Calculation Model for Progressive Residual Surface Subsidence above Mined-Out Areas Based on Logistic Time Function

The exploitation of underground coal resources has stepped up local economic and social development significantly. However, it was inevitable that time-dependent surface settlement would occur above the mined-out voids. Subsidence associated with geo-mining can last from several months to scores years seriously impact infrastructure, city planning, space utilization. This paper addresses problems in predicting progressive residual subsidence. subsidence process divided into three phases: a duration period, long-term period. Then, novel mathematical model calculating proposed based on logistic time function. After period extrapolated according threshold sinking rate. validation for estimated light observed situ data. results demonstrate function is an ideal reflecting features downward movement, rate, acceleration. coefficient, which plays crucial role settling, varies directly parameters inversely time. influence amount data predicted values pronounced. Observation must extend beyond active Thus back-calculated measurement be reliable. Conversely, deviation between predictive field-based ones significant. conclusions this study guide project design resulting longwall operation. affords insights valuable land reutilization, stabilization estimation foundation abandoned workface.