A New Prediction Model of Surface Subsidence with Cauchy Distribution in the Coal Mine of Thick Topsoil Condition

摘要

Coal is the main energy source in China, but its underground mining causes surface subsidence, whichseriously damages the ecological and living environments. How to calculate subsidence accurately is a coreissue in evaluating mining damage. At present, the most commonly used method of calculation is theProbability Integral Method (PIM), based on a normal distribution. However, this method has limitationsin thick topsoil (thickness > 100 m), in that the extent of the calculated boundary of the subsidence basinis smaller than its real extent, and this has an undoubted impact on the accurate assessment of the extentof mining damage. Therefore, this paper introduces a calculation model for surface subsidence based ona Cauchy distribution for thick topsoil conditions. This not only improves the accuracy of calculation at thesubsidence basin boundary, but also provides a universal method for the calculation of surface subsidence.