Numerical simulation study on porosity coal and rock of hydraulic fracturing progress effect

摘要

In order to improve effectiveness and safety of hydraulic fracturing, used the basic principle of RFPA2D-FLOW, based on characteristics of statistical damage about coal and rock mass and Drucker-Prager failure criterion.Obtained the constitutive model of injury which by effect of hydraulic fracturing in coal and rock.On this basis, simulation verification is done on coal mass fracture which include changing of stress field, acoustic field and displacement field under the effect of high press water.The results showed that the model which has built can be well reflect fracture of coal and rock mass in hydraulic fracturing progress.