新浇混凝土爆破振动损伤累积规律模拟试验研究
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摘要
针对新浇混凝土振动损伤累积问题,利用振动试验系统开展了新浇混凝土爆破振动损伤累积模拟试验,并进行了受振混凝土强度与耐久性检测试验。结果表明:新浇混凝土振动损伤值累积过程可分为降低、快速增长和基本稳定3个阶段,且累积损伤值随着振动速度的增大而增大。振动速度v≤1. 0 cm/s时,超声波波速发展经历快速增长、缓慢增长和稳定3个阶段,最大波速随振动速度的增大而增大,振动损伤劣化效应不显现,混凝土的强度和耐久性提高。振动速度v≥1. 5 cm/s时,超声波波速发展出现损伤劣化降低过程而呈现为4个阶段,峰值波速和稳定波速均低于基准试块的相应波速,且都随着振动速度的增大而减小;振动损伤劣化效应从第2阶段开始显现,并在第3阶段宏观显现,振动速度达到3. 5 cm/s时,损伤从第1阶段即宏观显现;混凝土的强度和耐久性降低,且高强混凝土损伤劣化程度较普通混凝土明显。试验条件下新浇混凝土安全振动速度应控制在1. 5 cm/s以下,龄期12 h以前,振动速度不宜超过2. 0 cm/s。
To address the blasting vibration induced damage accumulation of new concrete,a test on blasting vi-bration induced damage accumulation of new concrete was carried out by the vibration test system,and the test of strength and durability of vibrated concrete was also carried out. The experimental results show that the blasting vibration induced damage accumulation has experienced three stages including the reduction stage,rapid growth stage and stability stage,and the cumulative damage value increases with the increase of vibration velocity.When the vibration velocity is less than 1. 0 cm/s,the development of ultrasonic wave velocity has experienced three stages including the rapid growth stage,slow growth stage and stability stage,the maximum ultrasonic wave velocity increases with the increase of vibration velocity,the damage deterioration effect of vibration loads does not appear,and the vibration loads can improve the compressive strength and durability of the concrete.However,when the vibration velocity is greater than 1. 5 cm/s,the development of ultrasonic wave velocity has experienced four stages because of the appearance of damage deterioration and reduction process,both the peak and steady ultrasonic wave velocity are lower than the corresponding wave velocity of thevirgin specimens,and both decrease with the increase of the vibration velocity,the damage deterioration effect of vibration loads begins to appear in the second stage and appear macroscopically in the third stage,when the vibration velocity reaches 3. 5 cm/s,the damage deterioration effect appears from the first stage.The compressive strength and durability of concrete are decreased,and the damage deterioration degree of high strength concrete is more obvious than that of ordinary concrete.Under the test conditions,the safety vibration velocity of new concrete should be controlled below 1. 5 cm/s,and the vibration velocity should not exceed 2. 0 cm/s before the age of 12 h.
To address the blasting vibration induced damage accumulation of new concrete,a test on blasting vi-bration induced damage accumulation of new concrete was carried out by the vibration test system,and the test of strength and durability of vibrated concrete was also carried out. The experimental results show that the blasting vibration induced damage accumulation has experienced three stages including the reduction stage,rapid growth stage and stability stage,and the cumulative damage value increases with the increase of vibration velocity.When the vibration velocity is less than 1. 0 cm/s,the development of ultrasonic wave velocity has experienced three stages including the rapid growth stage,slow growth stage and stability stage,the maximum ultrasonic wave velocity increases with the increase of vibration velocity,the damage deterioration effect of vibration loads does not appear,and the vibration loads can improve the compressive strength and durability of the concrete.However,when the vibration velocity is greater than 1. 5 cm/s,the development of ultrasonic wave velocity has experienced four stages because of the appearance of damage deterioration and reduction process,both the peak and steady ultrasonic wave velocity are lower than the corresponding wave velocity of thevirgin specimens,and both decrease with the increase of the vibration velocity,the damage deterioration effect of vibration loads begins to appear in the second stage and appear macroscopically in the third stage,when the vibration velocity reaches 3. 5 cm/s,the damage deterioration effect appears from the first stage.The compressive strength and durability of concrete are decreased,and the damage deterioration degree of high strength concrete is more obvious than that of ordinary concrete.Under the test conditions,the safety vibration velocity of new concrete should be controlled below 1. 5 cm/s,and the vibration velocity should not exceed 2. 0 cm/s before the age of 12 h.
引文
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[16]褚怀保,杨小林,梁为民,等.煤体爆破作用机理模拟试验研究[J].煤炭学报,2011,36(9):1451-1456.CHU Huaibao,YANG Xiaolin,LIANG Weimin,et al.Simulation experimental study on the coal blast mechanism[J].Journal of China Coal Society,2011,36(9):1451-1456.
[17]褚怀保,叶红宇,杨小林,等.基于损伤累积的爆破振动传播规模试验研究[J].振动与冲击,2016,35(2):173-177.CHU Huaibao,YE Hongyu,YANG Xiaolin,et al. Experiments on propagation of blasting vibration based on damage accumulation[J].Journal of Vibration and Shock,2016,35(2):173-177.
[18]陈明,卢文波.超早期混凝土爆破安全振动速度的讨论[J].工程爆破,2006,12(2):79-81.CHEN Ming,LU Wenbo. Safety vibration velocity of fresh concrete under blasting vibration[J]. Engineering Blasting,2006,12(2):79-81.
