The flow-coupled DEM simulations are performed to better understand the hydraulic fracturing mechanism and the influence of fluid viscosity. The simulation results were in good agreement with the actual experimental results which containing the AE measurement data. As the results, the followings were found. When the low viscous fluid is used, the fluid is infiltrated into the fracture instantaneously. On the other hand, when the highly viscous fluid is used, the fluid is infiltrated slowly into the crack after the fracture elongates first. Although the tensile cracks are dominantly generated in the simulation, the energy released from a tensile crack becomes small because the tensile strength of rock is obviously small compared with the compressive strength. Such a small AE is easily buried in a noise and hard to be measured in an experiment. Therefore, in AE measurement experiment, shear type AE with large energy is dominantly observed, as many previous researches have indicated.
|出版ステータス||Published - 2009 11 27|
|イベント||43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium - Asheville, NC, United States|
継続期間: 2009 6 28 → 2009 7 1
|Other||43rd U.S. Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium|
|Period||09/6/28 → 09/7/1|
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