关键词: 深埋厚顶板, 强矿压显现, 应力演化规律, 区域水力压裂, 关键致灾层位

Abstract: Aiming at the problems of high stope stress, large deformation amount and large roof fracture energy of the working face under the condition of deep buried thick sandstone roof remining, the FLAC numerical simulation of the stress evolution law and stope displacement evolution law of the 130207 deeply buried high-stress stope is simulated, and the results show that when the working face is advanced to the primary square and the second square, there will be high stress concentration, the concentration coefficient can reach up to 2.5~4.0, and the horizontal displacement of the return air lane gang during the second square period can reach 390mm. The kick drum volume can reach 413mm. In order to ensure the safe recovery of the working face, a regional hydraulic fracturing and pressure relief scheme was formulated, and the key disaster-causing layer of the working face was calculated according to the key layer theory and composite beam theory 130207 the key disaster-causing layer of the working face was 22.83m thick coarse-grained sandstone layer and 40.23m thick coarse-grained sandstone layer, and the rupture pressure was 13.06MPa according to the calculation formula of Hubbert-Willsi non-permeable formation rupture pressure. After regional hydraulic fracturing, the working face cycle pressure step distance and the continuous pressure distance were significantly reduced, the influence range and stress concentration coefficient of the advanced supporting pressure were significantly reduced, and the daily maximum energy and daily average energy of the working face were significantly reduced, which indicated that the hydraulic fracturing technology in the directional area had good effect and had promotion and application value.