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深部高应力巷道岩爆灾变机理及其控制对策研究,是目前国内外采矿工程所急待解决的重点难题.应用UDEC计算程序,分析了深部圆巷随开挖半径大小、应力水平高低和应力不均匀程度,围岩内主应力分布和能量耗散特征,发现随应力水平由低至高和应力不均匀程度的加剧,巷道围岩能量耗散值和能量耗散率均成凹形特征曲线急增;随开挖半径由小至大,能量耗散值成凹形曲线急增,但能量耗散率变化却很小;随着应力水平不均匀程度的加剧,在巷道围岩内部形成的主应力差值封闭包核区,呈现由围岩浅部向围岩深部跃移现象;当水平应力大于垂直应力时,在巷道顶板产生主应力差值封闭包核区的范围和量值大小,相对于巷道两帮更为严重.
The research on the mechanism of rockburst and its control in deep high stress roadway is a key problem that urgently needs to be resolved in mining engineering at home and abroad.Based on the UDEC calculation program, it is analyzed that the radius, the stress level and the stress The degree of evenness, the distribution of main stress in the surrounding rock and the energy dissipation characteristics, it is found that with the increasing of stress level from low to high and the stress nonuniformity increasing, the energy dissipation value and energy dissipation rate of the surrounding rock of the roadway increase sharply as the concave characteristic curve ; With the excavation radius from small to large, the energy dissipation value is concave curve sharp increase, but the energy dissipation rate change is very small; with the stress level increases, the main stress formed in the tunnel surrounding rock When the horizontal stress is greater than the vertical stress, the range and magnitude of the main stress difference in the closure nucleus of the roadway are produced. As a result, Roadway two gang more serious.