含软弱夹层煤岩界面超低摩擦效应试验研究

doi:10.13722/j.cnki.jrme.2022.0978

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摘要为揭示动载扰动作用下煤岩界面软弱夹层特性对超低摩擦型冲击地压影响机制，采用自制煤岩界面超低摩擦试验装置，以沈阳红阳三矿煤层和砂岩顶底板为研究对象，将煤粒、砂岩粒和煤砂粒铺置于煤岩界面，通过改变软弱夹层介质、厚度、粒径模拟不同软弱夹层特性，以煤块为工作块体，利用其水平位移表征超低摩擦效应强度，进行煤岩界面不同软弱夹层特性对煤岩块体超低摩擦效应影响试验。研究结果表明：(1) 垂直扰动幅值与超低摩擦效应强度呈线性增加关系。垂直扰动频率与超低摩擦效应强度间关系存在显著影响区。煤岩界面无软弱夹层时，垂直扰动频率为1～4 Hz时存在显著影响区；煤岩界面含软弱夹层时，垂直扰动频率为1～6 Hz时存在显著影响区。显著影响区范围内煤岩界面更易发生超低摩擦效应。(2) 垂直冲击扰动频率和幅值一定时，含软弱夹层煤岩界面发生超低摩擦效应强度分别为干摩擦和胶结煤岩界面的2.25和8.84倍。煤岩界面含煤粒、砂粒和煤砂粒软弱夹层时，随扰动幅值增加超低摩擦效应强度平均增幅分别为33.5%，57.1%，42.4%。(3) 煤岩界面含软弱夹层、夹层厚度(5 mm)越大、夹层粒径(20～35目)越小时，煤岩界面更易发生超低摩擦效应。(4) 结合红阳三矿超低摩擦型冲击地压事故实例分析，表明含软弱夹层煤岩界面更易发生煤体失稳，从而诱发超低摩擦型冲击地压。

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	李利萍1
	余泓浩1
	张海涛1
	潘一山2

关键词 ：岩石力学, 煤岩界面, 软弱夹层, 超低摩擦效应, 煤岩块体

Abstract：In order to reveal the influence mechanism of soft interlayer characteristics of coal-rock on ultra-low friction impact ground pressure，the self-made coal-rock interface ultra-low friction test device was adopted，and the coal particles，sandstone particles and coal sand grains were laid at the coal-rock interface by changing the soft interlayer medium，thickness and particle size，and the coal block was used as the working block to characterize the ultra-low friction effect strength by using its horizontal displacement. The influence of different soft interlayer characteristics at the coal-rock interface on the ultra-low friction effect of the coal-rock block was tested. The results of the study show that the vertical disturbance amplitude increases linearly with the strength of ultra-low friction effect. There is a significant influence zone in the relationship between vertical disturbance frequency and ultra-low friction effect influencing. When there is no soft interlayer at the coal rock interface，there is a significant influence zone when the vertical disturbance frequency is 1–4 Hz. When the coal-rock interface contains a soft interlayer，there is a significant influence zone when the vertical disturbance frequency is 1–6 Hz. The coal-rock interface within the significant influence area is more prone to ultra-low friction effect. When the vertical impact disturbance frequency and amplitude are fixed，the ultra-low friction effect occurs at the interface of the coal rock containing the soft sandwich layer，and the strength is 2.25 times and 8.84 times that of the interface of dry friction and cemented coal rock，respectively. When the coal-rock interface contains coal particles，sand grains and soft interlayers of coal sand grains，the average increases of ultra-low friction effect intensity with the increase of disturbance amplitude are 33.5%，57.1% and 42.4%，respectively. The coal rock interface contains a soft interlayer，the larger the thickness of the sandwich(5 mm)，the smaller the particle size(20–35 mesh)，the more prone to ultra-low friction effect at the coal rock interface. Combined with the case analysis of ultra-low friction impact ground pressure accident of Hongyang Three Mines，it is shown that the interface of coal rock with soft sandwich is more prone to coal body instability，thereby inducing ultra-low friction impact ground pressure.

Key words： rock mechanics coal rock interface weak sandwich ultra-low friction effect coal rock blocks

引用本文:

李利萍1，余泓浩1，张海涛1，潘一山2. 含软弱夹层煤岩界面超低摩擦效应试验研究[J]. 岩石力学与工程学报, 2023, 42(7): 1638-1649.
LI Liping1，YU Honghao1，ZHANG Haitao1，PAN Yishan2. Experimental study on ultra-low friction effect at the interface of coal rock containing weak sandwich#br#. , 2023, 42(7): 1638-1649.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0978 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I7/1638

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