基于Mathews图解法的空场嗣后充填采场结构参数优化研究

阿舍勒铜矿采深逐渐接近1 000 m，深部矿岩破碎且采场应力增大，导致采场稳定性问题日益严重。为了确保阿舍勒铜矿深部采场稳定，保证回采作业安全，需要基于工程地质资料优化采场结构参数。本文通过现场调研，获取了地下典型矿岩的单轴抗压强度，测量了-100 m中段的地应力，并对地下矿岩进行了岩体质量分级，进而采用Mathews图解法，针对采场沿走向布置和垂直走向布置对顶板和边帮开展稳定性分析，基于工程地质资料合理选取了岩石应力系数、节理方位系数和重力调整系数等，得到Mathews稳定性系数和容许水力半径的相关关系，最终分析确定了保持采场稳定的最佳结构参数：当采场宽度小于24 m时，采场顶板总能保持稳定；采场垂直矿体走向布置且侧帮矿岩为黄铁矿时，采场长度须小于22.50 m，若侧帮为凝灰岩时，采场长度须小于12.50 m。相关结论可为阿舍勒铜矿采场结构参数优化提供依据，并能为国内同类矿山采场结构设计提供参考。

Optimization of structure parameters of empty field subsequent filling stope based on Mathews graphical method

The Ashele copper mine is gradually approaching a depth of 1 000 m, with deep ore fragmentation and increased stope stress, resulting in increasing stability problems in the stope. In order to ensure the stability of the deep stope of the Ashele copper mine and ensure the safety of the recovery operation, it is necessary to optimize the structural parameters of the stope based on the engineering geological data. Through on-site research, the uniaxial compressive strength of typical underground ore was obtained, the ground stress of the middle section of -100 m was measured, and the rock mass classification was carried out on the underground ore, and then the Mathews diagram method was used to analyze the stability of the top plate and the side gang for the directional layout and vertical direction layout of the stope, and the rock stress coefficient, joint azimuth coefficient and gravity adjustment coefficient were reasonably selected based on the engineering geological data, and the correlation between the Mathews stability coefficient and the allowable hydraulic radius was obtained. The final analysis determined the optimal structural parameters to keep the stope stable: when the stope width was less than 24 m, the stope roof was always stable; The length of the stope must be less than 22.50 m when the vertical ore body of the stope is arranged and the side ore is pyrite, and the length of the stope must be less than 12.50 m if the side gang is tuff. The relevant conclusions can provide a basis for the optimization of the structural parameters of the Ashele copper mine, and can provide a reference for the structural design of similar mines in China.