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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 occurrence of rock burst and the mechanism of scouring and protecting of anchor net, the anti-scuffing ability of roadway support in a working face is calculated from the viewpoint of flexible energy absorption and energy balance of the supporting member. Combined with long-term monitoring of the impact and strong mine-shock data obtained by the “SOS” microseismic monitoring system, considering the positioning error of the microseismic system, the design reliability parameter P (x) of the anti-puncturing support is introduced, and the existing support conditions The calculation of different P (x) can resist the source energy and the actual source energy during impact analysis, and discuss the feasibility of microseismic reverse support parameters. The results show that strong earthquakes can be transformed into shocks under certain conditions. The “flexible energy absorption function” supported by the anchor net can absorb most or part of the impact energy transferred to the anchoring surrounding rock and keep the anchoring surrounding rock Integrity and stability of the surrounding rock within the tunnel to play an effective support to avoid further destruction of roadway rock instability is an important factor in controlling rock burst effectively. Combining the theoretical results of reliability parameter P (x) with those of previous shocks and strong earthquakes, the calculation of support during each impact can resist that the source energy decreases with the decrease of P (x) At the turning point larger than the energy of the actual source, the calculation result of strong earthquakes also agrees with the actual situation, which shows that the microseismic reverse method combined with P (x) is feasible.