高宽比及应力波扰动对砂岩块体超低摩擦影响试验研究

doi:10.13722/j.cnki.jrme.2021.0973

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摘要为揭示层状岩体在应力波扰动作用下岩块尺寸对超低摩擦型冲击地压影响机制，以沈阳红阳三矿顶板砂岩块体为研究对象，将5个块体上下依次叠放置于自主研制块系岩体超低摩擦试验装置加载腔内，始终以中间块体为工作块体，用不同工作块体的高宽比Hs/Hw(0.8～2.0)模拟不同构造层次或同一构造层次不同破碎程度的岩体，通过对块系模型系统施加应力波扰动Pv(频率0～10 Hz、振幅0～1 MPa)模拟爆破、顶板断裂、集中开采等扰动作用，施加轴压Fv和水平冲击Fh分别模拟岩体上覆岩层压力和顶板断裂冲击作用，开展应力波扰动作用下高宽比不同的砂岩块体超低摩擦试验。以高宽比作为反映岩块尺寸的表征指标，以应力波扰动频率和振幅作为反映扰动作用的表征指标，以工作块体水平位移作为超低摩擦效应强度的表征指标，分析得到轴压、应力波扰动及水平冲击组合作用下高宽比及应力波扰动对砂岩工作块体的超低摩擦效应强度影响规律与能量演化特征。研究结果表明：应力波扰动、轴压及水平冲击作用一定时，工作块体水平位移随其高宽比增大而呈递减趋势，即越趋破碎的岩体在相同应力环境下产生超低摩擦效应强度越大；高宽比一定时，工作块体水平位移随应力波扰动频率增加呈先增后减变化、随应力波扰动振幅增加而增加；不同试验工况下，工作块体单位质量动能及功率谱密度最大值均随高宽比减小而逐渐增大，高宽比为0.8时工作块体所携带动能最大，超低摩擦效应强度相对较大。

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	李利萍1
	唐垒1
	潘一山2
	鞠翔宇1
	张海涛1

关键词 ：岩石力学, 砂岩块体, 应力波扰动, 超低摩擦效应, 高宽比

Abstract：To reveal the layered rock mass under the action of stress wave disturbance，the rock type size of anomalously low friction mechanism of impact ground pressure influence，five blocks of Shenyang red Yang coal mine roof sandstone were stacked up and down in the loaded cavity of an anomalously low friction testing device. The middle of the block to block was always the working block. The Hs/Hw(0.8–2.0) of different working blocks was used to simulate rock masses of different structural levels or different degrees of fragmentation in the same structural level. The disturbance effects of blasting，roof fracture and concentrated mining were simulated by applying stress wave disturbance Pv(frequency 0–10 Hz，amplitude 0–1 MPa) to the block model system. Axial compression Fv and horizontal impact Fh were applied to simulate the impact of overburden pressure and roof fracture respectively，and the anomalously low friction tests of sandstone blocks with different height-width ratios were carried out under stress wave disturbance. With the height-width ratio as the representation index reflecting the size of the rock block，the disturbance frequency and amplitude of the stress wave as the representation index reflecting the disturbance effect，and the horizontal displacement of the working block as the representation index reflecting the intensity of anomalously low friction effect. The effects of height-width ratio and stress wave disturbance on anomalously low friction intensity and energy evolution characteristics of sandstone working block under the combined action of axial compression，stress wave disturbance and horizontal impact are analyzed. The results show that when the stress wave disturbance，the axial compression and the horizontal impact are constant，the horizontal displacement of the working block decreases with the increase of its height-width ratio，i.e.，the more fractured rock mass under the same stress environment，the greater the intensity of anomalously low friction effect. When the height-width ratio is constant，the horizontal displacement of the working block increases first and then decreases with the increase of stress wave disturbance frequency，and increases with the increase of stress wave disturbance amplitude. Under different test conditions，the maximum kinetic energy per unit mass and power spectral density of the working block increase gradually with the decrease of the height-width ratio. When the height-width ratio is 0.8，the kinetic energy carried by the working block is the maximum，and the intensity of the anomalously low friction effect is relatively large.

Key words： rock mechanics sandstone blocks stress wave disturbance anomalously low friction effect height-width ratio

引用本文:

李利萍1，唐垒1，潘一山2，鞠翔宇1，张海涛1. 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): 1384-1393.
LI Liping1，TANG Lei1，PAN Yishan2，JU Xiangyu1，ZHANG Haitao1. Experimental study on effect of height-width ratio and stress wave disturbance on anomalously low friction of sandstone blocks . , 2022, 41(7): 1384-1393.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0973 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I7/1384

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