METHOD FOR DETERMINING INTERNAL STRESS OF SOLID-CUT-AND-FILL MATERIAL

The present invention discloses a method for determining internal stress of a solid filling material, comprising the following steps: step 1) acquiring stress data of the solid filling material, and fitting the stress-strain relationship of the solid filling material; step 2) calculating surface subsidence in the solid filling area on the basis of an equivalent mining height theory with a probability integration method; step 3) calculating the expansion height of fractured zones in the area under a solid-backfill coal mining condition; step 4) calculating the strain in the solid filling material at a distance L from the rear of the stope by combing with step 2) and step 3); step 5) calculating internal stress in the solid filling material at distance L from the rear of the working face. The present invention attains the following beneficial effects: the present invention provides a method for calculating the stress in filling mass for solid-backfill coal mining. The method is simple and practical, and is of great significance for reckoning the distribution of the stress in the surrounding rock for solid backfill mining, guiding the backfill mining support design, and enriching the backfill mining pressure theory system.