Stability Analysis on Subsequent Filling Body in Open Field and Design of Belt Filling Structure
The stability of the subsequent filling body in the mid-segment mining of the rooms lacks systematic research,and the strength design of the filling body mainly relies on experience and engineering analogy.In response to this issue,in order to improve the strength design level of the subsequent filling body,the mechanical parameters of the filling body with different filling ratios were measured based on the actual filling mining of a certain iron mine,and a large-scale subsequent filling analysis model for evaluating consecutive backfill operations across seven mine rooms was established.Through numerical simulation research,the plastic zone,stress,and deformation distribution of the first-step filling body after each mining step were obtained,and the position and evolution law of the potential sliding surface of the filling body were calculated.The results show that the instability and failure of the filling body in the first step occurs in the lower sections,around the midsection,and near the ceiling.In this regard,a belt filling structure design was proposed,which means that subsequent filling does not require the use of homogeneous filling strength,and should focus on strengthening the upper,middle,and lower weak areas,while other filling areas can be filled with a lower strength.Analysis shows that this belt filling structure has a good overall stability and can significantly reduce filling costs.
Strength of the filling bodyMid-segment miningSubsequent fillingBelt filling structureNumerical simulation
万方数据
维普
