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在分析下向进路分层无分段充填法的基础上,对某矿采用单一巷道进路式回采建立了上覆充填体力学模型,为避免人工假顶出现“悬臂梁”状态,最终确定“嵌固梁”模型作为该充填采矿法上覆充填体力学模型。依据弹塑性力学知识计算出充填体承载层厚度为0.92 m,得到了充填体最大挠度值为23.4 cm。结合工程实际,采用FLAC3D数值模拟软件研究了不同采深下采场围岩与充填体塑性区及应力分布规律,研究结果表明:除首采层以外,其余分层上覆承载层均没有发生塑性破坏,且各分层充填体所受最大主应力均没有达到其抗压强度,所选承载层厚度及充填料浆配比所得参数能够保证充填体稳定性。研究成果可为破碎围岩薄矿体实现安全高效开采提供理论依据。
Based on the analysis of the non-segmented filling approach to the stratification of roads, a mechanical model of superstructure overburden was established for a mine with a single roadway, and in order to avoid the “cantilever” state of the artificial roof, Finally, the “embedded beam” model is established as the mechanical model of the overburden with the overburden mining method. According to the knowledge of elastic-plastic mechanics, the thickness of the bearing layer of filling body is calculated as 0.92 m, and the maximum deflection value of the filling body is 23.4 cm. Combined with engineering practice, the FLAC3D numerical simulation software was used to study the plastic zone and stress distribution of surrounding rock and filling body under different mining depth. The results show that the plasticity And the maximum principal stress suffered by each layered filling body did not reach its compressive strength. The selected bearing layer thickness and the parameters of filling slurry ratio can ensure the stability of the filling body. The research results can provide a theoretical basis for the realization of safe and efficient mining of thin-wall rock mass.