水岩作用下区段煤柱合理宽度研究

孔繁龙; 刘敬东; 田灵涛; 张智强; 王冬冬; 郑志强; 徐强

doi:10.13272/j.issn.1671-251x.2022060062

水岩作用下区段煤柱合理宽度研究

doi: 10.13272/j.issn.1671-251x.2022060062

孔繁龙^{1, 2,},
刘敬东¹,
田灵涛¹,
张智强¹,
王冬冬¹,
郑志强¹,
徐强^2, ,

1.
国电建投内蒙古能源有限公司察哈素煤矿, 内蒙古鄂尔多斯　017209
2.
中国矿业大学矿业工程学院, 江苏徐州　221116

基金项目: 国家自然科学基金资助项目（51874283）。

详细信息

作者简介:
孔繁龙（1985—），男，内蒙古鄂尔多斯人，工程师，硕士，主要从事煤矿地质防治水方面的工作，E-mail：k405365518@163.com

通讯作者:
徐强（1992—），男，山东邹城人，博士研究生，主要研究方向为矿山压力与岩层控制，E-mail：1101119112@qq.com

中图分类号: TD822.3
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出版历程
- 收稿日期: 2022-06-16
- 修回日期: 2022-12-07
- 网络出版日期: 2022-10-11

Study on reasonable width of coal pillar under water-rock interaction

1.
Chahasu Coal Mine, Guodian and Jiantou Inner Mongolia Energy Investment Co., Ltd., Erdos 017209, China
2.
School of Mines, China University of Mining and Technology, Xuzhou 221116, China

摘要

摘要: 采空区积水与煤岩作用会弱化区段煤柱强度而引起煤柱逐渐破坏和失效，水岩作用是区段煤柱合理宽度设计必须考虑的关键因素。以内蒙古鄂尔多斯新街矿区某矿31采区与33采区间煤柱留设为工程背景，开展了单轴压缩实验和理论分析，结果表明：水岩作用对煤体强度参数弱化产生显著影响，区段煤柱积水侧塑性区宽度随煤体强度弱化程度的增加而扩大；基于区段煤柱保持稳定的基本条件，计算得到区段煤柱合理的理论宽度为53.62 m。利用FLAC3D模拟了水岩作用的过程，分析了不同宽度煤柱的稳定性特征，结果表明：煤柱宽度较小时，采空区积水弱化作用对较高应力集中的弹性核区具有更强的破坏能力；随着煤柱宽度的增大，弹性核区应力集中程度降低，采空区积水侧垂直应力低于原岩垂直应力的区域范围则有所增大，煤柱两侧应力集中分布趋于均匀，采空区积水弱化作用对弹性核区的影响不再显著。综合理论计算与数值模拟结果，确定区段煤柱宽度为70 m。工程应用结果表明，70 m宽留设煤柱可以有效承载顶板压力，巷道围岩变形小，锚索受力稳定，保障了矿井安全生产。
- 区段煤柱 /
- 水岩作用 /
- 煤柱宽度 /
- 煤柱强度 /
- 采空区积水 /
- 塑性区
Abstract: The water accumulation in goaf and coal rock interaction will weaken the strength of the coal pillar in the section and cause gradual destruction and failure of the coal pillar. The interaction of water and rock is the key factor that must be considered in the design of the reasonable width of the coal pillar. The uniaxial compression experiment and theoretical analysis are carried out based on the engineering background of the coal pillar design between mining area 31 and 33 of a mine in Xinjie mining area, Ordos, Inner Mongolia. The results show that water-rock interaction has a significant impact on the weakening of coal strength parameters. The width of the plastic zone at the side of the water accumulation in the section coal pillar expands with the increase of the weakening degree of the coal body strength. Based on the basic conditions for the stability of the section coal pillar, the reasonable theoretical width of the section coal pillar is 53.62 m. Using FLAC3D to simulate the process of water-rock interaction, the paper analyzes the stability characteristics of coal pillar with different widths. The results show that when the width of the coal pillar is small, the weakening effect of water accumulation in goaf has stronger destructive capability to the elastic core area with higher stress concentration. With the increase of coal pillar width, the stress concentration degree in the elastic core area decreases. The area where the vertical stress at the water accumulation side of the goaf is lower than that of the original rock increases. The stress concentration distribution on both sides of the coal pillar tends to be uniform, and the weakening effect of water accumulation in the goaf on the elastic core area is no longer significant. Based on the results of theoretical calculation and numerical simulation, the width of coal pillar is determined to be 70 m. The engineering application results show that the coal pillar with width of 70 m can effectively bear the roof pressure. The deformation of the roadway surrounding rock is small, the stress of the anchor cable is stable, and the safety production of the mine is guaranteed.
- section coal pillar /
- water-rock interaction /
- coal pillar width /
- coal pillar strength /
- water accumulation in goaf /
- plastic zone

HTML全文

图 1 工作面布置

Figure 1. Layout of working face

下载: 全尺寸图片幻灯片

图 2 煤样应力−应变曲线及破坏形态

Figure 2. Stress-strain curves and failure mode of coal sample

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图 3 31301工作面回采后煤柱塑性区分布

Figure 3. Distribution of plastic zone after 31301 working face mining

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图 4 煤柱宽度为50，56 m时塑性区分布

Figure 4. Distribution of plastic zone when the width of coal pillar is 50 m and 56 m

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图 5 煤柱宽度为62 m时塑性区分布

Figure 5. Distribution of plastic zone when the width of coal pillar is 62 m

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图 6 煤柱宽度为68 m时塑性区分布

Figure 6. Distribution of plastic zone when the width of coal pillar is 68 m

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图 7 煤柱宽度为74 m时塑性区分布

Figure 7. Distribution of plastic zone when the width of coal pillar is 74 m

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图 8 煤柱应力分布云图

Figure 8. Nephogram of coal pillar stress distribution

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图 9 垂直应力集中系数分布曲线

Figure 9. Vertical stress concentration coefficient distribution curve

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图 10 33301回风巷矿压显现规律

Figure 10. Mine pressure behavior law of 33301 return airway

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表 1 数值计算模型煤岩体物理力学参数

Table 1. Physical and mechanical parameters of coal and rock mass in numerical calculation model

岩层	厚度/m	弹性模量/GPa	泊松比	黏聚力/MPa	内摩擦角/(°)	抗拉强度/MPa
粉砂岩	34	3.51	0.17	5.16	34.58	1.500
细粒砂岩	8	1.61	0.17	4.37	31.83	0.510
粉砂岩	34	5.86	0.15	5.66	36.00	0.890
中粒砂岩	6	3.45	0.09	4.24	31.34	0.480
砂质泥岩	26	5.35	0.19	6.26	37.44	1.080
泥岩	2	6.30	0.19	4.92	33.83	0.670
煤	6	0.99	0.21	3.05	26.09	0.610
煤（浸水）	—	0.49	0.21	0.42	9.53	0.004
泥岩	6	6.75	0.18	5.80	31.77	0.680
粉砂岩	26	4.69	0.17	6.46	33.58	0.860

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