温–压耦合及动力扰动下岩石破碎的能量耗散.pdfVIP

温–压耦合及动力扰动下岩石破碎的能量耗散.pdf

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温–压耦合及动力扰动下岩石破碎的能量耗散

32 6 Vol.32 No.6 2013 6 Chinese Journal of Rock Mechanics and Engineering June 2013 12 12 12 12 12 (1. 410083 2. 410083) 4 (20 100 200 300 ) 0206080 MPa 20 200 300 20 MPa 100 (0 MPa) TU 45 A 2013 ENERGY DISSIPATION OF ROCK FRACTURE UNDER THERMO- MECHANICAL COUPLING AND DYNAMIC DISTURBANCES YINTubing12 LIXibing12 YEZhouyuan12 GONG Fengqiang12 ZHOU Zilong12 (1. School of Resources and Safety EngineeringCentral South UniversityChangshaHunan410083China2. Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal MinesCentral South UniversityChangshaHunan410083China) Abstract Under different temperatures(20 100 200 300 )the impact experiments of sandstone samples with different axial pressures(0206080 MPa) were carried out by a self-developed dynamic testing system under thermo-mechanical coupling. With the test resultsthe damage dissipation energy of rock under thermo-mechanical coupling can be calculated based on the principle of energy dissipation in conventional split Hopkinson pressure bar(SHPB). The results show thatat a given dynamic loadrock samples at temperatures of 20 200 and 300 and axial pressure of 20 MPa have the maximal energy-absorb capability but at temperature of 100 rock samples under axial pressure of 0 MPa have the maximal energy-absorb capability. The results are helpful for understanding rock fracture mechanism of rock under high temperatures and can be used in the practical rock engineering. Key words rock mechanics high temperatures static-dynamic coupling loads energy dissipation split hopkinson pressure bar(SHP

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