Cooperative load‐bearing characteristics of a pillar group and a gob pile in partially caved areas at shallow depth,Energy Science & Engineering

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Cooperative load‐bearing characteristics of a pillar group and a gob pile in partially caved areas at shallow depth
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-11-12 , DOI: 10.1002/ese3.511
Defu Zhu _{1,

2} , Xuanmin Song ₁ , Haocheng Li ₁ , Zhenghe Liu ₁ , Chen Wang ₃ , Yuming Huo ₁

Affiliation

Stress concentration in partially caved goaf is the main cause of dynamic pressure accident in the lower seam mining. Aimed at the characteristics of caving in shallow partially caved goaf (PCG) and the specificity of interior load‐bearing structures, a classification criterion of goaf caving was proposed. The characteristics of cooperative load‐bearing in pillar group and gob pile were revealed by numerical calculation, physical simulation, and theoretical analysis. Taking intermittent mining as an example, combined with the deformation behaviors of the main roof and the loading characteristics of waster rock mass, the characteristics of the load‐bearing of gob piles were described in the form of a piecewise function. A FLAC3D model of intermittent mining is modeled to evaluate the stability of pillars, the long‐term stability and distribution laws of overlying loads were revealed through a refined model. The results show that the width of the caved zone bearing the load in the intermittent goaf is about 20 m, and the maximum load‐bearing capacity is 1.055 MPa. The maximum depth of the plastic region in one side of the pillar is 1.48 m, and the load on elastic zone is about 11.33 MPa. This study provides a method for the study of the caving characteristics and load uncertainty in PCG, and the results provide important theoretical values for the safe mining of lower coal seams.

中文翻译：

浅埋部分陷落区域的一个支柱群和一个料滴桩的协同承载特性

下陷煤层中采空区应力集中是动压事故的主要原因。针对浅层部分采空区崩落特征和内部承重结构的特殊性，提出了采空区崩落分类标准。通过数值计算，物理模拟和理论分析，揭示了桩群与采空区群协同荷载的特征。以断续开采为例，结合主顶板的变形特性和of石的荷载特性，以分段函数的形式描述了料滴的承载特性。建立了FLAC3D间歇开采模型，以评估支柱的稳定性，通过改进的模型揭示了上覆荷载的长期稳定性和分布规律。结果表明，间歇采空区中承载载荷的陷落带宽度约为20 m，最大承压能力为1.055 MPa。立柱一侧塑性区域的最大深度为1.48 m，弹性区域的载荷约为11.33 MPa。该研究为研究PCG的崩落特性和载荷不确定性提供了一种方法，其结果为安全开采下煤层提供了重要的理论价值。立柱一侧塑性区域的最大深度为1.48 m，弹性区域的载荷约为11.33 MPa。该研究为研究PCG的崩落特性和载荷不确定性提供了一种方法，其结果为安全开采下煤层提供了重要的理论价值。立柱一侧塑性区域的最大深度为1.48 m，弹性区域的载荷约为11.33 MPa。该研究为研究PCG的崩落特性和载荷不确定性提供了一种方法，其结果为安全开采下煤层提供了重要的理论价值。

更新日期：2019-11-12

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