摘要
在分析冲击矿压发生和锚网索支护防冲机制的基础上,从支护构件柔性吸能和能量平衡的角度,对某工作面巷道支护的防冲能力进行计算。结合"SOS"微震监测系统长期监测获得的冲击和强矿震数据,考虑微震系统的定位误差,引入防冲支护设计可靠度参数P(x),将工作面现有支护条件在不同P(x)时的计算可抵御震源能量与冲击时实际的震源能量进行比较分析,探讨微震反求支护参数方法的可行性。结果表明:强矿震在一定条件下可以转化为冲击,锚网索支护的"柔性吸能功能"能够吸收传递到锚固围岩上的大部分或部分冲击能量,保持锚固围岩的整体性和稳定性,对巷道内部围岩起到有效的支撑,避免巷道围岩的进一步破坏失稳,是有效控制冲击矿压的重要因素。结合可靠度参数P(x)的理论计算结果与历次冲击和强矿震数据具有较好的可比性,历次冲击时支护的计算可抵御震源能量随着P(x)的减小均存在从小于到大于实际震源能量的转折点,而强矿震的计算结果也和实际情况相符,说明结合P(x)的微震反求方法具有较好的可行性。
Based on the analysis of the occurring characteristics of rock burst and the anti-impact mechanism of bolt-net-anchor support. The anti-impact abilities of support were calculated from the perspective of the energy-absorbing property of support and energy balance theory. Taking account of the location deviation,the reliability parameter P(x) for anti-impact supporting design was introduced to the feasibility analysis of seismic reverse calculation for supporting,and the anti-impact energies of existing support calculated with the long-term data monitored by'SOS'seismic system were analyzed and compared with real energies of rock bursts in different P(x). Results show that strong tremors will turn into rock bursts under certain conditions. The flexible property of bolt-net-anchor support can absorb most or part of dynamic energy passed on to the anchoring zone,maintain the integrity and stability of the anchoring surrounding rock,support the internal surrounding rocks of roadway,and prevent the further failure of the surrounding rocks. This is an important factor in effective control of rock-burst. The theoretical calculation results combined with P(x) have good comparability with actual data of rock bursts and strong tremors. The calculated anti-impact energy of existing support of previous rock bursts all have turning points with the decrease of P(x),and the calculated result of the strong tremor also coincides with the reality. This shows that the seismic reverse calculation method combined with P(x) is feasible.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第S2期4125-4131,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
高等学校博士学科点专项科研基金新教师类课题(20120095120019)
江苏高校优势学科建设工程资助项目(SZBF2011–6–B35)
江苏省自然科学基金(BK20140194)
关键词
采矿工程
深部开采
巷道
支护
冲击
矿震
反求
mining engineering
deep mining
roadway
support
rock burst
tremor
reverse
