CAJ | 학술논문

针对深立井过受瓦斯抽排孔群扰动的煤岩层工程安全问题，分析了钻孔群对煤岩层的扰动影响，基于损伤力学理论建立了定量的扰动损伤评估模型，对淮北海孜煤矿千米立井过受瓦斯抽排孔群扰动煤岩层的稳定性及井筒掘砌过程进行了数值模拟，根据分析结果优化了受扰动煤岩层的加固与井筒掘砌支护方案。研究结果表明：瓦斯抽排钻孔群对煤岩层的扰动评估应综合考虑钻孔水“冲刷效应”、煤岩体“卸压效应”及“孔群效应”，3种效应相互作用使得煤与软弱泥岩受损程度远大于稳定粉砂岩层；煤与软弱泥岩层受瓦斯抽排孔扰动后易于出现大范围失稳；井筒掘砌过相应扰动层位前，可利用瓦斯抽排孔进行预注浆加固受损围岩，通过加强掘进初期支护、提高井壁混凝土抗拉性能及壁后注浆等综合措施确保围岩稳定与支护安全。
침대심립정과수와사추배공군우동적매암층공정안전문제，분석료찬공군대매암층적우동영향，기우손상역학이론건립료정량적우동손상평고모형，대회북해자매광천미립정과수와사추배공군우동매암층적은정성급정통굴체과정진행료수치모의，근거분석결과우화료수우동매암층적가고여정통굴체지호방안。연구결과표명：와사추배찬공군대매암층적우동평고응종합고필찬공수“충쇄효응”、매암체“사압효응”급“공군효응”，3충효응상호작용사득매여연약니암수손정도원대우은정분사암층；매여연약니암층수와사추배공우동후역우출현대범위실은；정통굴체과상응우동층위전，가이용와사추배공진행예주장가고수손위암，통과가강굴진초기지호、제고정벽혼응토항랍성능급벽후주장등종합조시학보위암은정여지호안전。
Aiming to ensure the security of deep vertical shaft through the coal and rock seams which are disturbed by array gas-discharging holes, the disturbing mechanism is analyzed, and a damage eval-uation model is established based on the damage mechanics theory. Then, the stability of disturbance coal and rock seams, mechanical response of rock excavation and shaft lining placement are simulated by numerical method specific to a km deep vertical shaft in Haizi coal mine. Based on the analysis re-sult, support scheme of deep vertical shaft through the coal and rock seams disturbed by array gas-discharging holes is optimized. Results show that, to evaluate the damage of coal and rock seams disturbed by array gas-discharging holes, the erosion action of water in drill hole, pressure-relief and ar-ray holes effect of coal and rock seams should be considered at the same time, as the integrating of the three effect causes a larger damage of coal and mudstone stratum than the siltstone stratum. Disturbed coal and mudstone stratum is apt to be unstable in a great range. In order to ensure the stability of sur-rounding rock and support, firstly, before the vertical shaft pass through the relevant strata, gas-discharging holes are used in pre-grouting to reinforce the surrounding rock;secondly, during the excavate and pouring process of shaft lining, some strengthened initial support is constructed in time, and the tensile properties of shaft lining concrete is improved;thirdly, after the shaft lining pass through the disturbed strata, the surrounding rock is reinforced by backfill grouting in time.