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Experimental study on energy storage and dissipation characteristics of granite under two-dimensional compression with constant confining pressure

二维等围压压缩下花岗岩的能量存储和耗散特征试验研究

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Abstract

To study the energy storage and dissipation characteristics of deep rock under two-dimensional compression with constant confining pressure, the single cyclic loading-unloading two-dimensional compression tests were performed on granite specimens with two height-to-width (H/W) ratios under five confining pressures. Three energy density parameters (input energy density, elastic energy density and dissipated energy density) in the axial and lateral directions of granite specimens under different confining pressures were calculated using the area integral method. The experimental results show that, for the specimens with a specific H/W ratio, these three energy density parameters in the axial and lateral directions increase nonlinearly with the confining pressure as quadratic polynomial functions. Under constant confining pressure compression, the linear energy storage law of granite specimens in the axial and lateral directions was founded. Using the linear energy storage law in different directions, the elastic energy density in various directions (axial elastic energy density, lateral elastic energy density and total elastic energy density) of granite under any specific confining pressures can be calculated. When the H/W ratio varies from 1:1 to 2:1, the lateral compression energy storage coefficient increases and the corresponding axial compression energy storage coefficient decreases, while the total compression energy storage coefficient is almost independent of the H/W ratio.

摘要

为了研究深部岩石在二维等围压压缩下的能量存储和耗散特征, 对两种高宽比(1:1和2:1)的长方体花岗岩试样进行了五种围压下的一次加卸载压缩试验。利用图形积分方式获得了试样在五种围压下的轴向和侧向的输入能密度、弹性能密度和耗散能密度的值。试验结果表明: 两种高宽比下试样的三种能量密度参数值随着围压的增加而非线性增加, 呈现二次多项式函数关系; 在二维等围压压缩下, 发现了轴向和侧向上的线性储能规律。根据轴向和侧向上的线性储能规律, 可以计算花岗岩在具体围压下轴向、侧向以及总的弹性能密度的值。此外, 当高宽比从1:1 增加到2:1 时, 侧向压缩储能系数增加, 相应的轴向压缩储能系数降低, 而总的压缩储能系数与高宽比无关。

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    You-qiang Su  (速佑强), Feng-qiang Gong  (宫凤强), Song Luo  (罗松) & Zhi-xiang Liu  (刘志祥)

  2. School of Civil Engineering, Southeast University, Nanjing, 211189, China

    Feng-qiang Gong  (宫凤强)

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  1. You-qiang Su  (速佑强)
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Correspondence to Feng-qiang Gong  (宫凤强).

Additional information

Foundation item

Projects(41877272, 51974359) supported by the National Natural Science Foundation of China

Contributors

GONG Feng-qiang provided the concept, developed the overarching research goal, and led the research activity planning and execution. GONG Feng-qiang also made great contribution to the improvement of manuscript after the initial draft finished. SU You-qiang conducted the experiments, analyzed the test data, and wrote the initial draft of the manuscript. LUO Song offers some valuable suggestions for the contents of the manuscript and edited the language of the manuscript. LIU Zhi-xiang reviewed and edited the manuscript. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

SU You-qiang, GONG Feng-qiang, LUO Song, and LIU Zhi-xiang declare that they have no conflict of interest.

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Su, Yq., Gong, Fq., Luo, S. et al. Experimental study on energy storage and dissipation characteristics of granite under two-dimensional compression with constant confining pressure. J. Cent. South Univ. 28, 848–865 (2021). https://doi.org/10.1007/s11771-021-4649-2

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  • DOI: https://doi.org/10.1007/s11771-021-4649-2

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