切顶卸压沿空留巷围岩变形规律研究
Study on deformation law of surrounding rock of gob side-entry retaining by roof cutting and pressure relief
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摘要: 沿空留巷围岩剧烈的矿压显现已成为煤矿安全高效生产的瓶颈，切顶卸压作为能够有效降低巷道压力的有效措施之一，受到了越来越多的关注。以王庄煤矿91-101工作面风巷为工程背景，采用理论分析和数值模拟相结合的方法，研究了新型切顶卸压沿空留巷围岩竖向位移变化规律、应力及塑性区的分布特征，揭示了切顶高度对围岩变形影响规律。研究结果表明：新型切顶技术效果显著，巷道采空侧位移比未断顶时减小了46.7%，最佳切顶高度为19 m；现场沿空留巷顶底板和两帮平均移近量分别为312 mm和128 mm，留巷变形得到有效控制。Abstract: The severe mining pressure of surrounding rock along goaf retaining roadway has become the bottleneck of safe and efficient production of coal mine. As one of the effective measures to effectively reduce roadway pressure, roof cutting and pressure relief has received more and more attention. Taking the wind tunnel of 91-101 working face of Wangzhuang Coal Mine as the engineering background, the variation rules of vertical displacement of surrounding rock, the distribution characteristics of stress and plastic zone along gob retaining roadway under pressure of new roof cutting are studied by combining theoretical analysis and numerical simulation, and the influence law of roof cutting height on surrounding rock deformation is revealed. The research results show that the effect of the new roof cutting technology is remarkable, the side displacement of roadway goaf is reduced by 46.7% compared with that of unbroken roof, and the optimal roof cutting height is 19 m. The average displacement of roof, floor and two sides of gob-side entry retaining is 312 mm and 128 mm respectively, and the deformation of entry retaining is effectively controlled.
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