不同应力途径三轴压缩下岩石的声发射
ACOUSTIC EMISSION OF ROCKS UNDER TRIAXIAL COMPRESSION ALONG VARIOUS STRESS PATHS
-
摘要: 在不同加载方式的三轴实验中,观测了济南辉长岩和北京昌平花岗岩的声发射(围压达1.3千巴).当最大主应力增加使岩样破坏时(A型),平均声发射率逐渐增加,离破裂强度约几百巴时声发射急剧增多.而当岩石处于一定的高应力状态,通过减小围压使岩样破坏时(B型),声发射的急剧增加仅出现在离破裂差应力20-30巴的情况下,而且这种破裂过程声发射总数只有 A 型的1/3左右.在 B 型加载情况下,从应力场的球张量部分(流体静压力)来看,是一个卸载过程,而从偏张量部分来看,是一个加载过程.这种卸载过程的存在很可能是造成声发射不同特征的主要原因.Abstract: Acoustic emission of Jinan gabbro and Shangpin granite samples has been observed under triaxial compression along various stress paths (confining pressure up to 1.3 kb). When the maximum principal stress was increased until the rock sample failed (case A), the average acoustic emission rate gradual increased, an abrupt increase of acoustic emission occurred at about several hundred bars prior to rupture. When starting from a high stress state and the confining pressure was decreased (caseB), an abrupt increase of acoustic emission occurred much later, only about 20-30 bars before rupture. The total number of acoustic emission in the fracture process was much less only one-third of that in case A. There were two processes in case B: loading process for differential tensor component of the stress field; unloading process for spherical symmetric tensor componen (hydrostatic). It is possible that the different characteristics of acoustic emission is due to the existence of the unloading process.
-
-
[1] K Mogi, Earthquakes as fractxxre in the earth, in "Advances in Rock Mechanics"Proc. 3rd.Conf. Int. Soc. Rock Mechanics, IA, 559——568. 1974.
[2] C. H. Seholz, Experimental study of the fracturing process in brittle rocks, J. Geophys. Res., 73,1447——1454,1968
[3] C. F. Bacon, Acoustic emission along the San Andreas fault in southern central California, Ma——terials evaluation,34.5. 1976.
[4] J. D. Byerlee, A review of rock mechanics studies in the United States pertinent to earthquake prediction, PAGEOPH, 116(4/5),586——602, 1978
[5] K, Mogi, Study of elastic shocks caused by the fracture of heterogeneous materials, and its rela——tion to the earthquake phenomena, Bull. Eartla. Res. Inst., 40, 1, 105——173, 1962
[6] H. J. Alheid and F. Rummel. Acoustic emission during frietiona.l sliding along shear planes in rock in "Proc. First conf. on Acoustic Emission/Microscismic Activity in Geological Sttuctttre and Materials",149——154. 1977.
[7] R Chen, N .G. Geng, and X. X. Yiao, Strength and volume changes of rocks under triaxial com——pression with various stress paths, Submitted to Scientia ,Sinica. 11. 1093——1100. 1979
[8] R.W B. Stepliens, A. A.Polloek, Waveform and frequency spectra of acoustic emission,J. of Acoustic Society of America,50,3,904——910,1970[1] K Mogi, Earthquakes as fractxxre in the earth, in "Advances in Rock Mechanics"Proc. 3rd.Conf. Int. Soc. Rock Mechanics, IA, 559——568. 1974.
[2] C. H. Seholz, Experimental study of the fracturing process in brittle rocks, J. Geophys. Res., 73,1447——1454,1968
[3] C. F. Bacon, Acoustic emission along the San Andreas fault in southern central California, Ma——terials evaluation,34.5. 1976.
[4] J. D. Byerlee, A review of rock mechanics studies in the United States pertinent to earthquake prediction, PAGEOPH, 116(4/5),586——602, 1978
[5] K, Mogi, Study of elastic shocks caused by the fracture of heterogeneous materials, and its rela——tion to the earthquake phenomena, Bull. Eartla. Res. Inst., 40, 1, 105——173, 1962
[6] H. J. Alheid and F. Rummel. Acoustic emission during frietiona.l sliding along shear planes in rock in "Proc. First conf. on Acoustic Emission/Microscismic Activity in Geological Sttuctttre and Materials",149——154. 1977.
[7] R Chen, N .G. Geng, and X. X. Yiao, Strength and volume changes of rocks under triaxial com——pression with various stress paths, Submitted to Scientia ,Sinica. 11. 1093——1100. 1979
[8] R.W B. Stepliens, A. A.Polloek, Waveform and frequency spectra of acoustic emission,J. of Acoustic Society of America,50,3,904——910,1970 -
期刊类型引用(5)
1. 刘中宪,周健,李程程,孟思博. 基于修正随机有限断层法的沉积盆地地震动模拟. 防灾减灾工程学报. 2023(05): 999-1008 . 百度学术
2. 巴振宁,赵靖轩,吴孟桃,梁建文. 基于CPU-GPU异构并行的复杂场地近断层地震动谱元法模拟. 地震学报. 2022(01): 182-193 . 本站查看
3. 何欣娟,潘华. 2021年云南漾濞M_S6.4地震的强地面运动模拟. 地震地质. 2021(04): 920-935 . 百度学术
4. 谢旭,黄文彤,冀龙飞,王天佳. 断层破裂过程对减隔震桥梁地震反应的影响. 浙江大学学报(工学版). 2021(12): 2225-2233 . 百度学术
5. 张冬锋,付长华,吕红山,俞瑞芳. 随机有限断层法及其工程应用中的问题分析. 震灾防御技术. 2018(04): 784-800 . 百度学术
其他类型引用(6)
计量
- 文章访问数: 1113
- HTML全文浏览量: 11
- PDF下载量: 115
- 被引次数: 11