The Study On The Whole Process Of Concrete Uniaxial Load By Acoustic Emission Experiments

By using China university of geosciences (Beijing) mechanics laboratory WAW2000DL electro-hydraulic servo test system and SAEU2S acoustic emission apparatus, studied in different strength concrete specimens of the whole process of the unidirectional under load by acoustic emission parameters characteristics, established strength damage models of concrete and analyze the relationship between Kaiser effect and Felicity effect.1. According to the uniaxial compression test of the different strength of concrete,and record the whole process of acoustic emission damage characteristic parameters,then found that acoustic emission signal and mechanical properties of concrete specimens linked closely,the strength of concrete specimens stress-strain curve and acoustic emission characteristic parameters are fitted well,and when the specimen destroyed,acoustic emission event rate mutated.2. According to the uniaxial splitting tensile test of different strength of concrete specimens,record the whole process of acoustic emission damage characteristic parameters,and compare with the uniaxial compression test results ,then found the concrete samples which under uniaxial compression and splitting tensile process have similarities but also exist larger difference.3. Through the uniaxial compression test of 9 different strength of concrete, based on the analysis of the damage from the microscopic mechanism of concrete and the theory analysis ,then put forward a weibull distribution with the statistical damage evolution model, and gain the model fitting test data of acoustic emission. Contrast the theoretical model and actual results,found that both are consistent with the theory,verify the validity of the model.4. On the strength of concrete test blocks for C30 cycle loading test and found concrete exist obvious Kaiser effect,through the analysis of Felicity effect,more accurately determine the Kaiser effect of concrete samples of stress range.