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| Rock damage calculation method based on the damage release energy |
| LEI Mingfeng1，2，ZHAO Chenyang1，ZENG Can3，JIA Chaojun1，XU Jianfeng3，HUANG Juan1 |
| (1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；2. MOE Key Lab of Heavy Haul Railway Engineering Structure，Central South University，Changsha，Hunan 410075，China；3. Guizhou Road and Bridge Group Co.，Ltd.，Guiyang，Guizhou 550000，China) |
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Abstract The existing rock damage calculation methods have the problem of inconsistent energy calculation results for the uniaxial loading and cyclic loading. To solve this problem，both the existing calculation methods and the energy conversion mechanism are analyzed，a rock damage calculation method based on damage release energy is further proposed，and the indoor tests were conducted to verified its reliability. The research results indicate that the dissipated energy and the elastic energy released when rock sample fails are related to its damage state. These two kinds of energies can be defined as damage release energy. It is the absorbed energy from the loading to the failure in the case of uniaxial loading. For the case of cyclic loading，it is the sum of that of the initial cycle，the intermediate ones，and the final loading stage. The increment of damage release energy in the initial cycle can be obtained by integrating the loading stage and unloading stage，that in the intermediate cycle is the difference between the dissipated energy of the current cycle and the damping energy of the previous one，and that in the final loading stage is difference between the input energy of the cycle and the damping energy of the previous one. The indoor tests show that the total damage release energies for the same type of rock samples are about the same under uniaxial loading and cyclic loading. The damage evolution of rock sample during cyclic loading can be analyzed on the premise that only the uniaxial loading results are obtained. Besides，this method can better reflect the damage evolution of rock sample with the loading process.
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2022, Vol. 41 
