变刚度加载试验系统的研制及其在煤岩破坏力学行为测试中的应用

doi:10.13722/j.cnki.jrme.2021.1323

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摘要矿山煤层与顶底板岩层具有不同的组合赋存形式，考虑围岩结构刚度差异性的煤岩力学行为试验研究可为揭示冲击地压机制提供一种新的探索方式。介绍了自主研发的一套变刚度加载岩石力学试验系统，该试验系统的主体试验机为内外框架组合式结构，利用加载刚度伺服调控系统控制内框架能量储存，实现加载刚度调控的目的。利用该试验系统进行了3种加载刚度下砂岩试件的力学行为测试，研究表明：加载刚度对砂岩试件单轴抗压强度和弹性模量基本无影响；随着加载刚度的减小，砂岩应力‐应变峰后曲线由台阶状变为光滑斜线型，峰后应力降速度增大，且与加载刚度呈幂函数关系；试件破坏时试验机框架发生多次瞬时高速回弹行为，瞬时回弹速度极值及时长占比随加载刚度的减小而增大，回弹速度均值、总回弹量与加载刚度呈幂函数关系；加载刚度对试件峰后破裂耗散能影响较小，与试验机应变能释放量呈幂函数关系。所研发的变刚度加载试验系统为不同刚度组合下煤岩力学行为测试提供了新的试验装备。

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	赵同彬1
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	尹延春1
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	谭云亮1
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	邢明录1
	汤兴学1
	李春林3

关键词 ：采矿工程, 冲击地压, 试验系统, 加载刚度, 力学行为

Abstract：The combinations and occurrence forms of coal seams and roof and floor strata are diverse. In laboratory study of the failure and deformation behavior of coal and rock，the stiffness differences of the roadway surrounding rock structures should be taken into account，which may provide a new method to reveal coal bump mechanism. This paper introduced a self-developed rock testing system with changeable stiffness. The main testing machine of this system is a combined structure of inner and outer frames. The change in the loading stiffness is achieved by using a stiffness servo control system to control the energy accumulation in the inner frame. The tests of the sandstone specimens under three different loading stiffnesses in the testing system show that the loading stiffness does not significantly affect either the uniaxial compressive strength or the Young?s modulus of the rock. However，the post-peak stress-strain curve of the rock becomes smoother and steeper when the loading stiffness decreases，and the stress drop rate increases. It is shown that the stress drop rate has a power function correlation with the loading stiffness. After the peak load，the inner frame of the testing system rebounds several times in high speeds. The magnitude of the instantaneous rebound speed and the rebound duration increase with the decrease of the loading stiffness. Both the mean rebound velocity and the total rebound deformation have power function correlations with the loading stiffness. The loading stiffness has little effect on the post-peak dissipated energy of the specimen，and has a power function relationship with the released energy of the testing machine. The rock testing system with changeable stiffness provides a new kind of testing equipment and technology for rock mechanical behavior testing under different loading stiffness combinations.

Key words： mining engineering coal bump testing system loading stiffness mechanical behavior

引用本文:

赵同彬1，2，尹延春1，2，谭云亮1，2，邢明录1，汤兴学1，李春林3. 变刚度加载试验系统的研制及其在煤岩破坏力学行为测试中的应用[J]. 岩石力学与工程学报, 2022, 41(9): 1846-1857.
ZHAO Tongbin1，2，YIN Yanchun1，2，TAN Yunliang1，2，XING Minglu1，TANG Xingxue1，LI Charlie Chunlin3. Development of a rock testing system with changeable stiffness and its application in the study on the rock failure mechanical behavior . , 2022, 41(9): 1846-1857.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1323 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I9/1846

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