隧道衬砌混凝土爆破损伤累积规律试验研究
|
摘要
针对隧道衬砌混凝土爆破振动损伤累积问题,设计混凝土爆破损伤累积试验,对试块进行超声波波速测试并计算损伤值,拟合累积损伤值与爆破循环次数比之间的函数。试验结果表明,爆破振动损伤随着爆破作用次数的增加而持续增加,混凝土爆破振动累积损伤与爆破循环次数比之间存在三次多项式函数关系,爆破振动损伤累积经历了初期缓慢增长、中期快速增长和后期突变增长三个阶段。震动区测点在多次爆破振动荷载作用下,首先引起混凝土内部原生裂纹尖端局部损伤变形,随后微裂纹扩展形成细观裂纹,最后细观裂纹扩展贯通直至形成宏观裂缝,混凝土试块强度大幅度下降,累积损伤进入突变阶段后混凝土在较低损伤值条件下即可发生突然断裂破坏。
To address blasting vibration induced damage accumulation of tunnel lining concrete,a test on blasting induced damage accumulation of concrete was designed.A test of ultrasonic velocity was held on the specimen and the damage value was calculated,to fit the function between cumulative damage value and blasting cycle index ratio.The experimental results show that the blasting vibration damage continues to increase with the increase of the blasting times.A cubic polynomial function relationship exists between the cumulative damage value and blasting cycle index ratio.The blasting vibration induced damage accumulation has experienced three stages,including the slow growth in the early stage,rapid growth stage and abrupt growth stage.The blasting vibration causes damage and deformation at the original micro crack tip inside the concrete first,and then the micro crack extends to form mesoscopic cracks.Finally,the mesoscopic cracks extend and link each other until the macroscopic crack is formed.The strength of the concrete specimen drops dramatically with the increase of the blasting times,and abrupt fracture of concrete block can occur under the condition of lower damage value.
To address blasting vibration induced damage accumulation of tunnel lining concrete,a test on blasting induced damage accumulation of concrete was designed.A test of ultrasonic velocity was held on the specimen and the damage value was calculated,to fit the function between cumulative damage value and blasting cycle index ratio.The experimental results show that the blasting vibration damage continues to increase with the increase of the blasting times.A cubic polynomial function relationship exists between the cumulative damage value and blasting cycle index ratio.The blasting vibration induced damage accumulation has experienced three stages,including the slow growth in the early stage,rapid growth stage and abrupt growth stage.The blasting vibration causes damage and deformation at the original micro crack tip inside the concrete first,and then the micro crack extends to form mesoscopic cracks.Finally,the mesoscopic cracks extend and link each other until the macroscopic crack is formed.The strength of the concrete specimen drops dramatically with the increase of the blasting times,and abrupt fracture of concrete block can occur under the condition of lower damage value.
引文
[1]LI H B,XIA X,LI J C,et al.Rock Damage Control in Bedrock Blasting Excavation for Nuclear Power Plant[J].International Journal of Rock Mechanics and Mining Science,2011,48(2):210-218.
[2]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 of Tunnels[J].Rock and Soil Mechanics,2014,35(2):511-518.
[3]言志信,言浬,江平,等.爆破振动峰值速度预报方法探讨[J].振动与冲击,2010,29(5):179-182.YAN Zhixin,YAN Li,JIANG Ping,et al.Prediction Methods for Blasting-induced Ground Vibration Velocity[J].Journal of Vibration and Shock,2010,29(5):179-182.
[4]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.
[5]周文权,冷伍明,蔡德钩,等.循环荷载作用下路基粗粒土填料临界动应力和累积变形特性分析[J].铁道学报,2014,36(12):84-89.ZHOU Wenquan,LENG Wuming,CAI Degou,et al.Analysis on Characteristics of Critical Dynamic Stress and Accumulative Deformation of Coarse-grained Soil Subgrade Filling under Cyclic Loading[J].Journal of the China Railway Society,2014,36(12):84-89.
[6]易长平,卢文波,舒大强,等.爆破振动对新浇混凝土灌注桩影响的数值模拟[J].爆破,2001,18(1):31-35.YI Changping,LU Wenbo,SHU Daqiang,et al.Numerical Simulation of Blasting Vibration’s Effect on Fresh Concrete Filling Pile[J].Blasting,2001,18(1):31-35.
[7]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.
[8]杨国梁,杨仁树,车玉龙.周期性爆破振动下围岩的损伤累积效应[J].煤炭学报,2013,38(S1):25-29.YANG Guoliang,YANG Renshu,CHE Yulong.Damage Accumulative Effect of Surrounding Rock under Periodic Blasting Vibration[J].Journal of China Coal Society,2013,38(S1):25-29.
[9]闫长斌,徐国元,杨飞.爆破动荷载作用下围岩累积损伤效应声波测试研究[J].岩土工程学报,2007,29(1):88-93.YAN Changbin,XU Guoyuan,YANG Fei.Measurement of Sound Waves to Study Cumulative Damage Effect on Surrounding Rock under Blasting Load[J].Chinese Journal of Geotechnical Engineering,2007,29(1):88-93.
