嗣后充填多矿柱同时回采充填体侧向位移研究

以3个矿柱同时回采为例,运用FLAC^3D建立了有限元模型并进行分析,采用控制变量法研究了在不同的矿柱一次回采高度、矿柱跨度、矿房宽度和充填体强度条件下充填体侧向位移的变化规律。结果表明,3个矿柱同时回采时,充填体双侧侧向位移值大于单侧侧向位移值,充填体侧向位移最大值出现在回采矿柱高度中间位置,由靠近中央位置向两端逐渐减小; 充填体最大侧向位移值随着矿柱跨度和一次回采高度增加不断增大,与矿房宽度和充填体强度呈负相关,充填体侧向位移的影响敏感程度由大到小顺序为: 矿房宽度、矿柱跨度、一次回采高度及充填体强度。

Lateral Displacement of Backfill Body in Multiple Pillars Extraction After Cut and Fill Mining

A finite element model was constructed using FLAC^3D and adopted to analyze the case of simultaneous extraction of three pillars. The variation law of lateral displacement of backfill bodies in the case of simultaneous extraction of three pillars under the condition of different extraction height, pillar width, room width and strength of backfill bodies was investigated by adopting control variate method. The result shows that when three pillars are extracted at the same time, the lateral displacement on the both sides of middle backfill body is larger than the lateral displacement on the outward side of other two backfill bodies on both sides. The maximum lateral displacement occurs when the pillar is extracted to the middle height, and increases with the increasing of pillar width and primary extraction height, but presents a negative correlation with the room width and the strength of backfill body. The following factors for the lateral displacement of backfill body are listed in descending order of influence: room width, pillar width, primary extraction height and strength of backfill body.