关键词: 掘采叠加扰动, 综放沿空巷道, 高预应力强力支护, 综合矿压监测

Abstract: In order to solve these problems of roof broken coal, soft and easily separated and caved interlayer in roof rock, sidewall convergence at the side of coal pillar, roof cracking, rib spalling, bad stability control effect, and ensure surrounding rock stability during the whole process of excavation and mining, satisfy the demand to cross-section and safety. Support parameters selection principle coupled with dynamic information design method consisted of test point investigation, geomechanics accreditation, initial design, underground monitoring, information feedback, revised design and daily monitoring were used. High prestress and intensive bolt-cable combined support system was proposed to control surrounding rock stability of 12301 working face return airway. Through engineering practice and comprehensive ground pressure monitoring, support technology application effect were verified and optimized. Investigation results showed that high prestress and intensive support was successfully accomplished in demonstration roadway, bolt and cable stress remained stable during the whole excavation and mining progress. Although there was still a relatively large convergence in coal pillar, roof was stable, the maintain of floor was greatly reduced and the safety production was fully guaranteed. Compared with original support, high prestress and intensive support technology had obvious technical and economic benefits.