褶曲构造影响区内工作面开采诱冲机理及其防治研究

杨增强; 刘畅; 宋洁; 白洋; 靳会武; 王大伟

doi:10.13272/j.issn.1671-251x.2022070073

褶曲构造影响区内工作面开采诱冲机理及其防治研究

doi: 10.13272/j.issn.1671-251x.2022070073

杨增强^{1, 2,},
刘畅³,
宋洁⁴,
白洋¹,
靳会武¹,
王大伟¹

1.
江苏建筑职业技术学院交通工程学院，江苏徐州　221116
2.
徐州矿务集团有限公司，江苏徐州　221018
3.
中煤科工开采研究院有限公司，北京　100013
4.
徐州市检验检测中心，江苏徐州　221111

基金项目: 中国博士后科学基金第73批面上资助项目（2023M732969）；国家自然科学基金项目（52104091）；国家重点研发计划项目（2020YFB1314002）；中煤科工开采研究院科创创新基金重点资助项目（KCYJY-2021-ZD-02）。

详细信息

作者简介:
杨增强（1987— ），男，山西长治人，讲师，博士，主要从事冲击地压灾害防治相关的研究工作，E-mail：iceiceice185@163.com

中图分类号: TD324
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出版历程
- 收稿日期: 2022-07-26
- 修回日期: 2023-10-06
- 网络出版日期: 2023-10-26

Research on the mechanism and prevention of mining induced erosion in the working face affected by fold structures

1.
School of Transportation Engineering, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, China
2.
Xuzhou Coal Mining Group Co., Ltd., Xuzhou 221018, China
3.
CCTEG Coal Mining Research Institute, Beijing 100013, China
4.
Xuzhou Inspection Testing Center, Xuzhou 221111, China

摘要

摘要: 针对褶曲构造影响区内不同工作面的倾角变化所引起的矿压显现特征多变性问题，以宝积山煤矿七采区为工程背景，采用现场调研、理论分析、数值模拟和现场工业性试验相结合的方法，对倾角变化煤层内不同工作面开采期间动静载荷进行了研究。结果表明：① 煤岩组合系统刚度值大于0的累积声发射（AE）能量较煤岩组合系统刚度值小于0的累积AE能量小，说明煤岩组合系统刚度值小于0时更易累积AE能量，且在煤岩组合系统刚度值小于0时，其绝对值越大越能够积聚更高的AE能量。② 随着煤层倾角递增，沿空巷道实体煤侧内集中静载荷降低，煤柱侧内集中静载荷增高，高位厚硬关键层发生破断所需悬顶段更长。③ 煤层倾角较小时，动静载叠加作用下沿空巷道两帮内煤岩组合系统极易诱发动态破坏II型冲击地压。煤层倾角较大时，高集中静载作用下沿空巷道煤柱侧内煤岩组合系统极易诱发静态破坏型或动态破坏I型冲击地压。④ 705综放工作面开采期间沿空巷道煤柱侧极易诱发静态破坏型或动态破坏I型冲击地压，对其实施防冲措施后的电磁辐射值降幅高达67.3%，煤岩组合系统不易诱发冲击地压。
- 煤层开采 /
- 褶曲构造 /
- 煤层倾角 /
- 冲击地压 /
- 近场动载扰动 /
- 远场动载扰动
Abstract: The changes in dip angles of different working faces in the area affected by folding structures cause the variability of mining pressure features. In order to solve the above problem, with the seventh mining area of Baojishan Coal Mine as the engineering background, a combination of on-site research, theoretical analysis, numerical simulation, and on-site industrial experiments is used. The dynamic and static loads during mining of different working faces in coal seams with varying dip angles are studied. The results indicate the following points. ① The accumulated acoustic emission(AE) energy of the coal rock composite system with a stiffness value greater than 0 is smaller than that of the coal rock composite system with a stiffness value less than 0. This indicates that when the stiffness value of the coal rock composite system is less than 0, AE energy is more likely to accumulate. When the stiffness value of the coal rock composite system is less than 0, the larger its absolute value, the higher the AE energy can be accumulated. ② As the dip angle of the coal seam increases, the concentrated static load inside the solid coal side of the goaf roadway decreases, and the concentrated static load inside the coal pillar side increases. The hanging top section required for the cracking of the high and thick hard key layer is longer. ③ When the dip angle of the coal seam is small, the combined system of coal and rock in the two sides of the goaf roadway is prone to inducing dynamic failure type II rock burst under the combined action of dynamic and static loads. When the dip angle of the coal seam is large, the coal rock combination system inside the coal pillar side of the goaf roadway is prone to inducing static or dynamic failure type I rock burst under high concentrated static load. ④ During the mining period of the 705 fully mechanized top coal caving face, the coal pillar side of the goaf roadway is prone to inducing static or dynamic failure type I rock burst. After implementing anti erosion measures, the electromagnetic radiation value decreases by up to 67.3%. The coal rock combination system is not easy to induce rock burst.
- coal seam mining /
- fold structure /
- coal seam dip angle /
- rock burst /
- near field dynamic load disturbance /
- far field dynamic load disturbance