[10]褚怀保,杨小林,梁为民,等.煤体爆破损伤规律模拟试验研究[J].采矿与安全工程学报,2011,28(3):488-492.CHU Huaibao,YANG Xiaolin,LIANG Weimin,et al.Experimental Study on the Blast Damage Law in Simulation Coal[J].Journal of Mining&Safety Engineering,2011,28(3):488-492.
[11]杨小林,王树仁.岩石爆破损伤的细观机理[J].爆炸与冲击,2000,20(3):247-252.YANG Xiaolin,WANG Shuren.Meso Mechanism of Damage and Fracture on Rock Blasting[J].Explosion and Shock Waves,2000,20(3):247-252.
[12]杨仁树,王雁冰.切缝药包不耦合装药爆破爆生裂纹动态断裂效应的试验研究[J].岩石力学与工程学报,2013,32(7):1337-1343.YANG Renshu,WANG Yanbing.Experimental Study of Dynamic Fracture Effect of Blasting Crack in Slotted Cartridge Decoupling Charge Blasting[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(7):1337-1343.
[13]LEMAITRE J.损伤力学教程[M].傀金刚,陶春虎,译.北京:科学出版社,1996,27-164.
[14]李朝阳,宋玉普,车轶.混凝土的单轴抗压疲劳损伤累积性能研究[J].土木工程学报,2002,35(2):38-40.LI Chaoyang,SONG Yupu,CHE Yi.Study on Cumulative Damage Behavior of Concrete under Uniaxial Cyclic Load[J].China Civil Engineering Journal,2002,35(2):38-40.
[15]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.
[2]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 of Tunnels[J].Rock and Soil Mechanics,2014,35(2):511-518.
[3]言志信,言浬,江平,等.爆破振动峰值速度预报方法探讨[J].振动与冲击,2010,29(5):179-182.YAN Zhixin,YAN Li,JIANG Ping,et al.Prediction Methods for Blasting-induced Ground Vibration Velocity[J].Journal of Vibration and Shock,2010,29(5):179-182.
[4]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.
[5]周文权,冷伍明,蔡德钩,等.循环荷载作用下路基粗粒土填料临界动应力和累积变形特性分析[J].铁道学报,2014,36(12):84-89.ZHOU Wenquan,LENG Wuming,CAI Degou,et al.Analysis on Characteristics of Critical Dynamic Stress and Accumulative Deformation of Coarse-grained Soil Subgrade Filling under Cyclic Loading[J].Journal of the China Railway Society,2014,36(12):84-89.
[6]易长平,卢文波,舒大强,等.爆破振动对新浇混凝土灌注桩影响的数值模拟[J].爆破,2001,18(1):31-35.YI Changping,LU Wenbo,SHU Daqiang,et al.Numerical Simulation of Blasting Vibration’s Effect on Fresh Concrete Filling Pile[J].Blasting,2001,18(1):31-35.
[7]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.
[8]杨国梁,杨仁树,车玉龙.周期性爆破振动下围岩的损伤累积效应[J].煤炭学报,2013,38(S1):25-29.YANG Guoliang,YANG Renshu,CHE Yulong.Damage Accumulative Effect of Surrounding Rock under Periodic Blasting Vibration[J].Journal of China Coal Society,2013,38(S1):25-29.
[9]闫长斌,徐国元,杨飞.爆破动荷载作用下围岩累积损伤效应声波测试研究[J].岩土工程学报,2007,29(1):88-93.YAN Changbin,XU Guoyuan,YANG Fei.Measurement of Sound Waves to Study Cumulative Damage Effect on Surrounding Rock under Blasting Load[J].Chinese Journal of Geotechnical Engineering,2007,29(1):88-93.
[10]褚怀保,杨小林,梁为民,等.煤体爆破损伤规律模拟试验研究[J].采矿与安全工程学报,2011,28(3):488-492.CHU Huaibao,YANG Xiaolin,LIANG Weimin,et al.Experimental Study on the Blast Damage Law in Simulation Coal[J].Journal of Mining&Safety Engineering,2011,28(3):488-492.
[11]杨小林,王树仁.岩石爆破损伤的细观机理[J].爆炸与冲击,2000,20(3):247-252.YANG Xiaolin,WANG Shuren.Meso Mechanism of Damage and Fracture on Rock Blasting[J].Explosion and Shock Waves,2000,20(3):247-252.
[12]杨仁树,王雁冰.切缝药包不耦合装药爆破爆生裂纹动态断裂效应的试验研究[J].岩石力学与工程学报,2013,32(7):1337-1343.YANG Renshu,WANG Yanbing.Experimental Study of Dynamic Fracture Effect of Blasting Crack in Slotted Cartridge Decoupling Charge Blasting[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(7):1337-1343.
[13]LEMAITRE J.损伤力学教程[M].傀金刚,陶春虎,译.北京:科学出版社,1996,27-164.
[14]李朝阳,宋玉普,车轶.混凝土的单轴抗压疲劳损伤累积性能研究[J].土木工程学报,2002,35(2):38-40.LI Chaoyang,SONG Yupu,CHE Yi.Study on Cumulative Damage Behavior of Concrete under Uniaxial Cyclic Load[J].China Civil Engineering Journal,2002,35(2):38-40.
[15]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.