围压与冲击扰动作用下组合煤岩超低摩擦效应分析

李利萍; 吴金鹏; 鞠翔宇; 王淋

doi:10.12090/j.issn.1006-6616.2019.25.06.093

围压与冲击扰动作用下组合煤岩超低摩擦效应分析

doi: 10.12090/j.issn.1006-6616.2019.25.06.093

1.
辽宁工程技术大学力学与工程学院, 辽宁阜新 123000
2.
大连海事大学交通运输工程学院, 辽宁大连 116000

基金项目:

国家重点研发计划 2016YFC0600901

国家重点研发计划 2017YFC0804208

国家自然科学基金项目 51874165

国家自然科学基金项目 51974148

辽宁省"兴辽英才计划"项目 XLYC1807130

详细信息

作者简介:
李利萍(1983-), 女, 博士, 副教授, 主要从事深部岩体力学特性方面的教学与研究工作。E-mail:llpah@126.com

中图分类号: TD324
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- 被引次数: 0
出版历程
- 收稿日期: 2018-10-15
- 修回日期: 2019-09-10
- 刊出日期: 2019-12-28

ANALYSIS OF ULTRA-LOW FRICTION EFFECT OF COAL-ROCK COMBINATION BLOCK UNDER CONFINING PRESSURE AND IMPACT DISTURBANCE

1.
School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China
2.
School of Transportation and Engineering, Dalian Maritime University, Dalian 116000, Liaoning, China

摘要

摘要: 深部煤岩在垂直扰动作用下发生振动，当水平冲击足以克服块体间摩擦阻力时，极易发生超低摩擦型冲击地压。文章以细砂岩-煤-细砂岩组合块体为研究对象，考虑顶板-煤-底板临近工作面开采工况，采用数值模拟方法，建立围压与冲击扰动下组合煤岩数值模型，以煤块水平位移、垂直加速度差值作为超低摩擦效应特征参数，分析围压、垂直冲击及水平冲击对特征参数的影响规律。研究结果表明：在垂直冲击与围压共同作用下，煤岩体残余位移及水平位移峰值随围压增大且呈指数增长趋势；在垂直冲击、水平冲击和围压三者共同作用下，煤岩体超低摩擦效应强度与作用时间都随着围压呈增加趋势；垂直冲击对组合煤岩超低摩擦效应的影响最为显著。
- 超低摩擦效应 /
- 煤岩组合块体 /
- 围压 /
- 垂直冲击 /
- 水平冲击 /
- 冲击地压
Abstract: The deep coal-rock combinations vibrate under the action of vertical disturbance. When the horizontal impact overcomes the friction resistance between blocks, it is very easy to produce ultra-low friction rock burst. In this paper, the combination block of fine sandstone-coal-fine sandstone is regarded as the research object. Considering the mining condition of the roof-coal-floor near the working face, numerical simulation method was used to establish the numerical block model under confining pressure and impact disturbance. The horizontal displacement and vertical acceleration difference value of coal block are defined as characteristic parameters of ultral-low friction effect. The influence of confining pressure, vertical impact and horizontal impact on the characteristic parameters are analyzed. The results show that the residual and horizontal displacement peaks increase exponentially with the increase of confining pressure under the interaction of vertical impact and confining pressure. And under the interaction of vertical and horizontal impacts and confining pressure, the strength and duration of ultra-low friction effect also increase with the increase of confining pressure. The vertical impact has the most significant effect on the ultra-low friction effect in coal-rock combination block.
- ultra-low friction effect /
- coal-rock combination block /
- confining pressure /
- vertical impact /
- horizontal impact /
- rock burst
注释:

责任编辑：吴芳

HTML全文

图 1 冲击能量力学转化形式

Figure 1. Mechanical transformation of impact energy

下载: 全尺寸图片幻灯片

图 2 数值模拟模型图

Figure 2. Diagram of the numerical simulation model

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图 3 数值模拟与已有实验对比

Figure 3. Comparison between numerical simulation and previous experiments

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图 4 围压与水平位移关系曲线

Figure 4. Curves of relation between confining pressure and horizontal displacement

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图 5 工作块体残余位移、水平位移峰值与围压关系曲线

Figure 5. Curves of residual displacement, horizontal displacement peak and confining pressure of the working block

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图 6 不同围压下垂直加速度差值变化曲线

Figure 6. Curves of vertical acceleration difference under different confining pressures

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图 7 冲击与残余位移关系曲线

Figure 7. Curves of impact and residual displacement

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图 8 冲击、围压与残余位移关系曲线

Figure 8. Curves of relation between impact, confining pressure and residual displacement

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图 9 垂直加速度差值与围压关系曲线

Figure 9. Curves of relation between difference of vertical acceleration and confining pressure

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表 1 模型力学参数

Table 1. Relevant mechanical parameters of the numerical simulation model

砂岩		煤
参数名称	取值	参数名称	取值
密度/(g/cm³)	2.80	密度/(g/cm³)	1.38
抗拉强度/MPa	11.12	抗拉强度/MPa	0.15
粘聚力/MPa	5.87	粘聚力/MPa	1.25
内摩擦角/(°)	53.05	内摩擦角/(°)	32.00
泊松比	0.11	泊松比	4.90
弹性模量/GPa	50.80	弹性模量/GPa	2.10

下载: 导出CSV

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