Method for predicting height of water flowing fractured zone in layered fully mechanized caving mining of ultra-thick coal seam

The invention discloses an ultra-thick coal seam layered fully-mechanized caving mining water flowing fractured zone height prediction method, which comprises the following steps of: collecting geological data of a prediction working face, and mastering a working face coal mining method, overlying strata geological conditions and working face parameters in detail; according to the method, new prediction indexes such as the thickness of the overlying goaf and the distance between the working face and the main key layer are provided, a nonlinear prediction method using the GRA-LS-SVM model is provided, and the height of the overlying strata water flowing fractured zone of the ultra-thick coal seam can be accurately and economically predicted. 本发明公开了一种巨厚煤层分层综放开采导水裂隙带高度预测方法，包含以下步骤：收集预测工作面地质资料，详细掌握工作面采煤方法、覆岩地质条件、工作面参数。本发明提出上覆采空区厚度、工作面距主关键层距离等新的预测指标，提出运用GRA-LS-SVM模型非线性预测方法，能够较为准确、经济的预测出巨厚煤层覆岩导水裂隙带高度。