秦岭隧洞深部岩石力学性能及声发射特征研究
|
摘要
通过对引汉济渭工程秦岭输水隧洞深部三类岩石片麻岩、花岗岩和石英片岩开展围压水平为0、5、10、15 MPa下的三轴压缩试验,分析研究了其力学性能变化,对深部花岗岩试件进行了单轴一次循环加卸载,并同步监测声发射变化,分析了声发射振铃计数、声发射能量和应力的特征规律。结果表明:秦岭隧洞深部片麻岩、花岗岩和石英片岩三类岩石试件的峰值强度和弹性模量均随着围压的增大而逐渐增大,弹性模量增幅随围压增大有所减小。围压一定时,花岗岩的强度和弹性模量均最大,但随着围压的增大,强度相差幅度有所减小,花岗岩的黏聚力和内摩擦角最大;花岗岩试件加载破坏后应力陡降,呈脆性破坏,岩爆倾向性较强;卸载再加载时,其累计声发射振铃计数和累积能量增长迅速,振铃计数率和能量率随应力增大迅速跃升,声发射活动剧烈,卸载会加速岩石受荷不稳定破坏的进程;冲击倾向性较高的岩石在单轴受压时释放较多的能量。
Through the triaxial compression tests with the confining pressure 0,5,10 and 15 MPa,the mechanics performance change of three kinds of deep rocks including the gneiss,granite and quartz schist were analyzed and researched in the Qinling tunnel in HanjiangtoWeihe River Valley Water Diversion Project.By doing the uniaxial cyclic loading and unloading tests and synchronously monitoring the change of acoustic,the characteristics among the emission ringing counts,energy and stress of the granite specimens deep in the earth were analyzed.The results show that the peak strength and elasticity modulus gradually increase with the growing confining pressure for the deep rocks including the gneiss,granite and quartz-schist in the Qinling tunnel,while the extent of increase is taking slow.In certain circumstances of confining pressure,the granite has the most compression strength and elasticity modulus,while the difference of the strength values for the three rocks gets smaller with the growing confining pressure.Compared with other two rocks,the cohesion and the angle of internal friction for the granite are the biggest.When the granite specimens are failure under load,the stress is decreased sharply.The granite specimens took on brittle failure and have strong rockburst proneness.When unloading and reloading the acoustic emission cumulative AE events and accumulated energy grow rapidly and simultaneously the ringing counts rate and energy rate are increased rapidly with more stress.At the time AE events are intensive.The rocks,accelerated by unloading become more unstable and tend to failure.Higher impact tendency,more energy released under uniaxial press.
Through the triaxial compression tests with the confining pressure 0,5,10 and 15 MPa,the mechanics performance change of three kinds of deep rocks including the gneiss,granite and quartz schist were analyzed and researched in the Qinling tunnel in HanjiangtoWeihe River Valley Water Diversion Project.By doing the uniaxial cyclic loading and unloading tests and synchronously monitoring the change of acoustic,the characteristics among the emission ringing counts,energy and stress of the granite specimens deep in the earth were analyzed.The results show that the peak strength and elasticity modulus gradually increase with the growing confining pressure for the deep rocks including the gneiss,granite and quartz-schist in the Qinling tunnel,while the extent of increase is taking slow.In certain circumstances of confining pressure,the granite has the most compression strength and elasticity modulus,while the difference of the strength values for the three rocks gets smaller with the growing confining pressure.Compared with other two rocks,the cohesion and the angle of internal friction for the granite are the biggest.When the granite specimens are failure under load,the stress is decreased sharply.The granite specimens took on brittle failure and have strong rockburst proneness.When unloading and reloading the acoustic emission cumulative AE events and accumulated energy grow rapidly and simultaneously the ringing counts rate and energy rate are increased rapidly with more stress.At the time AE events are intensive.The rocks,accelerated by unloading become more unstable and tend to failure.Higher impact tendency,more energy released under uniaxial press.
引文
[1]罗涛,王大川,王灿.引汉济渭大型深埋无压隧洞断面优化设计[J].人民黄河,2014,36(12):97-100.
[2]邬爱清,朱杰兵.深部岩石工程力学特性及地应力测试研究综述[J].长江科学院院报,2014,31(10):43-50.
[3]苏承东,付义胜.红砂岩三轴压缩变形与强度特征的试验研究[J].岩石力学与工程学报,2014,33(s1):3164-3169.