HTML全文

图 1 七采区内工作面剖面位置关系

Figure 1. Position relationship of working face profile in seven mining area

下载: 全尺寸图片幻灯片

图 2 不同刚度条件下煤岩组合系统应力及AE能量变化规律

Figure 2. Stress and AE energy variation law of coal rock combination system under different stiffness conditions

下载: 全尺寸图片幻灯片

图 3 煤层倾角为α时的平面应变力学模型

Figure 3. A plane strain mechanical model of when coal seam dip angle is α

下载: 全尺寸图片幻灯片

图 4 煤体对基本顶的反向支承应力分布曲线

Figure 4. Reverse support stress distribution curve of coal body to basic roof

下载: 全尺寸图片幻灯片

图 5 高位厚硬关键层受力模型

Figure 5. Force model of high and thick hard key layer

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图 6 厚硬关键层破断时的最小悬顶段长度变化曲线

Figure 6. Change curve of minimum suspended top section length when thick and hard key layer is broken

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图 7 低位基本顶岩层受力学模型

Figure 7. Mechanical model of low basic top strata

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图 8 基本顶岩层破断位置的水平间距变化曲线

Figure 8. Horizontal spacing change curve of the breaking position of the basic roof strata

下载: 全尺寸图片幻灯片

图 9 滑落和回转失稳系数变化曲线

Figure 9. Variation curve of sliding and slewing instability coefficient

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图 10 实体煤侧工作面内垂向应力空间分布云图

Figure 10. Spatial distribution nephogram of vertical stress in the working face of solid coal side

下载: 全尺寸图片幻灯片

图 11 煤柱侧护巷煤柱体内垂向应力空间分布云图

Figure 11. Spatial distribution nephogram of vertical stress in coal pillar body of coal pillar side protection roadway

下载: 全尺寸图片幻灯片

图 12 现场工业性试验方案

Figure 12. Site industrial test plan

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图 13 煤柱侧电磁辐射监测结果

Figure 13. Monitoring results of electromagnetic radiation at coal pillar side

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表 1 煤岩层物理力学参数

Table 1. Physical and mechanical parameters of coal and rock strata

岩性	厚度/ m	密度/ （kg·m⁻³）	体积模量/GPa	剪切模量/GPa	内摩擦角/（°）	内聚力/MPa
粗砂岩	−	2 620	11.9	10.2	33	9.3
细砂岩	6	2 750	13.6	11.5	38	10.5
粉砂岩	7	2 600	8.9	7.4	35	6.8
细砂岩	4	2 750	13.6	11.5	38	10.5
1号煤	8	1 350	3.3	2.7	29	2.1
泥岩	21	2 540	8.4	5.7	36	8.2
砂砾岩	16	2 340	12.3	9.1	37	5.2
粉砂岩	−	2 650	9.1	7.8	34	7.2

下载: 导出CSV

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