Title of Paper:NUMERICAL SIMULATION OF UNLOADING VELOCITY INFLUENCING STABILITY OF SOLID FLUID SURROUNDING ROCK

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Date of Publication:2009-01-01

Included Journals:CPCI-S

Page Number:915-920

Abstract:The rock mass of underground engineering excavation is a dynamic effect problem, especially in geological zones with solid-fluid interaction in high stress fields. The dynamic excavation should induce the coupling adjustment of both solid framework stress fields and pore pressures of liquids. It is difficult to get these analytical computing results with laboratory testing. This paper contains numerical simulations for solid-fluid surrounding rocks in dynamics unloading conditions using the Lagrange soft code-FLAC. The time course regulations of tangential stress, radial stress, and pore water pressure with dynamic unloading have been found, and the pore water pressure's effect on stress disturbance of unloading has been summarized. While using the dynamic effect according to three different unloading velocities, the paper simulates and compares the stress and pore pressure time course lines of character points respectively while creating the distribution contour maps of pore pressure and plastic zones. The simulation result states that unloading velocity has a significant effect on solid-fluid rock. The faster the unloading velocity, the larger the degree of rock destruction will occur.