采动影响下沿空掘巷围岩稳定性研究

Study on the Stability of Surrounding Rock Roadway Driving along Next Goaf under Mining Impact

摘要: 在矿井开采过程中，沿空掘巷因其能够提高回采效率、优化通风系统而被广泛应用，但其围岩稳定性易受采动影响，存在较大安全风险。针对色连二矿12411工作面沿空掘巷围岩稳定性问题，本文综合运用理论计算与数值模拟方法对留设煤柱的合理宽度及其稳定性进行研究，并进行现场工业性试验，检测回采期间巷道围岩变形量。研究结果表明：① 基于极限平衡理论，结合矿井实际地质条件，计算得出合理的留设煤柱宽度为11 m。② 利用FLAC3D数值模拟软件，对12411工作面回采60 m后的沿空掘巷围岩应力分布以及塑性区演化特征进行模拟分析。数值模拟结果显示，在采动影响下，煤柱能够有效承载围岩应力，降低巷道变形量。③ 回采期间巷道顶板最大位移量为171 mm，两帮最大位移量为140 mm，巷道变形量较小，保证了煤矿的安全开采。

Abstract: In the process of mining, roadway driving along next goaf is widely used due to its ability to improve mining efficiency and optimize ventilation systems. However, its surrounding rock stability is easily affected by mining activities, posing significant safety risks. In response to the stability problem of the surrounding rock of the 12411 working face in the Silian Second Mine, this paper comprehensively uses theoretical calculation and numerical simulation methods to study the reasonable width and stability of the reserved coal pillars, and conducts on-site industrial tests to detect the deformation of the surrounding rock of the roadway during the mining period. The research results indicate that: ① Based on the limit equilibrium theory and combined with the actual geological conditions of the mine, a reasonable width of 11 meters for retaining coal pillars is calculated. ② Using FLAC3D numerical simulation software, the stress distribution and plastic zone evolution characteristics of the surrounding rock along the goaf after 60 meters of mining in the 12411 working face are simulated and analyzed. The numerical simulation results show that under the influence of mining, coal pillars can effectively bear the stress of surrounding rock and reduce the deformation of the roadway. ③ During the mining period, the maximum displacement of the roadway roof was 171 mm, and the maximum displacement of the two sides was 140 mm. The deformation of the roadway was relatively small, ensuring the safe mining of the coal mine.