论文部分内容阅读
为了保证矿山安全高效的回采,采用理论研究与数值模拟手段,将膏体假顶力学模型简化为简支“梁”模型,揭示了膏体假顶强度与膏体假顶厚度及经济配筋率的变化规律,研究表明,膏体假顶的极限强度随着膏体假顶厚度的增大呈多项式降低,经济配筋率随膏体假顶强度增加呈对数增加。结合新疆某铜矿工程实际情况,并通过数值模拟技术,设计锯齿形膏体假顶,确定膏体假顶厚度为3 m,强度为6.78 MPa,经济配筋率为0.6%,纵筋选择12φ14@250布置。结果表明,膏体假顶在自重及上部充填体作用下,膏体假顶可以保证正常的工作,从而很好地验证了膏体假顶力学模型的可靠性。该研究成果对膏体假顶设计具有重要的指导意义。
In order to ensure the safe and efficient mining, a theoretical study and numerical simulation are adopted to simplify the mechanical model of the false top as a simple “beam” model. The results show that the strength of the false top and the thickness of the false roof and the economic distribution The results showed that the ultimate strength of the top of the plaster reduced in a polynomial manner with the increase of the thickness of the plaster top, and the economic reinforcement ratio increased logarithmically with the increase of the plaster top. Combined with the actual situation of a copper mine project in Xinjiang, the zigzag paste roof was designed by numerical simulation technology. The thickness of the paste roof was 3 m, the strength was 6.78 MPa, the economic reinforcement rate was 0.6% and the longitudinal bars were 12φ14 @ 250 layout. The results show that under the action of self-weight and the upper packing, the false top of the paste can ensure the normal work, and the reliability of the mechanical model of the false top is verified well. The research results have important guiding significance for the design of plaster roof.