(1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Provence and the Ministry of Science and Technology，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；2. Key Laboratory
of Safety and High-efficiency Coal Mining，Ministry of Education，Anhui University of Science and Technology，
Huainan，Anhui 232001，China；3. School of Materials Science and Engineering，Shandong University
of Science and Technology，Qingdao，Shandong 266590，China)
Abstract：In order to explore the creep hardening characters of filling paste，a series of experiments were launched with specific compositions，including the water content and density determination experiments，the uniaxial compression experiment and creep experiment and the scanning electron microscopy. The results show that water content and density of the samples comply with the normal distribution with small discrepancy. The water content and density have no correlation with the strength of filling paste. The strain rate at the elastic stage decreases and the instantaneous deformation moduli of specimens increase with the increasing of stress level. The instantaneous deformation moduli under loading period of 2，4 and 8 h are 1.17×105%，1.21×105% and 1.23×105% respectively，and the average growth rate is 1.20×105%. The enhancing factors of effective moduli are respectively 0.813 9，0.873 7 and 0.911 8 under 2，4 and 8 h loading，and the average enhancing factor of effective moduli is 0.866 5 which is 1.14 times of the factor in uniaxial compressive experiment. The internal structure of filling paste specimens becomes well-distributed and dense under slowly loading process. The adjustment of internal structure of filling paste occurs and there are triangular strengthening cracks inside under long-term bearing，leading to the increasing of loading capacity. The adjustment of internal structure becomes more obvious with longer loading period. The creep coefficients of filling paste under 2，4 and 8 h loading are 1.06，1.16 and 1.20 respectively，and the average creep coefficient is 1.14.
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2016, Vol. 35 
