Study on floor instability law of cemented filling mining above a confined aquifer

To solve the problem of floor water inrush in process coal mining on a confined aquifer and study law instability, cemented filling method is proposed paper. Using river sand cement as materials, cementitious material with concentration 75% content 15% has best flow mechanical properties. Based elastic half-space theory bearing characteristics backfill, model stability established, critical criterion instability proposed, relationship between failure depth location pressure obtained. The numerical simulation test scheme designed, FLAC3D fluid-structure coupling element used to explore process. research results show that will gradually decrease increase strength distance, pressure. provide useful reference for safe resources aquifer.