Numerical Analysis on Loading History Correlation for Large Deformation Control within Deep Soft Rock

The correlation of the load history in the nonlinear large deformation mechanical design method is discussed. Then the different schemes of support construction process which are used to control the nonlinear large deformation of the east wing main haulage roadway in -1000m level of a certain coal mine are simulated by the program of 3D finite difference. The results show that the deformation results, the displacement distribution characteristics and the stress concentration degree of surrounding rock are significantly different due to the different construction sequence. After plastic large deformation occurs in deep soft rock ,the mechanical response characteristics of the surrounding rock closely related to the entire loading history. And different construction sequence will produce different deformation control effect. Therefore, the use of large deformation mechanical design method for the supporting design of deep soft rock is necessary, then based on the proposing of the mechanical countermeasures the best construction process is determined, and the optimization of support parameters must be for this process.