A Study on Stress Variation Law of Goaf Surrounding Rock Under the Action of Groundwater Circulation Flow Field on DDA Model
The research project takes a goaf of Mianchi County of Sanmenxia City as the research object.On DDA(Discontinuous Deformation Analysis)method,the seepage stress coupling analysis and calculation of the fractured rock mass in the goaf are carried out,and a discrete medium rock mass hydraulic model is created for the goaf.The model simulates and calculates the stress changes of the surrounding rock in the goaf caused by the groundwater circulation flow field under various conditions.The research results indicate that when the waterproof layer is destroyed,roof water flows into the mining face along fracture channels,and the change in surrounding rock pressure in the goaf is linearly related to the increase in back pressure.There is also a linear relationship between the surrounding rock pressure and ground settlement during the groundwater pumping water reinjection cycle.During the long-term cycle,there is a phenomenon of collapse and aquifer reconstruction in the surrounding rock of the goaf.
GoafSurrounding rockStress field variationsFlow field characteristics
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