Failure Mechanism of Rock Bridge Based on Acoustic Emission Technique

Acoustic emission (AE) technique is widely used in various fields as a reliable nondestructive examination technology. Two experimental tests were carried out in a rock mechanics laboratory, which include (1) small scale direct shear tests of rock bridge with different lengths and (2) large scale landslide model with locked section. The relationship of AE event count and record time was analyzed during the tests. The AE source location technology and comparative analysis with its actual failure model were done. It can be found that whether it is small scale test or large scale landslide model test, AE technique accurately located the AE source point, which reflected the failure generation and expansion of internal cracks in rock samples. Large scale landslide model with locked section test showed that rock bridge in rocky slope has typical brittle failure behavior. The two tests based on AE technique well revealed the rock failure mechanism in rocky slope and clarified the cause of high speed and long distance sliding of rocky slope.

[1]  Feng Dai,et al.  Numerical Assessment of the Progressive Rock Fracture Mechanism of Cracked Chevron Notched Brazilian Disc Specimens , 2015, Rock Mechanics and Rock Engineering.

[2]  Guofeng Zhang,et al.  Temperature effect of rock burst for hard rock in deep-buried tunnel , 2014, Natural Hazards.

[3]  Chun An Tang,et al.  The Dynamic Evaluation of Rock Slope Stability Considering the Effects of Microseismic Damage , 2014, Rock Mechanics and Rock Engineering.

[4]  Guangsi Zhao,et al.  Measurement of Additional Strains in Shaft Lining Using Differential Resistance Sensing Technology , 2013, Int. J. Distributed Sens. Networks.

[5]  Ranjith Pathegama Gamage,et al.  Fracture Behavior of Intact Rock Using Acoustic Emission: Experimental Observation and Realistic Modeling , 2013 .

[6]  Huilin Xing,et al.  A three-dimensional numerical investigation of the fracture of rock specimens containing a pre-existing surface flaw , 2012 .

[7]  J. Chen,et al.  Time-Dependent Damage Investigation of Rock Mass in an In Situ Experimental Tunnel , 2012, Materials.

[8]  Xiating Feng,et al.  In situ monitoring of rockburst nucleation and evolution in the deeply buried tunnels of Jinping II hydropower station , 2012 .

[9]  Peng-Zhi Pan,et al.  Modeling the cracking process of rocks from continuity to discontinuity using a cellular automaton , 2012, Comput. Geosci..

[10]  Shanyong Wang,et al.  Experimental Investigation on the Strength, Deformability, Failure Behavior and Acoustic Emission Locations of Red Sandstone Under Triaxial Compression , 2012, Rock Mechanics and Rock Engineering.

[11]  W. Marsden.  I and J , 2012 .

[12]  Guang Si Zhao,et al.  R/S Analysis for Stress Evolution in Shaft Lining and Fracture Prediction Method , 2011 .

[13]  Chun An Tang,et al.  Microseismic monitoring and stability analysis of the left bank slope in Jinping first stage hydropower station in southwestern China , 2011 .

[14]  Dae-Sung Cheon,et al.  Evaluation of damage level for rock slopes using acoustic emission technique with waveguides , 2011 .

[15]  Hongyuan Liu,et al.  Numerical simulation of the rock fragmentation process induced by two drill bits subjected to static and dynamic (impact) loading , 2011 .

[16]  Xibing Li,et al.  Influence of Sample Height-to-Width Ratios on Failure Mode for Rectangular Prism Samples of Hard Rock Loaded In Uniaxial Compression , 2011 .

[17]  A. Ghazvinian,et al.  Analysis of Crack Coalescence In Rock Bridges Using Neural Network , 2010 .

[18]  Li Ai-qun.  Advances in Researches on Application of Acoustic Emission Technique to Health Monitoring for Bridge Structures , 2010 .

[19]  Zu-yu Chen,et al.  Rock bridge slice element method in slope stability analysis based on multi-scale geological structure mapping , 2008 .

[20]  Hui Zhou,et al.  Simulation of the rock microfracturing process under uniaxial compression using an elasto-plastic cellular automaton , 2006 .

[21]  John M Kemeny,et al.  Time-dependent drift degradation due to the progressive failure of rock bridges along discontinuities , 2005 .

[22]  Shu Cai Li,et al.  A Study of Fracture Mechanism and Shear Strength of Rock Bridges through Analytical and Model-Testing Methods , 2004 .

[23]  J. Vilhelm,et al.  Laboratory studies of acoustic emission prior to uniaxial compressive rock failure , 2000 .

[24]  C. Tang,et al.  Pattern of Coalescence of Rock Bridge Between Two Joints Under Shear Testing , 1999 .

[25]  Xia-Ting Feng,et al.  Fractal structure of the time distribution of microfracturing in rocks , 1999 .

[26]  D. Hutchins,et al.  Ultrasonic imaging and acoustic emission monitoring of thermally induced microcracks in Lac du Bonnet granite , 1993 .

[27]  D. Lockner.  The role of acoustic emission in the study of rock fracture , 1993 .

[28]  Masahiro Chigira,et al.  Long-term gravitational deformation of rocks by mass rock creep , 1992 .

[29]  O. Stephansson,et al.  Cyclic loading characteristics of joints and rock bridges in a jointed rock specimen , 1990 .

[30]  O. Stephansson,et al.  Behaviour of rock joints and rock bridges in shear testing , 1990 .

[31]  A. Jones.  10 – Rock Mechanics and Rock Engineering , 1989 .

[32]  W. Spence,et al.  Relative epicenter determination using P-wave arrival-time differences , 1980 .