墩柱式结构充填底板应力传递特征及变形规律

doi:10.13722/j.cnki.jrme.2022.0909

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摘要为研究结构充填开采过程中充填体应力传递对底板岩层的影响，以沁水煤田长治矿区为例，利用相似原理构建充填体–底板复合结构模型，进行室内试验，并结合数值模拟，对不同充填体强度、不同充填间距条件下的墩柱式结构充填采空区顶底板移近量、底板破坏形态、塑性区范围进行研究。研究结果表明：(1) 浅层底板中充填体下应力集中最为明显，该应力以45°方向斜向下传递，引起水平应力，并最终扩散至底板全平面，越向下传递，垂直应力越小且分布越均匀，水平应力越大，充填间距变化对底板中应力水平影响显著；(2) 在墩柱式结构充填可承载范围内，顶板下沉量主要由充填体强度决定，底鼓量主要由充填间距决定，充填体强度、充填间距与顶底板移近量总体呈二元二次抛物曲面关系；(3) 本工况条件下充填柱下底板剪切滑移最大深度为2.38 m，该深度以上产生椭圆形剪切破坏塑性区，以下产生波浪型拉伸破坏塑性区，并最终穿越两层软弱岩层底板。研究结果可为墩柱式结构充填的合理设计方案提供依据。

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	王峰1
	2
	郭育霞1
	2
	3
	冯国瑞1
	2
	3
	解文硕1
	2
	叶晓莉1
	2
	马嘉辉1
	2

关键词 ：采矿工程；充填体&ndash, 底板复合结构；岩层控制；应力传递；底鼓变形

Abstract：In order to investigate the impact of stress transmission from the filling body on the underlying rock layer during the filling mining process，a composite structure model of the filling body-bottom plate was constructed using the similarity principle in a coal mine in Qinshui coalfield. The laboratory experiments and numerical simulations were carried out to study the movements of the top and bottom plates，the failure modes of the bottom plate，and the plastic zone ranges of the column-and-pillar filling mining under different filling body strengths and filling distances. The results indicate that：(1) the most significant stress concentration occurs under the filling body in the shallow bottom plate. This stress is diagonally transmitted downward at a 45° angle，causing horizontal stress and ultimately spreading to the entire bottom plate. As the stress transmits downward，the vertical stress becomes smaller and more uniform and the horizontal stress becomes larger. The change of filling distance has a significant impact on the stress level in the bottom plate. (2) Within the load-bearing range of the column-and-pillar structure filling，the amount of top plate sinking is mainly determined by the filling body strength，while the bottom bulge is mainly determined by the filling distance. The overall relationship between filling body strength，filling distance，and top and bottom plate movements is represented by a quadratic parabolic surface. (3) Under the current working conditions，the maximum depth of the filling column under the bottom plate shear slip is 2.38 m，above which an elliptical shear failure plastic zone is produced，and below which a wavy tensile failure plastic zone is produced，ultimately penetrating the bottom plate of the two weak rock layers. The research results can provide a basis for the rational design of column-and-pillar structure filling.

Key words： mining engineering backfill and floor composite structure rock formation control stress transfer deformation of the bass drum

引用本文:

王峰1，2，郭育霞1，2，3，冯国瑞1，2，3，解文硕1，2，叶晓莉1，2，马嘉辉1，2. 墩柱式结构充填底板应力传递特征及变形规律[J]. 岩石力学与工程学报, 2023, 42(5): 1237-1247.
WANG Feng1，2，GUO Yuxia1，2，3，FENG Guorui1，2，3，XIE Wenshuo1，2，YE Xiaoli1，2，MA Jiahui1，2. Stress transfer characteristics and deformation law of filling floor of #br# pier-column structure#br#. , 2023, 42(5): 1237-1247.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0909 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I5/1237

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