下向回采和充填顺序对采场稳定性影响的模拟研究

Stope Stability Influenced by Underhand-Stoping and Consolidated-Backfilling Sequence of Hexagonal-Drift with FLAC Simulation

以某矿下向六角形进路回采胶结充填采场为研究对象,根据现场实测工程地质力学数据,选取4种不同的进路回采和充填顺序,运用FLAC模拟分析进路周围介质应力场、位移场和塑性区分布,研究采场结构介质应力应变规律、几何变形特征和结构承载性能受不同采充顺序扰动的影响。研究结果表明:采场进路从中间开始回采、逐步向上盘推进,先上盘后下盘、分段回采充填的顺序,使采场结构介质稳定性受采充扰动影响较小,是安全可靠、技术可行、经济合理的。同时应注意加强上下盘进路腰部和底板围岩应力集中区的监控和支护,确保顶板充填体强度指标。

The stope of underhand-stoping and consolidated-filling by hexagonal-drift was investigative-object,according to the engineering geo-mechanics date from in-situ test,four different stoping and filling sequences of drift were selected,The stress,displacement and plasticity field of medium around drift were simulated and analyzed with FLAC,the stress-strain rule,geometry-distortion character and structure-load capability of stope tructure-medium influenced by the different stoping-filling sequences was investigated.The analytical results showed that,this stoping-filling sequence was safe,feasible and economical technical,which was the drift in the middle of stope was mined first,advanced to headwall step by step,excavated headwall first and footwall secondly,stoping and filling sublevel,the structure-medium stability of stope was influenced by mining and filling less.The inspection and shoring on the stress-focus position was at wall-rock and bottom-rock of headwall and footwall drift should be strengthened,the intensity index of top-filling-body should be ensured.