[19] CUI Jian,HAO Hong,SHI Yanchao,et al. Experimental study of concrete damage under high hydrostatic pressure[J]. Cement and Concrete Research,2017,100:140-152.
[2] SINGH TN,SINGH V. An intelligent approach to prediction and control ground vibration in mines[J]. Geotech Geol Eng,2005,23(3):249-262.
[3]舒大强.爆破震动对新浇混凝土质量的影响及控制[J].武汉水利电力大学学报,1999,32(4):5-8.SHU Daqiang.Effect of blasting vibration on quality of new-laid concrete and control measures[J]. Journal of Wuhan University of Hydraulic and Electric Engineering,1999,32(4):5-8.
[4]杨建华,卢文波,胡英国,等.隧洞开挖重复爆炸荷载作用下围岩累积损伤特性[J].岩土力学,2014,35(2):511-518.YANG Jianhua,LU Wenbo,HU Yingguo,et al.Accumulated damage in surrounding rocks due to repeated blasting loads during blasting excavation tunnels[J]. Rock and Soil Mechanics,2014,35(2):511-518.
[5]吴从师,黎高辉,郭开云,等.悬索桥锚碇隧道爆破开挖的围岩累积振动效应研究[J].岩石力学与工程学报,2009,28(7):1499-1505.WU Congshi,LI Gaohui,GUO Kaiyun,et al. Research on accumulated vibration effects of surrounding rock in blasting excavating anchorage tunnel for suspension bridge[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(7):1499-1505.
[6] LU,Wenbo,LUO Yi,CHEN Ming,et al.An introduction to Chinese safety regulations for blasting vibration[J].Environmental Earth Sciences,2012,11,67(7):1951-1959.
[7]李夕兵,王世鸣,宫凤强,等.不同龄期混凝土多次冲击损伤特性试验研究[J].岩石力学与工程学报,2012,31(12):2465-2472.LI Xibing,WANG Shiming,GONG Fengqiang,et al. Experimental study of damage properties of different ages concrete under multiple impact loads[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(12):2465-2472.
[8]刘彬,阳生权,姚悟闻.冲击荷载下的新浇混凝土损伤特性及强度试验研究[J].湖南工业大学学报,2017,31(3):19-25.LIU Bin,YANG Shengquan,YAO Wuwen. An experimental study on the damage feature and strength of newly-laid concrete under impact loads[J]. Journal of Hunan University of Technology,2017,31(3):19-25.
[9]李毅敏,高政国,朱庆庆,等.爆破冲击对早龄期混凝土强度影响的实验研究[J].爆炸与冲击,2013,33(3):243-248.LI Yimin,GAO Zhengguo,ZHU Qingqing,et al.An experimental investigation into effects of blast-induced vibration on strength of early-age concrete[J].Explosion and Shock Waves,2013,33(3):243-248.
[10]魏建军,邢娇秀,徐建成.早期振动对混凝土抗拉性能影响[J].公路交通科技,2011,28(1):96-99.WEI Jianjun,XING Jiaoxiu,XU Jiancheng. Effect of vibration at early concrete ages on concrete tensile strength[J].Journal of Highway and Transportation Research and Development,2011,28(1):96-99.
[11]吴帅峰,王戈,袁东凯,等.爆破振动对新浇混凝土影响的试验研究[J].振动与冲击,2017,36(2):39-44,88.WU Shuaifeng,WANG Ge,YUAN Dongkai,et al. Experimental study on the influence of blasting vibration on fresh concrete[J].Journal of Vibration and Shock,2017,36(2):39-44,88.
[12]闫长斌,王贵军,王泉伟,等.岩体爆破累积损伤效应与动力失稳机制研究[M].郑州:黄河水利出版社,2011:82-90.
[13]李林香,谢永江,冯仲伟,等.水泥水化机理及其研究方法[J].混凝土,2011(6):76-80.LI Linxiang,XIE Yongjiang,FENG Zhongwei,et al.Cement hydrarion mechanism and research methods[J]. Concrete,2011(6):76-80.
[14]戴俊.爆破工程[M].北京:机械工业出版社,2015:115-116.
[15]冯忠绪.搅拌理论及其设备的研究进展[J].工程机械,2014,45(5):1-7.FENG Zhongxu.A research of the progress in concrete mixing theory and the mixer[J]. Construction Machinery and Equipment,2014,45(5):1-7.
[16]褚怀保,杨小林,梁为民,等.煤体爆破作用机理模拟试验研究[J].煤炭学报,2011,36(9):1451-1456.CHU Huaibao,YANG Xiaolin,LIANG Weimin,et al.Simulation experimental study on the coal blast mechanism[J].Journal of China Coal Society,2011,36(9):1451-1456.
[17]褚怀保,叶红宇,杨小林,等.基于损伤累积的爆破振动传播规模试验研究[J].振动与冲击,2016,35(2):173-177.CHU Huaibao,YE Hongyu,YANG Xiaolin,et al. Experiments on propagation of blasting vibration based on damage accumulation[J].Journal of Vibration and Shock,2016,35(2):173-177.
[18]陈明,卢文波.超早期混凝土爆破安全振动速度的讨论[J].工程爆破,2006,12(2):79-81.CHEN Ming,LU Wenbo. Safety vibration velocity of fresh concrete under blasting vibration[J]. Engineering Blasting,2006,12(2):79-81.
[19] CUI Jian,HAO Hong,SHI Yanchao,et al. Experimental study of concrete damage under high hydrostatic pressure[J]. Cement and Concrete Research,2017,100:140-152.