小净距隧道爆破中夹岩累积损伤测试研究
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摘要
为研究小净距隧道爆破对临近隧道的影响,本文结合沈海高速公路泉厦扩建工程大坪山隧道施工监测,对小净距隧道中夹岩爆破振动累积损伤进行测试研究。分析了距离掌子面不同位置、爆破次数对中夹岩的累积损伤规律。结果表明:6个测试孔一次爆破和二次爆破后的波速平均降低2.12%;平均爆破累积损伤量为4.3%.研究成果可为类似条件下小净距隧道的现场监测、爆破控制和建立动荷载作用下隧道破坏临界值提供依据。
In order to learn the blast impact on the shared rock in tunnels,the vibration response and cumulative damage of the small interval tunnel were tested and investigated based on the vibration monitoring for the Dapingshan tunnel in Quanxia highway extension project.The influences of the distance from the blast section and the blast times on the cumulative damage of shared rock were analyzed.The results show that,in six test holes,after the first and second blast,the wave velocity reduces to 97.88%,and the average cumulated blasting damage is 4.3%.It can be used as a basis for the blast control,site monitoring and establishing the tunnel damage threshold under dynamic load.
In order to learn the blast impact on the shared rock in tunnels,the vibration response and cumulative damage of the small interval tunnel were tested and investigated based on the vibration monitoring for the Dapingshan tunnel in Quanxia highway extension project.The influences of the distance from the blast section and the blast times on the cumulative damage of shared rock were analyzed.The results show that,in six test holes,after the first and second blast,the wave velocity reduces to 97.88%,and the average cumulated blasting damage is 4.3%.It can be used as a basis for the blast control,site monitoring and establishing the tunnel damage threshold under dynamic load.
引文
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[2]Otuonye F O.Response of ground roof bolt to blasting loading[J].International Journal of Rock Mechanics&Mining Sciences,1988,25(5):345-349.
[3]汪旭光,熊代余.第六届国际岩石爆破破碎学术会议综述[J].爆破,2000,17(增刊):1-5WANG Xu-guang,XIONG Dai-yu.The summary of sixth interna-tional symposium on rock blasting broken.[J].Blasting,2000,17(S):1-5.(in Chinese)
[4]阳生权.爆破地震累积效应理论和应用初步研究[D].长沙:中南大学,2002.YANG Sheng-quan.Study on theory and application of blasting vi-bration cumulative effects[D].Changsha:Zhongnan University,2002.(in Chinese)
[5]马建军.软岩巷道在周边爆破作用下的稳定性研究[D].北京:北京理工大学,2004.MA Jian-jun.The stability study of the soft rock tunnel under theperimeter blasting[D]Beijing:Beijing Institute of Technology.2004.(in Chinese)
[6]闫长斌,徐国元,李夕兵.爆破震动对采空区稳定性影响的FLAC3D分析[J].岩石力学与工程学报,2005,24(16):2894-2899.YAN Chang-bin,XU Guo-yuan,LI Xi-bing.BFLAC3D analysis ofstability of blasting vibration on of mined-out area[J].Journal ofRock Mechanics and Engineering,2005,24(16):2894-2899.(inChinese)
[7]冯叔瑜,王中黔.地铁爆破的震动问题[J].中国铁道科学,1999,20(2):30-34.FENG Shu-yu,WANG Zhong-qian.Blasting vibration problem ofsubway[J].China Railway Science,1999,20(2):30-34.(in Chi-nese)
[8]林从谋,杨林德.浅埋隧道掘进爆破地面振动特征研究[J].地下空间与工程学报,2006,2(2):276-279.LIN Cong-mou,YANG Lin-de.Characteristics of blasting groundvibration of shallow tunnel tunneling blasting[J].Underground Spaceand Engineering,2006,2(2):276-279.(in Chinese)
[9]闫长斌,徐国元.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 Chang-bin,XU Guo-yuan.Measurement of sound waves tostudy cumulative damage effect on surrounding rock under blastingload[J].Chinese Journal Geotechnical Engineering.2007,29(1):88-93.(in Chinese)
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