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| ALGORITHM TO ESTIMATE TENSILE MODULUS OF ROCK IN DISK IMPACT SPLITTING TEST |
| GONG Fengqiang1，2，LI Xibing1，2，DONG Longjun1 |
| (1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China；2. Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines，Central South University，Changsha，Hunan 410083，China) |
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Abstract An analytic algorithm to estimate the tensile modulus of disk impact splitting test was presented. Combined the theoretical elastic solution of disk on cardiac force and the physical parameters obtained in actual measure of experiments，and based on the principle of calculus，the quantitative relationship between tensile modulus of rock specimen center and the total displacement of deformation on the direction of the vertical load was derived. The relationship between the deformation on the vertical-loading direction and that on the parallel- loading direction was analyzed；and there is a linear relation between two deformations and this relation can be expressed with a ratio function. At last，combined with split Hopkinson pressure bar(SHPB) impact splitting test principle，measuring the deformation on the parallel-loading direction and obtaining the deformation on the vertical-loading direction by using that ratio function. And then the impact splitting tensile modulus can be obtained with a derivation function by substituting the deformation on the vertical-loading direction. Five physical parameters，including the impact loading power，sample diameter，sample thickness，rock Poisson?s ratio and the total deformation on the parallel-loading direction，were used in this derivation function. This derivation function has a clear meaning and easy to use，and provide a new approach to estimate the tensile modulus in Brazilian disk splitting test.
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Received: 29 October 2012
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2013, Vol. 32 
