摘要
通过UDEC3.1数值模拟,针对姚桥煤矿7521工作面正巷掘进的3种情况进行了分析：先掘后采时,7521正巷围岩受一次采动影响,对巷道的影响较小;先采后掘时,7521正巷围岩受二次采动影响,是在一次采动稳定后再受到二次采动,对巷道的影响较大;边掘边采时,7521正巷围岩受二次采动影响,但是在一次采动未稳定时就受到二次采动,会产生应力叠加,对巷道的影响非常大。通过对现场矿压显现情况及巷道表面位移曲线,分析出采用先掘后采的方案最有利于巷道维护。
Abstract
Three different situations of 7521 coal face tunnel driving of Yaoqiao coal mine were simulated using UDEC.Numerical results show that 7521 tunnel surrounding rock mass has once mining influence and little effects produced to tunnel when driving ahead of mining;7521 tunnel surrounding rock mass has twice mining influence,and the second mining occurred after first mining when mining ahead of driving,the influence to tunnel is much greater;under the condition of driving and mining at same time,7521 tunnel surrounding rock mass has twice mining influence,but the stress superposition would produced as effected by twice mining when the first was still unsteady,so the influence to tunnel was great.Site mine pressure situation and tunnel surface displacement curves show that driving ahead of mining scheme was most beneficial to the stability of tunnel.
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