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矿柱宽度和充填体自立高度是阶段嗣后充填顺利实施的重要影响因素。基于弹性力学平面应变基本假设,建立阶段嗣后胶结充填体矿柱力学模型并进行理论求解。以某铁矿为工程分析实例,采用控制变量法(CVM)研究矿柱不同宽度、高度条件下,水平应力和剪应力的变化规律。研究表明:矿房极限宽度和高度分别为19.8 m和103.2 m。胶结充填体矿柱水平应力随矿柱高度的增高而逐渐增大;剪应力在矿柱中心位置达到最大,且高度越大,剪应力值也越大。在胶结充填体矿柱与非胶结充填体接触侧剪应力趋于定值。矿柱宽度分别为15、18、20 m时,其剪应力分别为243.8、292.6、325.1 k Pa。而产生剪应力的主要原因是非胶结充填体受水平应力作用在与胶结充填体矿柱接触面产生滑动摩擦力所致。
The width of pillars and the height of filling body are the important influencing factors for the smooth implementation of subsequent filling. Based on the basic assumption of plane strain of elastic mechanics, the mechanics model of post-cementing post-grouting pillars was established and solved theoretically. Taking an iron mine as an example, the variation law of horizontal stress and shear stress under different width and height of pillars was studied by using control variable method (CVM). The research shows that the ultimate width and height of the mine are 19.8 m and 103.2 m respectively. The horizontal stress of cemented filler body pillars gradually increases with the height of pillars. The shear stress reaches the maximum at the center of pillars, and the greater the height, the greater the shear stress. The shear stress tends to set at the contact side of cemented filler body and non-cemented filler body. When the pillar width is 15, 18 and 20 m respectively, the shear stresses are 243.8, 292.6 and 325.1 kPa respectively. The main reason for the shear stress is that the non-cemented filler body is affected by the horizontal stress to generate sliding friction force at the contact surface with the cemented filler body ore column.