文康,石正国,等.钢纤维对喷射混凝土物理力学性能的影响[J].水力发电,2015(1):87-90.
[22]王志杰,孟祥磊.钢纤维混凝土基本力学性能研究[J].混凝土,2014(4):78-81.
[23] Yusuf I T,Jimoh Y A,Salami W A. An appropriate relationship between flexural strength and compressive strength of palm kernel shell concrete[J]. Alexandria Engineering Journal,2016,55(2):1553-1562.
[2] Hemphill G B. Practical tunnel construction[M]. Hoboken:Jone Wiley&Sons,2013:309-322
[3] Christopher K Y L,Raymond L,Augustus Y F L. Properties of wet-mixed fiber reinforced shotcrete and fiber reinforced concrete with similar composition[J]. Cement and Concrete Research,2005(35):788-795.
[4]李伏虎,马芹永. D型速凝剂对喷射混凝土微观结构和力学性能的影响[J].硅酸盐通报,2017,36(2):602-606.
[5] Maryam K,Javad T. Experimental and mechanical performance of shotcrete made with nanomaterials and fiber reinforcement[J]. Construction and Building Materials,2018,165:199-205.
[6]朱伶俐,赵宇.偏高岭土提高喷射混凝土性能的实验研究[J].硅酸盐通报,2014,33(5):1169-1173.
[7]张亚梅,孙伟,王亚丽,等.硅灰和钢纤维对喷射混凝土性能的影响研究[J].混凝土与水泥制品,2002(3):33-35.
[8]欧阳幼玲,陈迅捷,陆采荣,等.钢纤维和仿钢纤维喷射混凝土性能[J].东南大学学报(自然科学版),2010,40(s2):44-48.
[9]杨健辉,李燕飞,丁鹏,等.混杂纤维喷射混凝土的力学性能试验研究[J].工业建筑,2013,43(8):101-105.
[10] Bernard E S. Age-dependent changes in post-crack performance of fibre reinforced shotcrete linings[J]. Tunnelling&Underground Space Technology Incorporating Trenchless Technology Research,2015,49:241-248.
[11] Saw H,Villaescusa E,Windsor C R,et al. Laboratory testing of steel fibre reinforced shotcrete[J]. International Journal of Rock Mechanics&Mining Sciences,2013,57(1):167-171.
[12] EN 14488-2-2006. Testing sprayed concrete. Part 2:compressive strength of young sprayed concrete[S]. European Union,2006.
[13] GB/T 50081-2002.普通混凝土力学性能试验方法标准[S].北京:中国建筑工业出版社,2002.
[14] Niu D T,Wang J B,Wang Y. Effect of hydration aging and water binder ratio on microstructure and mechanical properties of sprayed concrete[J].Journal of Wuhan University of Technology-Mater. Sci. Ed.,2015,30(4):745-751.
[15]马孟强.水泥砂浆混凝土硬化强度与龄期关系[J].土木工程学报,1957(2):3-19.
[16] Hedegaard S E,Hansen T C. Modified water/cement ratio law for compressive strength of fly ash concretes[J]. Materials and Structures,1992,25(5):273-283.
[17]杨静,李晗,杨林.钢纤维纳米矿粉混凝土凝结时间与强度研究[J].混凝土,2015(8):66-70.
[18]王蒂,廖卫东,刘强.喷射混凝土性能和配合比的试验研究[J].武汉理工大学学报,2003,25(12):53-55.
[19]赵喜忠.隧道喷射混凝土抗冻耐久性试验研究[D].西安:长安大学,2011.
[20]胡建立.钢纤维喷射混凝土试验研究及应用[J].四川水力发电,2004,23(4):85-86.
[21]郭维民,郭文康,石正国,等.钢纤维对喷射混凝土物理力学性能的影响[J].水力发电,2015(1):87-90.
[22]王志杰,孟祥磊.钢纤维混凝土基本力学性能研究[J].混凝土,2014(4):78-81.
[23] Yusuf I T,Jimoh Y A,Salami W A. An appropriate relationship between flexural strength and compressive strength of palm kernel shell concrete[J]. Alexandria Engineering Journal,2016,55(2):1553-1562.