西藏甲玛铜多金属矿充填体热-流-力多场耦合模拟研究

Simulation Study on Backfill Based on Thermal-Seepage-Mechanical Fields Coupled of Tibetan Jia⁃ma Copper Polymetallic Ore

充填体的稳定性关乎采场回采的安全,其稳定性主要取决于其力学性能。充填体力学性能的形成过程涉及热过程、渗流过程和力学过程,为研究高海拔寒冷环境下充填体的稳定性,通过建立合理有效的多场耦合模型,采用热—流—力耦合方法对充填体稳定性进行定量研究。结果表明,采场中的应力自充填体上表面至底板逐渐增加;采场中的位移自充填体上表面至底板逐渐减小;部分三维截线穿过了采场不规则结构,导致应力集中,采场几何形状对于充填体应力及位移有较大的影响。

The stability of backfill is related to the safety of stope mining,and its stability mainly de⁃pends on its mechanical properties.The formation process of mechanical properties of backfill involves ther⁃mal process,seepage process and mechanical process.In order to study the stability of backfill in high alti⁃tude and cold environment,a reasonable and effective multi-field coupling model is established,and ther⁃mal-fluid-force coupling method is adopted to quantitatively study the stability of backfill.The results show that the stress in the stope increases gradually from the top surface of the backfill body to the bottom plate;the displacement in the stope gradually decreases from the top surface of the backfill body to the bot⁃tom plate;part of the three-dimensional section line passes through the irregular structure of the stope,re⁃sulting in stress concentration,the stope geometry has a great influence on the stress and displacement of the backfill.