不同采场凿岩硐室跨度与岩性关系研究

深孔爆破开采容易产生岩体片帮与超采问题,导致采场跨度变大,影响采场稳定性。基于现代仿真技术对不同采场跨度下的地压显现进行了数值模拟,对比分析不同开采跨度下硐室顶板应力、位移、塑性区分布情况,探讨不同采场跨度与岩性的内在关联。研究表明:不同跨度矿柱水平位移变化不明显,随跨度的增加,顶板拉应力与沉降均增大,采场跨度增加,将导致顶板安全风险逐步增大。不同开采跨度下采场地压显现规律的研究具有一定的指导意义,可为工程实践中优化设计提供参考。

Research on the Relationship between Span and Lithology of Rock Drilling Chambers in Different Stopes

Deep-hole blasting mining is prone to rock slicing and over-exploitation, which leads to the increase of stope span and affects the stability of the stope. Based on modern simulation technology, numerical simulation of the ground pressure appearance of the stope under different spans is carried out, the distribution of stress, displacement and plastic zone of chamber roof under different mining span was compared and analyzed, discuss the internal relationship between different stope spans and lithology. Research shows: the horizontal displacement of the pillars of different spans does not change significantly, as the span increases, the tensile stress and settlement of the top plate increase, the increase in the stope span will lead to a gradual increase in the safety risk of the roof. The study of ground pressure behavior law under different mining span has certain guiding significance, which can provide reference for the optimization design in engineering practice.