强冲击倾向性顶板岩样孔洞充填力学特性及能量调控演化机制

doi:10.13722/j.cnki.jrme.2020.0531

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摘要针对冲击地压形成机制的复杂性且易导致无法准确有效预防冲击地压发生的问题，为研究采动作用下强冲击倾向性岩层能量调控机制，开展孔洞充填岩样岩石力学实验，分析不同充填状态下岩样能量演化机制与破坏模式，揭示强冲击倾向性顶板岩样孔洞充填调控能量演化机制。结果表明：相比于未钻孔完整状态岩样，钻孔未充填状态岩样、钻孔充填铜管状态岩样(刚性充填)及钻孔充填固化体(柔性充填)状态岩样力学参数均有所劣化。不同充填状态下岩样能量演化规律大致与未钻孔完整状态下岩样相同，但在屈服破坏阶段以及破坏后期阶段均存在明显差异。由于钻孔的存在，加剧了岩样的初始损伤，对于钻孔充填钢管状态，岩样吸收的总应变能提高，而对于钻孔充填固化体状态，不仅提高了岩样的强度，还改变了岩样的强脆性特征。同此构建充填改性能量转化效率，通过计算能量转化效率，进一步说明“先释放+后吸收”能量调控机制。最后对比分析不同充填状态下岩样冲击倾向性排序，发现钻孔充填铜管和钻孔充填固化体均能更好地降低冲击地压发生程度，且钻孔充填固化体效果优于钻孔充填铜管，但需重点关注钻孔充填固化体状态下发生应变增大特征，对于工程环境中的大变形环境，同样易发生灾害。

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	崔峰1
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	张帅1
	来兴平1
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	方贤威1
	董帅1

关键词 ：采矿工程, 强冲击倾向性, 孔洞, 充填, 力学性质, 能量调控, 破坏模式

Abstract：In view of the complexity of the formation mechanism of rockbursts and the problem that it is difficult to prevent the occurrence of rockbursts accurately and effectively，rock mechanics experiments of rock samples with a filled cavity were performed to analyze the energy evolution mechanism and failure mode of the rock samples under different filling conditions and to reveal the energy regulation evolution mechanism of the hole filling of the rock samples with strong impact tendency. The results show that compared with undrilled intact rock samples，the mechanical parameters of rock samples with an unfilled，copper tube-filled(rigid filling) or solidified body-filled(flexible filling) borehole are deteriorated. The energy evolution law of the rock samples under different filling conditions is roughly the same as that of the intact rock samples except for in the yield failure and failure stages. Due to the existence of boreholes，the initial damage of the rock samples is aggravated. Filling cooper pipe increases the total strain energy absorbed by the rock samples，while filling consolidation body not only improves the strength of the rock samples but also changes the strong and brittle characteristics of the rock samples. The filling modified energy conversion efficiency was constructed，and the energy regulation mechanism of“first release + then absorption”was further explained by calculating the energy conversion efficiency. Finally，the sequence of impact tendency of the rock samples under different filling conditions was compared and analyzed，and it was found that drilling filling copper pipe and solidified body can better reduce the degree of rock burst and the latter is better than the former. However，it is necessary to pay attention to strain increase behavior under the solidified body-filled condition，which possibly results in disasters under large deformation environment.

Key words： mining engineering strong brusting liability hole filling mechanical properties energy regulation failure mode

引用本文:

崔峰1，2，3，张帅1，来兴平1，2，方贤威1，董帅1. 强冲击倾向性顶板岩样孔洞充填力学特性及能量调控演化机制[J]. 岩石力学与工程学报, 2020, 39(12): 2439-2450.
CUI Feng1，2，3，ZHANG Shuai1，LAI Xingping1，2，FANG Xianwei1，DONG Shuai1. Mechanical characteristics and energy regulation evolution mechanisms of cavity filling of rock samples from roof with strong brusting liability. , 2020, 39(12): 2439-2450.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0531 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I12/2439

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