[4]赵延喜,刘中宪,尼珂.南水北调西线工程深埋隧洞岩爆分析及预测[J].人民黄河,2015,37(12):92-95.
[5]夏冬,杨天鸿,王培涛,等.干燥及饱和岩石循环加卸载过程中声发射特征试验研究[J].煤炭学报,2014,39(7):1243-1247.
[6]许国安,牛双建,靖洪文,等.砂岩加卸载条件下能耗特征试验研究[J].岩土力学,2011,32(12):3611-3617.
[7]吴刚,翟松韬,孙红,等.高温下盐岩的声发射特性试验研究[J].岩石力学与工程学报,2014,33(6):1203-1211.
[8]刘娟红,赵力,宋少民,等.混凝土硫酸盐腐蚀损伤的声波与声发射变化特征及机理[J].工程科学学报,2016,38(8):1075-1081.
[9]陈亮,刘建锋,王春萍,等.北山深部花岗岩不同应力状态下声发射特征研究[J].岩石力学与工程学报,2012,31(s2):3618-3624.
[10]刘文德,朱星,许强,等.单轴压缩下岩石声发射及其分形特征[J].水利水电技术,2017,48(9):181-185.
[11]陈宇龙,魏作安,许江,等.单轴压缩条件下岩石声发射特性的实验研究[J].煤炭学报,2011,36(s2):237-240.
[12]邓朝福,刘建锋,徐慧宁,等.单轴加卸载条件下岩盐变形过程能量和声发射特征研究[J].工程科学与技术,2017,49(s2):150-156.
[13]袁子清,唐礼忠,杨小聪.有岩爆倾向岩石的声发射特征试验研究[J].金属矿山,2008(7):132-135.
[14]樊军伟,唐礼忠.声发射率和能率在岩石失稳破坏预测中的应用[J].金属矿山,2010(7):140-142.
[15]张子健,纪洪广,张月征,等.基于声发射试验与线弹性能判据的玲南金矿岩爆研究[J].岩石力学与工程学报,2015,34(s1):3249-3255.
[2]邬爱清,朱杰兵.深部岩石工程力学特性及地应力测试研究综述[J].长江科学院院报,2014,31(10):43-50.
[3]苏承东,付义胜.红砂岩三轴压缩变形与强度特征的试验研究[J].岩石力学与工程学报,2014,33(s1):3164-3169.
[4]赵延喜,刘中宪,尼珂.南水北调西线工程深埋隧洞岩爆分析及预测[J].人民黄河,2015,37(12):92-95.
[5]夏冬,杨天鸿,王培涛,等.干燥及饱和岩石循环加卸载过程中声发射特征试验研究[J].煤炭学报,2014,39(7):1243-1247.
[6]许国安,牛双建,靖洪文,等.砂岩加卸载条件下能耗特征试验研究[J].岩土力学,2011,32(12):3611-3617.
[7]吴刚,翟松韬,孙红,等.高温下盐岩的声发射特性试验研究[J].岩石力学与工程学报,2014,33(6):1203-1211.
[8]刘娟红,赵力,宋少民,等.混凝土硫酸盐腐蚀损伤的声波与声发射变化特征及机理[J].工程科学学报,2016,38(8):1075-1081.
[9]陈亮,刘建锋,王春萍,等.北山深部花岗岩不同应力状态下声发射特征研究[J].岩石力学与工程学报,2012,31(s2):3618-3624.
[10]刘文德,朱星,许强,等.单轴压缩下岩石声发射及其分形特征[J].水利水电技术,2017,48(9):181-185.
[11]陈宇龙,魏作安,许江,等.单轴压缩条件下岩石声发射特性的实验研究[J].煤炭学报,2011,36(s2):237-240.
[12]邓朝福,刘建锋,徐慧宁,等.单轴加卸载条件下岩盐变形过程能量和声发射特征研究[J].工程科学与技术,2017,49(s2):150-156.
[13]袁子清,唐礼忠,杨小聪.有岩爆倾向岩石的声发射特征试验研究[J].金属矿山,2008(7):132-135.
[14]樊军伟,唐礼忠.声发射率和能率在岩石失稳破坏预测中的应用[J].金属矿山,2010(7):140-142.
[15]张子健,纪洪广,张月征,等.基于声发射试验与线弹性能判据的玲南金矿岩爆研究[J].岩石力学与工程学报,2015,34(s1):3249-3255.