Experimental study on ultra-low friction effect at the interface of coal rock containing weak sandwich#br#
LI Liping1，YU Honghao1，ZHANG Haitao1，PAN Yishan2
(1. School of Mechanics and Engineering，Liaoning Technical University，Fuxin，Liaoning 123000，China；
2. School of Physics，Liaoning University，Shenyang，Liaoning 110036，China)
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.
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.
[1] 赵阳升，梁卫国，冯子军，等. 原位改性流体化采矿科学、技术与工程[J]. 煤炭学报，2021，46(1)：25–35.(ZHAO Yangsheng，LIANG Weiguo，FENG Zijun，et al. Science，technology and engineering of in-situ modified mining by fluidization[J]. Journal of China Coal Society，2021，46(1)：25–35.(in Chinese))
[2] 李利萍，李卫军，潘一山. 基于竖向位移差的块系岩体超低摩擦效应理论分析[J]. 煤炭学报，2019，44(7)：2 116–2 124.(LI Liping，LI Weijun，PAN Yishan. Theoretical analysis of anomalously low friction effect of block rock media based on vertical displacement difference[J]. Journal of China Coal Society，2019，44(7)：2 116–2 124.(in Chinese))
[3] 李利萍，李卫军，潘一山. 冲击扰动对超低摩擦型冲击地压影响分析[J]. 岩石力学与工程学报，2019，38(1)：111–120.(LI Liping，LI Weijun，PAN Yishan. Influence of impact disturbance on anomalously low friction rock bursts[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(1)：111–120.(in Chinese))
[4] KURLENYA M V，OPARIN V N，VOSTRIKOV V I. Pendulum-type waves. Part II：Experimental methods and main results of physical modeling[J]. Journal of Mining Science，1996，32(4)：245–273.
[5] KURLENYA M V，OPARIN V N，VOSTRIKOV V I. Effect of anomalously low friction in block media[J]. Journal of Applied Mechanics and Technical Physics，1999，40(6)：1 116–1 120.
[6] TARASOV B G，RANDOLPH M F. Frictionless shear at great depth and other paradoxes of hard rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2007，45(3)：316–328.
[7] RUTTER E H，HACKSTON A J，YEATMAN E. Reduction of friction on geological faults by weak-phase smearing[J]. Journal of Structural Geology，2013，51(1)：52–60.
[8] 钱七虎. 深部地下空间开发中的关键科学问题[C]// 钱七虎院士论文选集. 北京：科学出版社，2007：565–584.(QIAN Qihu. Key scientific issues in deep underground space development[C]// Selections from Academician Qian Qihu?s Theses. Beijing：Science Press，2007：565–584.(in Chinese))
[9] 何满潮，王 炀，刘冬桥，等. 基于二维数字图像相关技术的块系花岗岩超低摩擦效应实验研究[J]. 煤炭学报，2018，43(10)：2 732–2 740.(HE Manchao，WANG Yang，LIU Dongqiao，et al. Experimental study on ultra-ow friction effect of granite block based on two-dimensional digital image correlation technique[J]. Journal of China Coal Society，2018，43(10)：2 732–2 740.(in Chinese))
[10] 潘一山，王凯兴. 岩体间超低摩擦发生机制的摆型波理论[J]. 地震地质，2014，36(3)：833–844.(PAN Yishan，WANG Kaixing. Cycloidal wave theory of ultra-low friction between rock masses[J]. Seismology and Geology，2014，36(3)：833–844.(in Chinese))
[11] 王明洋，戚承志，钱七虎. 深部岩体块系介质变形与运动特性研究[J]. 岩石力学与工程学报，2005，24(16)：2 825–2 830.(WANG Mingyang，QI Chengzhi，QIAN Qihu. Study on deformation and motion characteristics of blocks in deep rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(16)：2 825–2 830.(in Chinese))
[12] 王明洋，周泽平，钱七虎. 深部岩体的构造和变形与破坏问题[J]. 岩石力学与工程学报，2006，25(3)：448–455.(WANG Mingyang，ZHOU Zeping，QIAN Qihu. Tectonic，deformation and failure problems of deep rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(3)：448–455.(in Chinese))
[13] 李 杰，王明洋，蒋海明，等. 爆炸与冲击中的非线性岩石力学问题(Ⅰ)：一维块系岩体波动特性的试验研究[J]. 岩石力学与工程学报，2018，37(1)：38–50.(LI Jie，WANG Mingyang，JIANG Haiming，et al. Nonlinear mechanical problems in rock explosion and shock. Part I：Experimental research on properties of one-dimensional wave propagation in block rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(1)：38–50.(in Chinese))
[14] 李 杰，蒋海明，王明洋，等. 爆炸与冲击中的非线性岩石力学问题(Ⅱ)：冲击扰动诱发岩块滑移的物理模拟试验[J]. 岩石力学与工程学报，2018，37(2)：291–301.(LI Jie，JIANG Haiming，WANG Mingyang，et al. Nonlinear mechanical problems in rock explosion and shock. Part II：Physical model test on sliding of rock blocks triggered by external disturbance[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(2)：291–301.(in Chinese))
[15] 蒋海明，李 杰，王明洋. 块系岩体滑移失稳中低摩擦效应的理论与试验研究[J]. 岩土力学，2019，40(4)：1 405–1 412.(JIANG Haiming，LI Jie，WANG Mingyang. Theoretical and experimental research on the low-friction effect in slip stability of blocky rock mass[J]. Rock and Soil Mechanics，2019，40(4)：1 405–1 412.(in Chinese))
[16] LIU D，LIN Y，WANG Y，et al. Experimental study on ultra-low friction effect of granite block under coupled static and dynamic loads[J]. Geotechnical and Geological Engineering，2020，38(16)：4 521–4 528.
