钢纤维煤矸石混凝土受压损伤声发射特性试验研究
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摘要
采用声发射技术,通过钢纤维掺量为0,0. 5%,1%,1. 5%的煤矸石混凝土单轴抗压试验,研究了钢纤维煤矸石混凝土受压损伤破坏与声发射特性参数之间的关系。依据声发射振铃计数,反演钢纤维煤矸石混凝土受压损伤全过程;根据钢纤维煤矸石混凝土受压释放的声发射能量定义损伤变量,建立损伤演化模型。研究表明:声发射特性参数与钢纤维煤矸石混凝土内部裂纹的形成、拓展和贯通有着密切的联系;依据钢纤维煤矸石混凝土受压声发射振铃计数,其破坏过程可近似概括为损伤累计,微裂缝发展,宏观裂缝发展3个阶段;依据声发射能量定义的损伤变量,建立的损伤演化模型,与试验数据符合较好,实现了用声发射特性参数,定量分析不同掺量钢纤维煤矸石混凝土的损伤。
In order to study the relationship between compressive damage and acoustic emission characteristics of steel fiber reinforced coal gangue concrete,this paper uses acoustic emission technology to study the effects of steel fiber content of 0,0. 5%,1% and 1. 5% coal gangue concrete shaft compression test. Based on the acoustic emission ring count,the whole process of steel fiber reinforced coal gangue concrete compressive damage is inversed. Based on the acoustic emission energy,the damage variable of steel fiber reinforced coal gangue concrete is defined,and the damage model of coal gangue concrete with different steel fiber content is established. The results show that the acoustic emission characteristic parameters are closely related to the formation,expansion and penetration of internal cracks of steel fiber reinforced coal gangue concrete. According to the ring count of the acoustic emission of steel fiber reinforced coal gangue concrete under pressure,the damage can be approximately summarized as three stages of damage accumulation,microcrack development and macroscopic crack development. The damage evolution model established based on the damage variables defined by acoustic emission energy is in good agreement with the experimental data. Which realizes the quantitative analysis of the damage of coal gangue concrete with different content of steel fibers by using acoustic emission characteristic parameters.
In order to study the relationship between compressive damage and acoustic emission characteristics of steel fiber reinforced coal gangue concrete,this paper uses acoustic emission technology to study the effects of steel fiber content of 0,0. 5%,1% and 1. 5% coal gangue concrete shaft compression test. Based on the acoustic emission ring count,the whole process of steel fiber reinforced coal gangue concrete compressive damage is inversed. Based on the acoustic emission energy,the damage variable of steel fiber reinforced coal gangue concrete is defined,and the damage model of coal gangue concrete with different steel fiber content is established. The results show that the acoustic emission characteristic parameters are closely related to the formation,expansion and penetration of internal cracks of steel fiber reinforced coal gangue concrete. According to the ring count of the acoustic emission of steel fiber reinforced coal gangue concrete under pressure,the damage can be approximately summarized as three stages of damage accumulation,microcrack development and macroscopic crack development. The damage evolution model established based on the damage variables defined by acoustic emission energy is in good agreement with the experimental data. Which realizes the quantitative analysis of the damage of coal gangue concrete with different content of steel fibers by using acoustic emission characteristic parameters.
引文
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[11]葛若东,刘茂军,吕海波.钢筋混凝土梁破坏过程的声发射特征试验研究[J].广西大学学报(自然科学版),2011,36(1):160-165.
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[14] Kachanov M,Tsukrov I,Shafiro B. Effective modulus of solids with cavities of various shapes[J]. Applied Mechanics Review,1994,47(1):S151-S174.
[2]孙丰英,徐卫东.煤矸石堆积区地下水污染效应研究[J].水资源与水工程学报,2006,17(5):56-57.
[3]张凯峰,吴雄,杨文.煤矸石建材资源化的研究进展[J].材料导报,2013(S1):290-293.
[4]郝亮,谭小蓉.煤矸石混凝土力学性能试验研究[J].中国煤炭,2016,42(11):116-121.
[5]邱继生,潘杜,关虓,等.冻融环境下煤矸石混凝土损伤演化规律研究[J].西安建筑科技大学学报(自然科学版),2017,49(5):654-658.
[6]邢军,周梅,张倩.热活化煤矸石矿物掺合料对混凝土抗渗和抗冻性能影响[J].硅酸盐通报,2015,34(9):2696-2701.
[7]周梅,朱涵,汪振双.钢纤维增强自燃煤矸石轻集料混凝土试验研究[J].建筑材料学报,2008,11(6):715-720.
[8]纪洪广,贾立宏,李造鼎.混凝土损伤的声发射模式研究[J].声学学报,1996(S1):601-608.
[9]胡少伟,陆俊,范向前.混凝土断裂试验中的声发射特性研究[J].水力发电学报,2011,30(6):16-19.
[10]邱继生,潘杜,关虓,等.冻融后煤矸石混凝土受压损伤声发射特性[J].建筑材料学报,2018,21(2):196-201.
[11]葛若东,刘茂军,吕海波.钢筋混凝土梁破坏过程的声发射特征试验研究[J].广西大学学报(自然科学版),2011,36(1):160-165.
[12]王明,李庶林.基于声发射速率过程理论的岩石声发射特性研究[J].厦门大学学报(自然科学版),2008,47(2):211-215.
[13] Kim B,Weiss W J. Using acoustic emission to quantify damage in restrained fiber-reinforced cement mortars[J]. Cement and Concrete Research,2003,33(2):207-214.
[14] Kachanov M,Tsukrov I,Shafiro B. Effective modulus of solids with cavities of various shapes[J]. Applied Mechanics Review,1994,47(1):S151-S174.