Experimental study on load/unload response ratio and Kaiser effect when rocks under cycling load
Rock is a typically inhomogeneous and anisotropic material, which contains several natural defects with various scales, such as micro-cracks, pores, fissures, joints inclusions, and precipitates. Large numbers of acoustic emission (AE) signals will be generated when rock is loaded until failure. Experimental study on rock damage process under cycling load based on acoustic emission technique was carried out. Mathematical relation between rock damage and AE counts based on damage theory and load/unload response ratio theory was established to study rock damage process and Kaiser effect. The Experimental results show that acoustic emission can reflect the rock damage process. Under cycling loading, rock damage is increasing during unload process with load increasing. There is internal relation between load/unload response ratio of AE and Kaiser effect. The damage during unload phase may be the induced factor for the occurrence of AE before the previously applied stress reached when specimens under re-load.
acoustic emission (AE) rock failure damage load/unload response ratio Kaiser effect
Liu Jian-Po Yang Yu-Jiang Li Yuan-Hui
College of Resources & Civil Engineering, Northeastern University, Shenyang, China
国际会议
The Fifth International Symposium on In-situ Rock Stress(第五届国际岩石应力研讨会)
北京
英文
205-209
2010-08-25（万方平台首次上网日期，不代表论文的发表时间）