Research On The Effects Of Creep Discipline Of Soft Rock Under The Coupling Of Temperature, Stress And PH Of Groundwater

With the increasing of mining strength gradually and the reducing or drying of the shallow resources, the underground mining started to tend to deep mining. The deep rock is in a complex mechanical environment, which are characterized by high temperature, high ground stress, high pressure and mining disturbance. So its mining led to a series of safety problems, such as the strata movement, stent damage and rock explosion and so on. Therefore, it has the vital significance to study the mechanics problems of the deep rock in the process of mining. To study the creep rule of the soft rock in the coupling environment also have important value for deep mining design and maintenance.The mathematical model under the stress field,temperature field and consider the chemical corrosion under karst water field are the theoretical basis to study the creep rule in underground complex environment. We drawed the mathematical model under the co- mplex environment in the coupling underground from the mass conservation equation, balance equation, energy conservation equation and the corresponding property equation. Through the single and triaxial creep experiments contained temperature and the pH of karst water, we obtain the elastic modulus of deep rock decreases and poisson ratio increases with the increase of the pH conclusion. The creep value and creep of variable ratio of the soft rock increases with the increase of the pH conclusion, and the biggest change was happened in acidic environment.Combining the basic mechanics model, we compared with the different model using Matlab for experimental data and obtained the best element combination mechanics model and the fitting model parameters. We further verified consistency of experimental data and the model.Carries on the simulation of soft rock tunnel calculation by ANSYS, we obtained creep rule of the surrounding rock, further confirmed the consistency of theoretical calculation and experimental conclusion.