强动压高水平应力巷道围岩控制技术
Control Technology of Roadway Surrounding Rock with Strong Dynamic Pressure and High Horizontal Stress
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摘要: 为了解决强动压高水平应力巷道支护难题,根据地应力测试、顶板取心探测、岩体原位强度测试并结合FLAC3D数值模拟,研究了巷道在强动压高水平应力作用下的破坏机理,进而应用高预应力强力支护技术进行巷道支护,并进行现场试验和矿压监测。结果表明:强动压高水平应力导致巷道两帮由浅到深逐渐剪切破坏,其承载能力减弱导致顶板失稳;强动压高水平应力加剧顶板剪切错动,造成顶板锚固结构失稳,致使顶板松散破碎;提出“固帮控顶”的围岩控制思路,即采用高强度预应力“锚+梁+网”联合支护方案加固两帮和顶板,与原支护相比,表面位移明显减小,围岩控制取得良好效果。Abstract: To solve the problem of strong dynamic and high horizontal stress about roadway support, based on in-situ stress test, roof coring detection, in-situ strength test of rock mass and FLAC3D numerical simulation, the failure mechanism of roadway under the action of high horizontal stress under strong dynamic pressure was studied, and then the high prestress strong support technology was applied for roadway support, and field test and mine pressure monitoring were conducted. The results showed that: intensely dynamic and high horizontal pressure leads to the gradual shear failure of the two sides of the roadway from shallow to deep, the decrease of the bearing capacity leads to the instability of the roof; intensely dynamic and high horizontal pressure aggravats roof shear dislocation, which leads to the unstability of roof anchorage structure and roof was loose breakage finally; the idea of “roadsides reinforcement and roof control” was proposed, which used combined support scheme of “anchor + beam + net” to reinforce two roadsides and control roof. Compared with the original support, the surface displacement was reduced obviously and the control effect of surrounding rock was remarkable.
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