[17] 李利萍，潘一山，鞠翔宇，等. 平均应力对超低摩擦型冲击地压影响试验研究[J]. 中国矿业大学学报，2020，49(1)：76–83.(LI Liping，PAN Yishan，JU Xiangyu，et al. Experimental study of the effect of meanstress on anomalously low friction rock burst[J]. Journal of China University of Mining and Technology，2020，49(1)：76–83.(in Chinese))
[18] 李利萍，潘一山. 深部煤岩超低摩擦效应能量特征试验研究[J]. 煤炭学报，2020，45(增1)：202–210.(LI Liping，PAN Yishan. Experimental research on energy characteristics of anomalously low friction effect in deep coal and rock mass[J]. Journal of China Coal Society，2020，45(Supp.1)：202–210.(in Chinese))
[19] 李利萍，唐 垒，潘一山，等. 基于FLAC–3D砂岩块体超低摩擦鞭梢效应研究[J]. 应用数学和力学，2022，43(3)：300–311.(LI Liping，TANG Lei，PAN Yishan，et al. Ultralow friction whipping effects of sandstone blocks based on FLAC–3D[J]. Applied Mathematics and Mechanics，2022，43(3)：300–311.(in Chinese))
[20] 李利萍，唐 垒，潘一山，等. 应力波扰动对砂岩块体超低摩擦效应影响分析[J]. 岩石力学与工程学报，2021，40(增1)：2 773–2 780. (LI Liping，TANG Lei，PAN Yishan，et al. Analysis of influence of stress wave disturbance on anomalously low friction effect in sandstone block[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(Supp.1)：2 773–2 780.(in Chinese))
[21] 李利萍，唐 垒，潘一山，等. 高宽比及应力波扰动对砂岩块体超低摩擦影响试验研究[J]. 岩石力学与工程学报，2022，41(7)：1 384–1 393.(LI Liping，TANG Lei，PAN Yishan，et al. Experimental study on effect of height-width ratio and stress wave disturbance on anomalously low friction of sandstone blocks[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(7)：1 384–1 393.(in Chinese))
[22] FAIRHURST C E，HUDSON J A. 单轴压缩试验测定完整岩石应力–应变全曲线ISRM建议方法草案[J]. 岩石力学与工程学报，2000，19(6)：802–808.(FAIRHURST C E，HUDSON J A. Draft ISRM recommended method for the determination of intact rock stress-strain full curve by uniaxial compression test[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(6)：802–808.(in Chinese))
[23] 吴 昊，方 秦，张亚栋，等. 一维块系地质块体波动特性的试验和理论研究[J]. 岩土工程学报，2010，32(4)：600–611.(WU Hao，FANG Qin，ZHANG Yadong，et al. Experimental and theoretical study on wave characteristics of one-dimensional block geological blocks[J]. Chinese Journal of Geotechnical Engineering，2010，32(4)：600–611.(in Chinese))
[24] 王洪亮，葛 涛，王德荣，等. 块系岩体动力特性理论与实验对比分析[J]. 岩石力学与工程学报，2007，26(5)：951–958.(WANG Hongliang，GE Tao，WANG Derong，et al. Comparative analysis of dynamic characteristics of block rock mass by theory and experiment[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(5)：951–958.(in Chinese))
[25] 何满潮，刘冬桥，宫伟力，等. 冲击岩爆试验系统研发及试验[J]. 岩石力学与工程学报，2014，33(9)：1 729–1 739.(HE Manchao，LIU Dongqiao，GONG Weili，et al. Development of a testing system for impact rockbursts[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(9)：1 729–1 739.(in Chinese))
2023, Vol. 42 
