阶段出矿底部桃形矿柱的结构参数数值计算分析

发布时间：2018-07-16 14:40

【摘要】：针对某矿采用阶段空场崩落联合采矿法开采急倾斜极厚大矿体时存在存窿矿量多、矿石贫化损失大、空区作业危险等难题,提出了具有底部出矿结构的桃形矿柱采矿新方案。结合该矿区生产实际,设计了6种桃形矿柱方案,采用ABAQUS数值模拟软件,依据M-C准则建立桃形矿柱的弹塑性本构模型,分别分析了冲击荷载作用下桃形矿柱的应力、应变、位移响应,以及残余完整巷道长度与垂高的关系。结果表明,坡面角50°、桃形矿柱高度15 m的方案受力状态最理想,且拉伸应变及位移均较小并集中于坡脚,但完整巷道的垂高不足2 m;坡面角70°方案的桃形矿柱塑性区和破坏区范围均大于坡面角60°方案,二者的完整巷道长度与垂高均在可靠范围。经综合考虑,优选坡面角60°、桃形矿柱高度15 m方案为桃形矿柱的最优参数。
[Abstract]:In view of the problems in mining steep and extremely thick orebodies by the combined mining method of stage caving and caving in a certain mine there are many problems such as large amount of ore deposit large loss of ore dilution and danger of operation in the empty area. A new mining scheme of peach pillar with bottom ore drawing structure is put forward in this paper. Based on the production practice of the mine, six kinds of peach pillar schemes are designed. By using Abaqus numerical simulation software, the elastic-plastic constitutive model of peach pillar is established according to M-C criterion, and the stress and strain of peach pillar under impact load are analyzed respectively. Displacement response, and the relationship between the length of residual complete roadway and the vertical height. The results show that the optimum stress state of the scheme is that the slope angle is 50 掳, the height of the peach pillar is 15 m, and the tensile strain and displacement are both small and concentrated at the foot of the slope. However, the vertical height of the complete roadway is less than 2 m, and the plastic zone and the damage area of the peach pillar in the slope angle 70 掳scheme are both larger than that of the slope angle 60 掳scheme, and the complete roadway length and the vertical height of both are in the reliable range. After comprehensive consideration, the optimum selection of slope angle 60 掳and the height of peach pillar 15 m is the optimum parameter of peach pillar.
【作者单位】：中南大学资源与安全工程学院;重庆大学煤炭灾害动力学与控制国家重点实验室;重庆大学资源及环境科学学院;
【基金】：重庆市基础科学与前沿技术研究专项(cstc2016jcyj A1861) 国家自然科学基金青年基金(51774058,51504044)
【分类号】：TD853

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